Servo ball valve

Servo ball valve

com NEED HELP? Call our knowledgeable customer service at 1-800-800-BRAY (2729) Philmac’s Australian made Mark II servo tank filling valve is designed to deliver high volumes of water very quickly. Inadequate metering of 2nd gear band servo release oil causes 3-4 clutch failure. Blade Positioning. 3D Print: Make Servo Controlled Valves: Small and reliable servo controlled valves can be easily 3d printed. This happened to be right around In fact, most globe control valve designs can be changed from linear to equal percentage (and vice versa) by changing the trim. USSOLID Motorized Ball Valve- 1/4” Stainless Steel Electrical Ball Valve with Full Port, 9-24 V AC/DC, 2 Wire Auto Return U. ball valves, dampers, plug valves, louver valves, etc. 6. Shaft coupling and mounting patterns are compatible with 8 servo motor series from 5 manufacturers. A ball valve is a valve with a spherical disc, the part of the valve which controls the flow through it. makecourse. The valve offers a spool position feedback signal that can be used for system Jul 5, 2016 Servo valves are for controlling the flow of fluid (water, gas, etc. That is particularly true in terms of its dynamic properties. It is mainly used to hot-dip galvanizing plant. When coupled with a solenoid, pneumatic actuators also can produce torque to move cylinders or enough torque to trigger small electric devices. Servovalve is a company specialised in design and production of hydraulic and pneumatic actuators for industrial valves. The sphere has a hole, or port, through the middle so that when the port is in line with both ends of the valve, flow will occur. The system works similar to their split valve technology - eg. valve either to control a ICS or PM main valve or as a separate pneumatic valve mounted in a CVH housing. Description 1a V600 Housing for VA800 series 1b V700 Housing for VA900 series 2 V601 Valve spool V601C 3 V570-50-1 Valve input shaft V570-50-2 V570-50-2C V570-55 Proportional Ball Valves? 0-10VDC to Valve and 0-10VDC Feedback. Build, view, and order actuated ball, butterfly, plug valves, and flow meters online. They are suitable for controlling air or water and all kinds of robot projects. And, of course, you can call us at 800-325-4774. Moog Mechanical Feedback Servo Valves incorporate a feedback Raven System Components. They are quarter-turn valves that consist of a central sphere inside a valve. The servo valve, in part, consists of a torque motor, flapper, spool and feedback mechanism. Compare all actuated 2-way ball valve types and select the series right for your application. You have been signed out due to in-activity the last 120 minutes. Due to the unique servo action, the valve requires only a small float, which makes them ideal for confined spaces. Ball valves. When the active valve is closed, it forms a near-flush surface into the process equipment. Parker is fully committed to complying with international standards. Similar to the Rod and Guided Rod type except utilizes an AC servo motor instead of a DC type. Founded in 1994, A-T Controls currently operates out of the primary facility in Cincinnati, Ohio and another in Stafford, Texas with several sales offices throughout North America. The valve action is pretty stiff so I opted for a hi-torque (200+ oz-in) Savox IP67 waterproof servo. Not to mention, we have a very quick turnaround on servo & proportional valve repairs. A servo and ball valve might cost $10. Valworx motor operated valves use an electric motor driven gear box to open and close the valve. Leads times and pricing may vary between manufacturers. ) You can also adjust the model for your own servo + valve. They The servo valve in Figure 4. 618-793-2744 Spray Parts Warehouse The servo valve and its qualities largely determine the behaviour of the drive. The feedback mechanism can last well above 1 billion cycles. Servo directional valves are 4-way, 3-position spool valves with all ports blocked in the center position. To hold these kinds of tolerances requires more than a go, no-go hydraulic control valve. Valve types include actuated ball valves and butterfly valves Order Pneumatic valves and valve manifolds online now from Festo! Servo motors and drives. Solid: Ball Valves - Amazon. 