Fluid flow in industries is often controlled using pinch valves. These pinch valves control opening/closing by applying a force at the center of the valve. This forces the valve to close and blocks flow. The force applied on these rubber lined valves is done through different actuation types. Additionally, the internal rubber lining allows the valve to act as wastewater treatment valves due to their added corrosion resistance. Continue on to learn more about these pinch valves.
Understanding a pinch valve’s functionality depends on the understanding of its components. The main pinch valve components are the outer structural body, the internal rubber sleeve and the connection types. The outer body holds everything in place and the connection types provide support by connecting the valve to the pipe.
The internal rubber lining is what largely controls the fluid flow. This lining stretches from the inlet to the outlet and prevents fluid contact with the internal valve body. The internal rubber lining allows/blocks flow by connecting to the external hinge. This external hinge is usually a handwheel which can be moved manually or automatically.
When the external handwheel is revolved around, it puts pressure on the center of the internal lining. This causes the lining to “pinch” and hence closes the valve. When the force is removed, the rubber lining goes back to its original spot and allows flow.
The general functionality of all pinch valves is the same. For a hydraulic pinch valve, the force applied is automatic. Hydraulic fluids are used to pinch the center of the valve blocking flow.
For a solenoid sleeve pinch valve, the opening and closing is controlled using electricity. The plunger which pinches the valve is moved up and down using electricity.
In the case of pneumatic pinch valves, the pressure applied on the center is done using compressed air. This compressed air is provided using an external source.
While diaphragm valve functionality is pretty similar to that of pinch valves, they’re quite different. In a sleeve pinch valve, fluid flow is blocked by pinching the valve to close at the center. In a diaphragm valve, this is done using a flexible diaphragm.
An additional component applies force on the diaphragm. This extends it and blocks fluid flow by closing the valve from the center. Once the valve is opened, pressure on the diaphragm is released and it moves out of the way allowing fluid flow.
| Diaphragm Valve | Pinch Valve |
| More Expensive | Cheaper |
| Better Sealing Properties | Sealing is not as good as diaphragm valves |
| Complex maintenance but not required often | Maintenance is easy but required often |
| Immediate Fluid shut off not possible | Immediate fluid shut off is possible |
| Requires manual cleaning | Self cleaning properties |
Pinch Valves are found in the following industries:
Pinch valves can be maintained by following a general routine:
Founded in 1982, LIANKE Valve is one the leading producers of sleeve pinch valves. Customers looking to find high quality hydraulic pinch valves are in luck with LIANKE Valve as each product found here is compliant with CE, API, ISO, EAC, and TS industry standards.
Moreover, customers will be able to find a large variety of pinch valves. At LIANKE Valve, you’ll find a pneumatic pinch valve, hydraulic pinch valve, extra elastomer sleeves, and even electric pinch valves. Additionally, when customers are looking to get quotes, their needs will be met in under 24 hours. So, head over and get your quotes!
The inner elastomer sleeve in pinch valves must be replaced every 200,000 to 500,000 fluid cycles. If not, the valve is more susceptible to damage and leaks. Additionally, it may cause damage to the internal body of the valve which will require more complex maintenance.
The key applications and benefits of pinch valves in industrial processes are their full bore design and added durability. This allows efficient fluid flow and the internal rubber sleeve allows valves to carry abrasive slurries. Additionally, these valves require minimal maintenance and have self cleaning properties.
What is a Pinch Valve? General Technical Overview – Geeplus.com
What is Pinch Valve?- Types, Working And Uses (theengineeringchoice.com)
Pinch Valves: An Uncomplicated Valve With an Important Purpose | Valve Magazine
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