Pinch valve is a valve comprising a flexible tube, either exposed or enclosed in a body. The tube is pinched to close mechanically or by application of fluid pressure in the body.
The "working" element of a pinch valve, also known as a clamp valve, is an elastomeric tube or sleeve which can be squeezed at its mid-section by some mechanical system until ultimately the tube walls are pinched or clamped together producing full closure of the flow path.
In its simplest form it can consist merely of a length of elastomeric tube fitted with a pinch bar mechanism incorporating a closure stop to prevent over-pinching of the tube. More usually the moulded rubber tube is housed in a metal body which also incorporates the pinching mechanism. This can be a simple screw-operated mechanism, where the pinch is applied only to one side of the tube, or a differential screw controlling two pinching mechanisms working in vertical opposition. The latter produces lower-stress working of the tube.
Other types of pinch valves dispose with mechanical mechanisms entirely, the tube being squeezed shut by air or hydraulic pressure injected directly into the body of the valve.
A pinch valve delivers a practical and cost effective solutions involved in flow control situations in your pipe line. Such procedure is accomplished with the use of the rubber sleeve which is indeed the only part of the valve control that comes in contact with any liquid. This device has gained its popularity for medical, pharmaceutical and other sanitary purposes because it aids in pressurized cleaning and movement of liquid. Other designs of the valves available in the market are well suited in controlling clean fluids however, they are unable to handle substances that contains high concentrations of suspended solids because the granules and particles can potentially block the metal barrier.
Just like any other devices, a pinch valve requires maintenance to ensure that it is on its peak performance at all times. Regular tune ups contribute greatly in extending the life of the control valve and it ensures a reliable opening and closing mechanism. The various parts and systems of the valve need to be protected so that each of them will work accordingly during the course of use. Moreover, it is advisable to follow procedures given by the manufacturers in reference to repair or replacement to guarantee that it can return to its superb functioning again.
A pinch valve is referred as a full bore or fully ported type of control valve that utilizes pinching effect in order to block the flow of fluid. It has been noted that such type of valve has the capacity to effectively regulate the flow of both abrasives and corrosives because no contact is made through the metal parts and the transport media. This valve can be closed by either manual procedure or through fluid actuation; electromechanical closure is performed once solenoid has been stimulated and as a result, the bar or gate is lowered into the sleeve which blocks off the flow while fluid actuation works by means of air or hydraulic pressure that is positioned towards the elastomer sleeve.
Pinch valves are usually described as a fluid control device that capitalizes on flow path constriction in order to reduce or shut off the passage of a specific material. Most designs created for this valve control contains a highly elastic sleeve or insert towards the valve body that is being constricted or squeezed closed with the use of air pressure or mechanical intervention. Such valve closure method is noted to not just function effectively in controlling clean fluids but it likewise works for slurries that contain high concentrations of suspended solids.