4 to 250), Siemens 599 Series Ball Valves can control hot or chilled water and up to 50% glycol solution in convectors, fan coil units, unit conditioners, radiation, and reheat coils. Motorized ball valves are a reliable and economical automated valve solution. route but I just don’t have the fab shop to make nice brackets to mount servo to Ball valve. Electric   Another option is insulating the servo and heating it to maintain a desired If you want it to be fail safe using a ball valve, use a single-acting  19723 products China Servo Valve manufacturers - Select 2019 high quality Servo Valve J2039 Brass Male Screw Leakproof Gas Ball Valve Servo with Mouth  Jun 13, 2007 As explained in the March 2006 issue (Choosing the right valve, pg. Rgds Bundor valve is located in jinan area, tianjin city, is a collection of scientific research, design, production, sales and after-sales service as one of the professional valve manufacturers, its main export port is tianjin port. Hanbay Inc. Since 2004, Hanbay's advanced, precise and miniature valve actuators have modernized the electric valve actuator market. And because the system is closed-loop, feedback is directed to the servo valve. My plan is to connect a cheap cordless drill motor (9v) to a ball valve, then use an Arduino to tell the motor to do quarter-turns to open and close the valve. Air-Operated Diaphragm Valves and Globe Valves-Perhaps your application requires more rapid shut-off, or you want to use line pressure to open the valve, or have other reasons you don't specifically want a ball valve. Choose from our wide variety of valves in all different sizes and materials for use in water, gas, air and even diesel applications. I then rewired the servo to use a 7. Servo, Flow, 3 Boom Connectors For Ball Valves. Pressure Control. An electronically controlled proportioning valve (ECV) will take an electrical input signal (usually 4 to 20 mA) and proportion the amount of flow through a pipe from fully Read More. Our hydraulic valves comply with ISO, CSA, and CE standards, and we offer directional control and servo valves that are ATEX rated. Moog 651-106 Servo Proportional Hydraulic Valve See more like this. The AC servo motor enables higher speed and acceleration, as well as improved vertical load capability. . The company was established in 1976 and, since its birth, has designed and produced standard and special actuators for every kind of valve, for severe and heavy duty service and for every environmental conditions. Our modular product line of valves, actuators and accessories offer the best compatibility, economy and quality performance in the flow control industry. The 3-4 clutch and 2nd gear band are not properly synchronized. China Servo Valve manufacturers - Select 2019 high quality Servo Valve products in best price from certified Chinese Valve manufacturers, China Servo suppliers, wholesalers and factory on Made-in-China. Bürkert 8804- Ball Valve with Electric Rotary Actuator · Bürkert 8802YG Bürkert 5282- 2/2-way Solenoid Valve with Servo Diaphragm · Bürkert 6519 3/2, 5/2,  Used Valves, Control, Servo, Hydraulic, Pneumatic, For Sale and Pneumatic Devices for Sale - A-T Controls Series 88 Direct Mount Stainless Ball Valve. To learn more about PSI’s servo valve repair capabilities, refer to our Servo Valve Repair Line Sheet, or enter the part/model number, manufacturer, or component type in the search box at the top of the page. 1 4 turn shut off valve - Neles jamesbury butterfly valve - Valve manufacturers in mumbai 1 4 TURN SHUT OFF VALVE What is a servo valve. I used an off-the-shelf 1/4" female NPT valve from Lowes, item #369194. The screws are Moog Hydraulic Servo Valve MODEL G771K241A (NEW) unused,in box with paper work. S. This product has variations available for quick shipping. This is a quick prototype of a system that proportionally regulates air pressure for an array of 9 air holes. One day a co-worker of mine asked me if I knew of a way to control an irrigation system from a smartphone or computer. The servo valve plays a critical role in the performance of a hydraulic positioning, velocity or pressure control application. At 4. . Supplier of high quality solenoid valves for professional use and even small projects. I am trying to build a servo-controlled water valve. We offer valves from ¼″ to 5″, steel and poly and control choices from analog to CAN, and home made water valve controlled by a servo and an arduino. 436 ill no. To achieve the highest performance in industrial hydraulic systems, every component is critical. About 12% of these are valves, 8% are wood router, and 5% are hydraulic parts. The term servovalve describes a valve design with bushing spool assembly, characterized by high precision metering edges. Improved design meters servo release oil, reducing 3-4 clutch failure Electric Actuators from Exlar deliver a range of capabilities, power, and performance in both linear and rotary configurations unmatched by other systems. ” Description: 2/2-way solenoid valve of nominal diameter DN 10 for use with cold and heated potable water and physically and chemically similar media. The LEFS is available in a motorless type, permitting the mounting of an AC servo motor other than the standard chosen by SMC. That’s why companies all over the world rely on Eaton industrial valves to provide continuous reliable performance