Text version of the page

Type A Cone Control Type A Double Wall Type A Cone Sleeve Valves are designed specifically for throttling control applications. The Cv of the valve canbe matched to any requirement by reducing the port at the center of the sleeve. The port reduction is main- tained through the downstream half of the sleeve for increased wear resistance, and, since pressure recovery occurs downstream of the valve, cavitation is minimized. Throttling control is accomplished by using a booster or proportional relay to modulate air pressure to the Type A Valve. A changing air signal through the proportional relay will modulate the Type A Valve. Designed for highly abrasive applications, the Type A Double-Wall Sleeve Valve outlasts even stellited V-Ball valves and metal-seated valves on abrasive slurries. To compensate for the extra sleeve thickness, the valve body is increased to the next size.

Condensed Catalog - 19323 Type A Pinch Valve

built-in actuator ,eliminating costly pneumatic, hydraulic or electric actuators. Modulating the air pressure within the annular space between the body and the sleeve can open, throttle or close the valve. Approximately 35 psi over line pressure is required for closure.The sleeve’s flexibility allows the valve to close drop-tight around entrapped solids, eliminating hang-ups that could damage the valve. The sealing area is equal to 95 percent of the valve’s length. There are no seats or packing to replace and no cavities or dead spots to collect debris and bind valve operation. The Type A Valve’s abrasion resistance is unmatched. When the valve is open, it operates like a straight piece of pipe in the line. Type A Valves are used on remote locations or harsh environments since there are no external links, levers, pistons or rotating parts to cause downtime.

Closes drop-tight on entrapped solids

Introduced and patented by Red Valve, the air-actuatedType A Pinch Valve offers a unique, cost-effective solution to flow control problems. More Red Valve Type A Valves are in use than any other pinch valve through- out the world. The secret is in the rubber sleeve – the valve’s only wetted part.Actuation of the valve, the pinching action, is accom-plished by air or hydraulic pressure placed on the sleeve. The valve body acts as a

Body functions as built-in actuator No cavities or dead spots to bind valve operation Full-port, double-wall or cone sleeve trim Simple design not affected by harsh externalenvironments No packing to replace or maintain, ever Cost effective, maintenance free

6

Materials of Construction

Cast iron or aluminum body Sleeves available in Pure Gum Rubber, Neoprene, Hypalon
® , Chlorobutyl, Buna-N, EPDM and Viton
® ANSI Class 125/150, 250/300

Controlling a Type A with a Proportional Relay

Instrument AirExhaustPlant AirSupplyAir toType A Exhaust Plant AirInstrumentAirPlant Air To Type A

Red Valve recommends an adjustable relay (as opposedto a fixed, proportional relay).