Problem solving valves for your most challenging materials.
From sandblasting to beer brewing and everything in between, Richway’s Airpinch™ Valves can handle anything you can flow at them. Their simple design means no valve seat or seals to plug or get jammed.
The rubber sleeve is able to conform around solids and slurries and once the actuation air pressure is released, they keep your workflow going.
Airpinch™ pinch vales sizes are identified by the internal diameter of the rubber sleeve and do not necessarily indicate the end cap thread size. Hiusing length dimensions include end caps. All valve specifications are approximate.
|Valve||Housing Length||Valve O.D.||End Cap Threads||Control Inlet|
|5/8", 3/4"||4"||2.25"||3/4", 1"||1/4"|
|1 1/4"||5.5"||3.5"||1 1/4"||1/4"|
|1 1/2"||7"||4"||1 1/2"||3/8"|
This information is intended to introduce the multitude of considerations that exist when determining sleeve selection and anticipated performance. In all cases, the end user is responsible for determining the suitability of a sleeve material for a specific application. Actual operating conditions and materials can greatly affect sleeve performance.
***Richway Industries, Ltd., can assume no responsibility for the accuracy and/or completeness of this information when determining sleeve selection or compatibility for any particular application. ***
|Common Name||Available Types||Chemical Definition||Compression Set||Abrasion Resistance||Tear Resistance||Solvent Resistance||Oil Resistance||Temperature Usage|
|Buna N, Nitrile, NBR||B60||Butadiene Acrylonitrile||Good||Excellent||Good||Good to Excellent||Good to Excellent||0 F to 190 F|
|Fair||Good||Fair||Poor||Poor||-30 F to 275 F|
|Natural Rubber, NR||R60|
|Polyisoprene||Excellent||Excellent||Excellent||Poor||Poor||-40 F to 150 F|
|Neoprene®, CR||N60||Polychoroprene||Good||Excellent||Good||Fair||Fair||-10 F to 225 F|
|Silicone, VMQ **||I20|
|Polysiloxane||Good to Excellent||Fair to Poor||Poor||Poor||Fair to Poor||-70 F to 425 F|
|Viton®, FKM, Fluorel®||V65||Fluorinated Hydrocarbon||Good||Good||Good||Excellent||Excellent||0 F to 450 F|
Install directly in the fluid line or put a tee in the line and attach the valve to the leg of the tee.
Hold rods and shafts in a fixed position. Use for linear or rotational motion control.
Control fluidized dry material.
Use actuation pressure to close the valve at “normal” operation pressures for the system.
Modulate surges in pressure or flow rate in a piping system.
Control fluidized dry material.
Can eliminate the need for periodic shutdown of the system to empty a receiver.
Airpinch™ pinch valves can be a real problem solver for demanding control applications. Threaded NPT or BSPT pinch valves housings are available in molded polypropylene and nylon, or anodized aluminum. Choose from a variety of elastomers for optimum compatibility and performance with your controlled media.
Airpinch™ pinch valve housings are precision molded of engineering grade plastics. This results in a rugged valve at an economical price. Molded pinch valves are lightweight and well suited for use where corrodible and heavy metal valves won’t work.
Airpinch™ pinch valves give you fast, positive shut-off of most industrial materials, liquids, and dry flowables. They will close tightly on suspended particulate materials in liquids. Even highly viscous materials are no problem.
Airpinch™ pinch valves are versatile because of their unique flow-through design. They provide rapid operation; full, unobstructed flow; and complete closure. Mount them in any position—even fully submerged.
Richway’s Airpinch™ valves use compressed air, or fluid, to compress the rubber sleeve inside of the valve body to shut off media flow. Operating pressures for controlled material vary depending on sleeve elastomer and valve size. They can range from a moderate vacuum (up to 26″ Hg) to a maximum of 90 psi when controlling with air.
Required actuation pressure is generally 20 to 40 psi greater than media pressure. It’s recommended that the actuation air pressure be set just high enough to get complete valve closure. Using higher actuation pressure than is required to get complete media shut off can reduce sleeve life. Use of actuation pressure above 90 psi is not recommended.
As shown above this is the recommended configuration for controlling an air pinch valve. The regulator is used to set the actuation air pressure and a three-way solenoid controls the regulated air signal going to the valve. Once the pressure to the air pinch valve is released, it’s exhausted back through the three-way valve, allowing the sleeve to open. A quick exhaust valve isn’t required for operation, however in applications where the solenoid is a long distance from the air pinch valve, it’ll allow quick operation by allowing the actuation pressure to exhaust more quickly.
By design Airpinch™ brand pinch valves are normally open and require constant pressure for complete closure. Therefore, a loss of control pressure will allow the valve to open. In the event of sleeve failure, controlled material can enter the actuation system.
CAUTION: Airpinch™ pinch valves should not be used in applications where such conditions could cause system damage or failure. The designer must recognize sleeve failure can occur at any time.
The actuation valve controlling the Airpinch™ must have free exhaust to allow the Airpinch to open. A solenoid, manual, or air-pilot operated 3-way control valve is required. A check valve cannot be used between the Airpinch™ and exhaust port of the controlling valve. Using a QEV can improve valve opening response time.