across the full spectrum of industrial applications. No Speed Or Run/Hold A/R A/R 8160 CONTROL SYSTEM 8160 WIRING S E C 1 Ball Valves Hydraulic ball valves control the flow of fluid. Sure, there are many actuated valves available on the market, but it is hard to find actuators that c Servo Valves From primary metal, wood and paper processing to plastics, manufacturing and more, SX4 servo valves from Eaton are the perfect solution for closed-loop control applications. Flow-Tek Ball Valve Selection Guide Download Ball Valves; Control Valves; Globe Valves; Servo Plus; Servo Plus II ; Series LS --Limit Stops-- For use with actuated ball valves. DQF electric ball valve and ball valve assembly from the O-Series Electric Actuators DRQJ compositio DQF electric ball valve and ball valve assembly from the O-Series Electric Actuators DRQJ composition. It's easy to get cheap solenoid valves like the on. The electric valve actuator is characterized with small size, light weight, simple and compact structure,  Shop our selection of gas valve kits in different styles—from simple key valves 1/2'' Quarter Turn Straight Gas Ball Valve Kit, Chrome - (CP-BVS-CR-B) - Dante. To make use of this thing you will need to find exactly the servo and valve I used ( TowerPro  175 Items Process control valves including solenoid valves, ball valves, butterfly valves, knife gate & gate valves, check, globe, Valve Operation Servo Assisted IGLOO ball valves are manually- or servo- operated shut-off valves suitable for bi- directional flow, designed to be used in liquid, suction and hot gas lines in  Servo Plus II Ball Valves · 3-Piece Valves · Triad Series · Tank Series · Media Containment Unit · Triad Series HP · Series 5000/6000 · Series 7000/8000. Extending Servo Valve Performance . Can anyone recommend a suitable 1/4-turn valve, either ceramic, ball valve, or anything else that is easy to turn, even under pressure? It must require very little torque to turn, so a standard servo can rotate it with a small lever attached. Servovalves and Servo-Proportional Valves are electrohydraulic, continuously acting valves that transform a changing analog or digital input signal into a stepless hydraulic output (flow or pressure). Burkert Type 6211 Servo-Assisted Solenoid Valves for Liquids Burkert Type 6211 is a servo-assisted normally closed 2/2-way solenoid valve with a servo-diaphragm, media separated, for use especially with neutral fluids and gaseous media. This allows for a greater flow and makes them ideally suited to applications such as filling fire water tanks I am trying to build a servo-controlled water valve. The k v/C v value is measured with the Sonnax servo release check valve kit 77701-076 is a unique solution that combines an orifice with a ball check valve to resolve these problems. A wide variety of servo motor ball valve options are available to you, such as ball, control, and butterfly. To maximize machine operation and business results, engineers ought to consider more than how a servo valve performs with regard to flow/pressure gain, frequency response, and precision. Alibaba. Star servo valves are doing many billions of cycles without the need for repair. First, torque on the ball valve is quite variable because they have a rubber seal around the ball and it gets stiff with age and lack of use. + Items in search results Electric 3way 1Inch Ball Valve KZQ11 Positioner Servo Controller 0-10V In Out Electric actuated ball valves use a motor driven electric actuator to rotate the ball valve 90° to change the flow pattern. 2V 3000mA car battery pack. Part no. com FREE DELIVERY possible on eligible purchases Waterproof Motorized Valve Solutions for Your Application. Available in stainless steel, brass, and PVC, these 2-way and 3-way actuated valves are widely used for valve automation. However, that can only be achieved with extremely short control distances of a few tenths of millimetres. description years qty part no Are you looking for more information about Ball valve actuator unit VZPR and its quality features? Find the right product type and order online easily from Festo! Servo parts list (applies to inline servos and servos mounted to HE and HL racks) Dwg. Max pressure 150 psi , valve size 1/2". I have even broken the handle on a few. 2 bar g (2. Atex solenoid valves Actuated ball valve and actuated butterfly valve options from Grainger help automate the starting and stopping of flows. “Contamination the customer can control, Feedback ball erosion we can control. Parker manually, pneumatically, and electrically actuated two-way B Series Ball Valves provide quick 1/4 turn on-off control of fluids utilized in process and instrumentation applications. The HEC2003/2004 Series Servo System features a high response servo valve, a manifold mounted fi lter, and three different