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Red Valve Type A Air-Actuated Pinch Valve
Overview:
Red Valve Control Pinch Valves offer maximum durability with precise control and virtually no maintenance. A heavy-duty, rugged pinch mechanism positions the sleeve, resulting in accurate flow control. Our Control Pinch Valves have no packing to maintain or seats to wear, no fugitive emissions and no need for expensive body alloys. Variable orifice and cone sleeves can be specified to further enhance control performance and match the exact CV level desired. True feedback positioning is accomplished through the direct linkage of the pneumatic positioner to the valve stem shaft, with no splitting of the positioner output. Red Valve Control Products are available with pneumatic, electropneumatic, or digital positioners to link up to all control systems.
Description:
Introduced and patented by Red Valve, the air -actuated Type 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 throughout the world. The secret is in the rubber sleeve – the valve’s only wetted part.
Actuation of the valve is accomplished by air or hydraulic pressure placed on the sleeve. The valve body acts as a built-in actuator, eliminating costly pneumatic, hydraulic or electric actuators. Adding air pressure within the annular space between the body and the sleeve can open, throttle or close the valve.
The sleeve’s flexibility allows the valve to close drop-tight around entrapped solids, eliminating hang-ups that can damage the valve. Sealing area is equal to 95% of the valve’s length. With Red Valve Type A Pinch Valves, there are no seats or packing to replace, or cavities or dead spots to collect debris and bind valve operation. Their abrasion resistance is unmatched. When the valve is open, it is 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. In general, 25-35 psi over line pressure is required for full closure of Red Valve Type A Pinch Valves.
Control
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.
Type A Double Wall
Designed for highly abrasive applications, the Type A Double Wall Sleeve Valve outlasts even stellated 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.
Type A Cone
Type A Valves equipped with a cone sleeve are designed specifically for throttling control applications. By reducing the effective port size, the Cv of the valve can match the Cv required.
