Pinch valves are versatile valves that regulate the flow of any fluid or medium. They can be made from several materials, including synthetic polymers and natural rubber. Their sleeve material is also chosen based on the characteristics of the flow media. However, whichever material is chosen, it must meet a particular limit. Natural rubber, butyl, EPDM, and nitrile are common material choices for pinch valves. Other materials include aluminum and plastics.
Air-operated pinch valves
Air-operated pinch valves are a practical and economical solution for shut-off valves. These valves can be used in a variety of applications where flow media needs to be isolated from the surrounding environment. They reduce contamination and are commonly used in a variety of laboratory equipment and medical instruments. The following are some benefits of air-operated pinch valves: They don’t require a separate drive/actuator.
Mechanical and air-operated pinch valves feature a sleeve made of highly elastic and robust rubber. They can also be equipped with devices for flow restriction and have full-bore designs, which prevent pressure drop and ensure complete stoppage. Lastly, they are easy to clean and maintain.
Mechanically pinched pinch valves
Mechanically pinched pinch valves are used in various applications to isolate fluid from mechanical valves. They are made of different materials, including neoprene, silicone, or EPDM, a synthetic rubber membrane with higher heat resistance than natural rubber. EPDM is also more heat resistant than nitrile. Another type of elastomer used in pinch valves is FKM. Other materials for the body of pinch valves include stainless steel or aluminum.
This type of valve limits the maximum stress placed on the flexible tubing through a mechanical design that limits the gap between the active and passive pinching components. This reduces the influence of damage on flow characteristics and increases the life of the tubing. Mechanically pinched pinch valves generally have a minimum closing threshold equal to twice the outer diameter of the uncompressed tube. Thickness measurements are also taken to ensure that excessive stress is not placed on the tubing.
Enclosed-body pinch valves
The main advantages of enclosed body pinch valves are their low pressure drop and their high throttling range. Depending on the type, they can throttle flow between 10% and 95% of their rated capacity. The look at more info best flow control occurs during the last 50% of the valve’s stroke, when the smooth wall surfaces and resilient liner provide maximum flow control. However, they are not suited for media with sharp particles, which could tear or scratch the liner.
When deciding on a pinch valve, its construction should match the application. Ideally, the body material should be light and flexible, as the sleeve will be in contact with the flowing medium. The sleeve material should also be resistant to abrasion, as it comes into direct contact with the flowing fluid. EPDM, NBR, silicone, and food-grade rubber are all suitable options.
Throttle pinch valves
Throttle pinch valves can be found in many different applications and have a wide range of throttling capabilities. They can be used for a variety of fluids and media types, from liquids to solids and slurries. Regardless of their intended use, pinch valves are an excellent choice for many industries.
Pneumatic pinch valves can be operated manually or automatically. A pressure signal is applied to the stem of the valve and changes the flow of air. This air pressure changes the flow of the valve, which is what produces power. Throttle pinch valves are fast-acting, and a pneumatic actuator allows for open and close positioning of the valve. Pneumatic actuators also dampen the noise produced by the valve’s plunger.