mechanical mounting options. Apr 22, 2013 scheme of the power head axial servo loading test system including the 1- Level 2- level relay 3- thermal resistance 4- air filter 5- ball valve 6-  SUN hydraulics proportional valves fit the unique Sun cavity. The AC servo motor enables   063-0172-175, 3/4" STAINLESS STEEL CONTROL VALVE (STAINLESS STEEL BALL). com offers 130 servo motor ball valve products. Here, pilot pressure is applied to both ends of the main spool and linked by orifices to small jets playing to a flapper which can be moved by the electrical control signal. CVPP (LP) CVPP (HP) Weights are approximate values only MWP: Maximum working pressure. Servo, Flow, Run/Hold And 1 Boom Connection For A Single 628140 Ball Valve A/R A/R A/R 4 5 38817002 38811009 8160 NH3 Strip-Till Harness Inc. Series SW --Limit Switches-- For use with actuated ball valves. RAVEN 063-0172-175, 3/4" STAINLESS STEEL CONTROL VALVE  This part combines an orifice with a ball check valve to meter servo release oil. Electric actuators used in pressure control. Engineers across a wide range of industries continue to trust KZValve for electric valve actuation. 9 psi g). Ball Valves and Valve Actuators With line sizes ranging from ½” to 2” sizes (Cv ranging from 0. Air test the rectangular circuit, 5 openings in from EPC solenoid. We did some research and quickly found that it was very expensive to purchase a system with this capability, so we wondered if we could build it. Session expired. There are 3,179 servo ball valve suppliers, mainly located in Asia. com). Dump Valves. Actuated 1/2" PVC Ball Valve: This instructable was created in fulfillment of the project requirement of the Makecourse at the University of South Florida (www. I have only seen ones that operate on 120 volts AC. That worked much better! The valve now opens and closes in less than 0. No cross leakage should be visible! Look for bore wear at the forward modulation valve (37947-11K) This valve controls the servo apply rate. The lowest priced one on Ebay is currently $119. And whether servo ball valve is solenoid, manual, or pneumatic. 2-way and 3-way motor operated valves are available in brass, stainless steel, and pvc. Contact a supplier or the parent  AC Servo Sliders – Ball Screw Drive. EMIDs convert electric signals into mechanical power by manipulating fluid flow. Find your servo-driven valve easily amongst the 32 products from the leading brands (VUOTOTECNICA, JACOB DOSATEC, MOOG, ) on DirectIndustry, the industry specialist for your professional purchases. If Actuated Valves, Manual Valves and Flow Meters by Assured Automation. P-band for a valve system regulated by CVPP and ICS or PM main valve: <0. The drivers are pulse input type, with both incremental and absolute encoder options and 17- or 18-bit resolution. Typically used for ON/OFF control of water, air, oil and other compatible media. A-T Controls, Inc. Great idea, low power consumption (5V, 50mA, 5 seconds to fully open or  2-way, 3-way, 4-way High Pressure Ball Valves – BV Series · Configure Product. 5 seconds and seems very strong. 30), servo- proportional valve characteristics can have a huge effect on the . Servo Valves. This thing lets you make a working servo valve from a hobby servo and a plumbing valve! A servo and ball valve might cost $10. The manifold can feature either SAE or metric straight thread ports and an optional ball valve with a locking handle. To make use of this thing you will need to find exactly the servo and valve I used (TowerPro MG995 and DAHL 0176, respectively. Save servo ball valve to get e-mail alerts and updates on your eBay Feed. Servo valves are part of the Honeywell family of Electro Mechanical Interface Devices (EMIDs) which includes the electro-hydraulic servo valve (EHSV), fueldraulic servo valve, torque motor, pneumatic torque motor as well as solenoids. So here is the system sometimes including amplifiers, feedback from agencies, implementing agencies, such as fault, sometimes it is the issue of servo valve. Contact us if you're interested in or in need of a repair on your CEI servo valve. Solenoid control valves that change valve position Open/Close etc by direct movment from a solenoid are called Direct Acting. This page is just a snapshot of the valves we carry and that are on the market. Find Ball Valve Electric Actuators related suppliers, manufacturers, products and specifications on GlobalSpec - a trusted source of Ball Valve Electric Actuators information. Proportional media valve. LewanSoul LX-16A Full Metal Gear Serial Bus Servo Robotic Servo with 17kg High Torque, Real-Time Feedback of Position Voltage Temperature, Dual Ball Bearing for RC Robot Arm(Control Angle 240) Hi all, I'm a homebrewer (beer) looking to automate the bottle-filling process. The top supplying country is China (Mainland), which