What is a pinch valve used for?
A Pinch Valve is an economical piece of equipment that works like a tap. It has an on/off function, to shut off, allow or control the flow of any media passing through it.
What is the motion of pinch valve?
Pinch valves facilitate opening and closing the flow of liquid through a tube without any contact between the liquid and the valve itself. The tube is pinched between a fixed and a moving bar (pinch elements), as these are closed together the tube is pinched closed until flow is shut off.
What are the advantages of a pinch valve?
The main advantage of the pinch valve is its resistance to abrasion, since its straight full bore offers little resistance to the fluid. Furthermore the fluid conveyed is only in contact with an elastic rubber sleeve and no metal part.
How does a pinch valve stop flow?
Pinch valves are similar to diaphragm valves, in pinch valves, the body is provided with sleeves, which get squeezed to control or stop the flow. The sleeve could be of corrosion-resistant materials such as rubber or PTFE. These valves shut off the flow by pinching and sealing off a synthetic or natural rubber tube.
What kind of valve is a pinch valve?
A pinch valve is a full bore or fully ported type of control valve which uses a pinching effect to obstruct fluid flow.
Can you throttle a pinch valve?
Considered as one of the simplest designs, the pinch valve has a soft elastomer liner. It is pinched to close using fluid pressure. Throttling capabilities of the pinch valve is usually between 10% to 95% flow rate capacity. Its best efficiency rate is at 50%.
What do pinch valves and diaphragm valves have in common?
Diaphragm valves are comparable with pinch valves in terms of their function and design. Both have a soft seal rubber element fitted in the valve housing that performs the main task of stopping the flow of media.
Can you use a gate valve to regulate flow?
A gate valve is generally used to completely shut off fluid flow or, in the fully open position, provide full flow in a pipeline. Gate valves are generally not suitable for regulating flow or pressure or operating in a partially open condition. For this service, a plug valve or a control valve should be used.
How is a pinch valve closed by an actuator?
Pinch valves are available with several different types of actuators. Pinch valves may be closed either by manual means, or fluid actuation. Electromechanical closure is effected by actuating a solenoid, which then lowers a bar or gate onto the sleeve, cutting off the flow.
Is there a pneumatic version of a pinch valve?
Both solenoid and pneumatic versions are available for complete assurance of media non-contamination, fast tubing change out, and easy valve replacement. Pneumatic Pinch Valves are designed to handle higher pressure applications, where more force is needed to control flow.
How is a pinch valve closed in an elastomer?
Pinch valves may be closed either by manual means, or fluid actuation. Electromechanical closure is effected by actuating a solenoid, which then lowers a bar or gate onto the sleeve, cutting off the flow. With fluid actuated pinch valves, the pinching action is accomplished by air or hydraulic pressure placed directly on the elastomer sleeve.
Why are pinch valves used for throttling services?
The pressure of the media in the valve can help in starting or stopping the flow. Pinch valves can be used for On/Off, as well as throttling services. Pinch valves are ideal for on/off services because of their straight through design that allows for uninhibited flow.