Closed-body pinch valves can be operated by pneumatic air pressure or manually. They are typically made of 316 stainless steel or aluminum and feature either rubber or flexible sleeve options. These valves have a built-in actuator that acts on the pressure from the air or hydraulic fluid. Depending on the application, they can be operated manually, semi-automatically, or automatically.
This type of valve has a sleeve that is flexible, reducing maintenance and reducing the need for expensive anticorrosion body materials. The sleeve is easily replaced. Closed-body pinch valves are available in a wide range of configurations and are available at reasonable prices.
Liner motion type
A pinch valve is a valve which blocks the flow of fluid through a tube. They are ideal for aseptic production lines and applications where product purity is paramount. However, pinch valve they have some drawbacks. For example, they are not suitable for high pressure flow and high temperature liquids. They are best used in applications involving slurries and other liquids that contain suspended solids.
When choosing a pinch valve, it is important to consider its range of operation. A typical range of operation is from 10% to 95% of the nominal flow rate. The most effective flow control is achieved during the last 50% of the stroke. This is because the smooth walls of the liner prevent a large pressure drop before the valve closes. However, a pinch valve may not be suitable for throaty closing applications, as this can damage the liner or break the groove.
The flow characteristics of a pinch valve can be determined through a variety of methods. One method is through simulation. This method is useful for determining the flow rate, but it does not give the exact pressure drop in the system. Flow characteristics of a pinch valve are primarily dependent on its design. The optimal design should minimize the stress placed on the tube.
In this study, the flow characteristics of the pinch valve were determined using a three-step model. This model included a series of tests. The flow rate of a valve depends on the change in the ratio of its opening to its closing position. For instance, a change of 20% to 30% of the valve’s opening produces a 70% change in the flow rate.
Pinch valves are available with different tubing options to meet the specific needs of the application. The inner diameter (ID) and length of the tubing play a big role in determining the internal volume. Most medical applications choose tubing with an ID of 1.5 mm or less, which corresponds to a flow rate of about 50 mL/min. Choosing a pinch valve with an ID that meets the flow rate requirements of an application is a top priority.
Pinch valves are available with various flange configurations, including side-open and end-flange configurations. These configurations make it easier to insert and remove the valve. Additionally, some have end flanges that fit flush with the transport tubing. In addition, some pinch valves come with limit switches and position sensors, which can ensure reliable operation.
When you need to control the flow of liquids or gases, a pinch valve is an ideal solution. These valves do not have dead volumes and allow fluids to pass only through the inside of the tubing. They are available in various sizes, designs, materials, and price ranges. They are widely used in the pulp, sewage, acid-alkaline, and solids handling industries.
The material used to manufacture pinch valves differs from one manufacturer to another. Most of these valves are made of steel or aluminium, while some are made from stainless steel. Choosing the right material is crucial to ensure durability and performance.