Pinch valves are a class of control valve that use a pinching effect to block fluid flow. These valves can be either fully ported or fully bored. They are commonly used in air conditioning and refrigeration systems. The pinching effect obstructs flow to maintain a constant pressure or flow rate, depending on the needs of the application.
Mechanically pinched pinch valves can be used to regulate the flow of liquids. These valves have a body made of rubber or synthetic material that includes a pinching mechanism. The rest of the operating parts are located outside of the valve and are not in contact with the fluid. The body of the valve is typically reinforced with fabric. The liner of a mechanically pinched pinch valve has smooth walls to minimize turbulence and line vibration. The valve is also a bubble-tight closure and is therefore ideal for high-pressure applications.
This type of valve has a variety of applications and benefits. It is used in a wide range of processes that require the separation of different media. These applications include waste water, solids handling, chemical equipment, and pharmaceutical dispensing.
An enclosed-body pinch valve has a molded sleeve made from rubber or synthetic material. The pinching mechanism is located within the sleeve while the operating portions are located outside the valve body. The molded sleeve is reinforced with fabric to prevent leakage. The evr valve smooth interior walls minimize line vibration and turbulence. This design allows a bubble-tight shutoff and does not require packing.
Another type of enclosed-body pinch valve is the diaphragm type. While these two valve types are similar, the main difference is the design. Both feature a soft seal rubber element that prevents the flow of media.
A Normally closed pinch valve (NCPV) is a type of valve that allows for the controlled flow of gases. Its advantages include being corrosion-resistant and lightweight. The downside is that it has a limited operating temperature and pressure range. Normally, it cannot handle more than 200degF and 300psi. This means that it is not ideal for applications that require high pressures or high flow rates.
Normally closed pinch valves operate in a similar fashion to normal pinch valves, except that the spring and elements that close the valve are not in direct contact with the liquid. A normally closed pinch valve blocks flow when energized, while a normally opened one permits flow when powered.
Changeover valves for pinch valves are air operated valves that control the flow of a range of media. They can be used in harsh media and are ideal for many industries. These valves are made with a durable EPDMh2 sleeve for long life and are available in a range of sizes and connection materials.
These valves are perfect for finish fill applications, due to their ease of loading and operation. They close automatically under varying pressure conditions and are suitable for use with flexible silicone hoses. They are easy to install and use, and clamp securely onto the existing flexible braided hose. Unlike other types of valves, they do not need secondary tube inserts or end connections.