Shop Valves Online! Valve Selection Guide

Isolation Valves operate in two positions: fully open and fully closed, hence referred to as on/off valves. Valves for on/off service are designed for reliable shutoff when closed and minimal restriction when open. Common types of isolation valves include ball valves, gate valves, butterfly valves, diaphragm valves, and plug valves.

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• Ball Valves offer tight shutoff and high capacity with just a quarter-turn to operate. Common in sizes from 1/4" to 6", ball valves can be easily actuated with pneumatic and electric actuators.

• Butterfly Valves are used for both general and severe service applications. Resilient liners provide tight shutoff for general services, while triple offset metal-seated butterfly valves are designed for severe services. Butterfly valves are economical for comparable capacity and can be easily automated with pneumatic and electric actuators.

• Check Valves are unidirectional flow control devices used to prevent backflow. They employ a disc, ball, or plates that open with flow and close with a drop in pressure, either by gravity, back pressure, or a mechanical spring.

• Diaphragm Valves are simple valves using a resilient diaphragm for tight shutoff that isolates the body from its operator. Ideal for corrosive, slurry, and sanitary services, they can be actuated with pneumatic and electric actuators.

• Float Valves automatically control liquid levels to prevent tank overfilling. Operated mechanically by a float, they open and close based on the liquid level.

• Gate Valves are ideal isolation valves for high-pressure drop and high-temperature applications. Automated typically with multi-turn electric actuators, gate valves have a sliding disc for manual or automated operation.

• Globe Valves feature a conical plug and are used for shutoff and throttling in high-pressure drop and high-temperature applications. Available in globe, angle, and y-pattern designs, they are commonly operated through a multi-turn handwheel assembly.

• Plug Valves use a cylindrical element instead of a spherical one, making them more rugged but also more expensive than ball valves. Plug valves can be automated with quarter-turn actuators.

• Solenoid Valves are electrically operated, using a spring-held valve plug. When energized, the electromagnetic force changes the plug position. Solenoid valves are ideal for fluid shutoff and switching in general services.

3-Way Switching Valves redirect fluid flow within a piping system and can replace two 2-way valves. Commonly designed as ball, plug, and globe configurations, they offer a cost-effective solution for large pipe sizes.

Control Valves modulate fluid flow within a piping system. Reciprocating and rotary globe control valves with pneumatic diaphragm actuators are recommended for precise automatic flow control.

• Reciprocating Globe Valves are rugged and provide accurate control through a torturous flow path. They include noise and cavitation control trims.

• Rotary Globe Valves offer low-friction rotary motion with similar control characteristics to reciprocating valves. They are preferred for general services due to their low cost and high capacity.

• Vee-Port Ball Valves have a V-ported ball design ideal for general flow control in sizes up to 4". They offer the benefits of economy, simplicity, and the sealing features of a quarter-turn ball valve.

• High-Performance Butterfly Valves (HPBV) with double and triple offset discs provide a parabolic characteristic. HPBVs are ideal for general flow control in sizes greater than 3".

• Pressure Regulators maintain controlled pressures in piping systems, typically by reducing inlet supply pressures or maintaining constant back pressures.

• Pressure Relief Valves protect vessels and piping systems from overpressure. They open when pressure exceeds set limits and close once the pressure drops sufficiently.

Pressure/Temperature Rating: Ensure the process fluid's pressure and temperature are within the manufacturer's rating for a given valve.

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Body Materials: Choose valve materials based on strength and resistance to corrosion. Options range from plastic for low-pressure systems to stainless steel and exotic alloys for higher strength and corrosion resistance.

• Seal Materials: Select elastomeric and plastic seals based on chemical compatibility with the process fluid. Elastomers offer better sealing properties while plastics are suitable for harsh chemicals.

• End Connections: Choose based on cost, standards, and maintenance preferences. Threaded ends have low costs but may leak, welded ends offer rigidity, and flanged ends provide easy installation and removal.

Actuator Selection: Actuators operate valves automatically or remotely. They can be pneumatic, electric, or hydraulic and must provide sufficient force to overcome valve friction and torque requirements.

• Pneumatic Double-Acting Actuators use gas to pressurize a double-acting cylinder. A 4-way solenoid valve switches pressure between cylinders.

• Pneumatic Spring Return Actuators use spring-opposed cylinders and are inherently fail-safe. A 3-way solenoid valve operates the actuator.

• Electric Actuators use a reversing motor and gear reduction to drive a valve shaft. They require backup power for fail-safe operation.

Accessories support valve automation systems with components like solenoid valves, limit switches, positioners, filter regulators, speed control valves, and fail-safe accumulators.

• Solenoid Valves switch pressure ports using electromagnetic force, controlling pneumatic valve actuators.

• Limit Switches provide signals indicating valve positions, often used as interlocks in control systems.

• Positioners position a valve based on a control signal. They may be analog or digital, with digital alternatives offering enhanced features.

• Filter Regulators filter and regulate air supply for pneumatic instruments. They ensure optimal performance and prevent contamination.

• Speed Control Valves manage the operational speed of automated pneumatic valves by controlling flow rates.

• Fail-Safe Accumulators enable fail-safe operations for double-acting pneumatic actuators using stored gas.

• Manual Overrides allow manual operation of a valve during emergencies, using a handwheel gear operator.

• Chainwheels enable easy remote operation of valves in high or hard-to-reach locations.

Strainers remove debris from pipelines, protecting vital equipment. Common types include Y-Strainers and Basket Strainers.

• Wye Strainers have a y-pattern design and remove solids from various lines using a perforated or wire mesh screen. They are cost-effective for minimal solid content lines.

• Basket Strainers contain a basket for removing large amounts of solids, safeguarding equipment from sediment damage.

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