supply 100% of servo ball valve respectively. Explore our range online. This feedback enables the servo valve to generate a more accurate response to the received command Ready for the refrigerants of the future. Solid Motorized Ball Valve: Full Hydravalve (UK) Ltd is an ISO approved provider of valves, pneumatic actuators, electric actuators, temperature gauges, ancillary equipment, industrial hose equipment and brass fittings. KZValve practically eliminates the chance of actuator failure due to water intrusion. This product is externally monitored and designed for two channel safety architecture up to Category 4, Performance level e. Indirect operated (servo or pilot operated) Indirect operated solenoid valves (also called servo operated, or pilot operated) use the differential pressure of the medium over the valve ports to open and close. STEP 2: Remove transmission filter. The unique design of the secondary servo action guarantees shut off at extremely high pressure. no. Introduction to Electro-hydraulic Proportional and Servo Valves 1. The third type of hydraulic directional control technology is the servo valve. If you print this Thing and display it in public proudly give attribution by printing and displaying this tag. 5 million free CAD files from the largest collection of professional designers, engineers, manufacturers, and students on the planet. Servo valves are not a new technology as servo valves were first used in the 1940s. Today, Hanbay is at the forefront of the valve automation industry, manufacturing electric valve actuators that can be used in any application. The goal is to haptically convey data so that the visually impaired can "feel" the Buy Motorized Ball Valve- 1/2" Brass Electrical Ball Valve with Full Port, 9-24V AC/DC and 3 Wire Setup by U. Sonnax servo release check valve kit 77701-076 is a unique solution that combines an orifice with a ball check valve to resolve these problems. Powered by 220V power supply, the use of high-quality reversible servo motor as a power sourc Letting us repair your valve can also be drastically cheaper than replacing it, especially if parts are hard to come by. Therefore, frequencies over 150 Hz can be expected from a servo valve today at a damping of 0. I have used it with both NXT and EV3 robots, and with NXT-G and the EV3 software – driving it with the 8 Channel Servo Controller for NXT or EV3 in both cases. V-102 VG1000 Series Three-Way, Plated Brass Trim, NPT End Connections Ball Valves with Beta Valve Systems Ltd are specialists in the supply of solenoid valves, since 1983 we have supplied oems (original equipment manufacturers) and industrial end-users with control solutions using brass solenoid valves, plastic solenoid valves and stainless steel solenoid valves for most common fluids: cold water, hot water, pure water, air, steam, light oils, gases, oxygen and most other fluids. The P33 Safety Exhaust valve is designed to safely remove trapped air from the machine during a faulted or e-stop condition. Servo directional valves are the only hydraulic valves capable of controlling oil flow and/or pressure rapidly and precisely. With Same Day Free Shipping, we build, test & ship your air or electric actuated ball valves & butterfly valves. active and passive valves, however, in lieu of a butterfly valve, the ASAM system uses an active ball-half with a cup machined into the ball-half. Electric actuators used in blade postioning applications. The Servo Operated Pneumatic Valve Kit is a very useful kit indeed. Premature failure of servo valves encountered in industry today are typically causedby fluid contamination and feedback ball erosion. Construction is quite simple and is explained well in the instructions. ) with electrical signals. The suggestion to pinch the 1/8 fuel line would be much easier. The EMG an electromagnetic damping system, reducing strip oscillation speed production line, in the steel industry. Because they use standard RC micro-servos, they can be controlled by a standard RC radio setup. Servo valves operate with very high accuracy, very high repeatability, very low hysteresis, and very high frequency response. The servo tester has an anemic 4. Add to Compare ???QUICK_VIEW??? Low Pressure Ball Valves - V500 Series. Most ball valves are rather stiff, as such they put quite a strain on the servo. A broad selection of valve body, seat, and seal materials provide a wide range of pressures and temperatures at which the valve may be used. The valve is servo-controlled and normally closed (NC). Assured Automation offers many distinct types of actuated 2-way ball valves. BTE™ 401100 Kit Contains: One (1) Turbo 400 Full Manual Valve Body One (1) Separator Plate and Gaskets One (1) Pressure Regulator Spring One (1) 2nd Gear Release Spring One (1) Vacuum Modulator Plug and O-Ring Two (2) 1/4" Check Balls STEP 1: Drain oil and remove transmission from vehicle. Maximizing productivity by minimizing downtime. Looking for downloadable 3D printing models, designs, and CAD files? Join the GrabCAD Community to get access to 2. Servo, Flow & Run/Hold (NH3 Applications) 8160 HD Sprayer Harness Inc. They give systems exact positional accuracy, repeatable velocity and predictable force, and torque regulation, outperforming the competition in even the most An electrohydraulic servo valve (EHSV) is an electrically operated valve that controls how hydraulic fluid is sent to an actuator. This differentiated design allows much larger drill diameters; passage sizes into and out of the  Find out all of the information about the MKS Instruments product: ball valve / servo-driven / pressure-control / two-stage . AC Servo Rod. Second, a 2 inch solenoid valve is quite expensive, even used. If the plug that lives in the middle of OE assembly (repaired by 37947-11K) is loose and bore leaks, a poor 1-2 and/or 2-3 results. Solenoid control valves that change position Open/Close etc by opening small pilot circuits allowing pressurised air, fluid or gas to move the valve are called pilot operated or servo pressure assisted valves. 8V battery and the valve was very marginal. Parker's brass ball valves are designed to provide years of service at an economical price and are available in various end configurations and options. AFP carries a vast line of hydraulic valves, including directional, pressure control and flow control with an excellent line of manufacturers to choose from. ball revealed significant wear, the results confirmed that carbide and sapphire ball did not show any signs of wear. Servo ball valve products are most popular in North America, Eastern Europe, and Mid East. and Stem, NPT End Connections Ball Valve Assemblies with End Switches . Remove oil pan. Inc. designs, develops and manufactures valves, actuators and valve control products. Actuated 1/2" PVC Ball Valve: This instructable was created in fulfillment of the Next, I wired the scripted installed Arduino to the servo, as well as an LCD  Valworx is the #1 actuated valve supplier. Take a mini servo motor, couple it with your inlet pipe and you have a rudimentary but workable valve! Of course you may need to extend the servo motors fins with custom cut PVC portions that match your pipe, but that is not really difficult. LEFS, Electric Actuator, Slider Type, Ball Screw Drive, Motorless. 42 is called a flapper servo and is really the inverse of the jet pipe servo. description years qty part no ill no. Star Hydraulics Limited was founded to provide a cost effective, fast turnaround Service/Repair of Electro-Hydraulic Servo (Moog) Valves including our now famous Sapphire Technology™. The sphere has a large hole, or port, that allows liquid to flow from one side of the valve to the other when the valve is open. The ball valves (both full ball and segmented ball) exhibit a nearly perfect (more so than most equal percentage globe valves) equal percentage inherent characteristic. The servo valve then manipulates the actuator (the equivalent to a simple kind of hand wheel) into carrying out the changes you want to see happen with the flow. You'll need a micro controller or something like an Arduino for precise control of the servo. Features The cause of the malfunction of the servo valve and the removal of Servo valve failure in the electro-hydraulic servo system is often not debugging or found in normal circumstances. Servo valves are often used to control powerful hydraulic cylinders with a very small electrical signal. The ICS pilot operated servo valves from Danfoss ICV Flexline™ platform are quick and simple to handle, install and service due to their low weight and compact design. servo ball valve 3d models ✅. If you are using a "sealed" ballast tank, ie, controlled inlet for H2O and/or controlled outlet for air, then solenoid valves might prove to be the way to go. I found servo-valves - where a servo drive is able to open and close a ball valve. The AC servo version of the LEFS slider features an AC servo motor instead of a DC version. Inadequate metering of 2nd gear band servo release oil causes 3-4 clutch  Offering you a complete choice of services which include Globe / Control Valve, Ball Valve, PSV Valve Repair Services, Servo Motor And Drives Repair Service  Proportional Valves. 8V the valve would operate, but it was slow and getting the ball fully closed was a bit iffy. There is a saying with regards to these causes of failure. Servo Valves With either standard 10gpm valve with normally 4 notches The secondary (or servo) action allows these valves to have a much larger seat than a similarly sized valve. servo ball valve

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