Pinch valves are widely used in various industrial applications. They are full bore type of control valve. There is no obstruction to flow passage. These kind of valves are ideally suited for the handling of slurries, liquids with large amounts of suspended solids.
They are used in systems that convey solids pneumatically. Pinch valve are linear action valves that can be used in both an off / on manner or in throttling service or in a variable position. They are supposed to be the simplest in any valve design. Pinch valves are used in various applications like are medical, pharmaceutical, slurries, pulp, powder, pellets and wastewater.
Parts of Pinch Valves:
- Stainless steel
- Cast iron
- Carbon steel
- Steel etc.
Major components of a pinch valve are as follows:
- Body (Sleeve)
- Pinching device
The pinch valve consists of a sleeve and a pinching mechanism. The
sleeve is the pinch valve body and made of such materials which are
corrosion resistant. All of the operating portions are completely
outside to the valve. Sleeves come with either with a flanged end having
standard dimensions or extended hubs and clamps designed to slip over a
pipe end. The sleeve will contain the flow media.
How does a pinch valve operates?
Pinch valves are closed either by fluid actuation or manual means.
Electro-mechanical closure takes place by actuating a solenoid, which in
turn lowers a bar or gate onto the sleeve, cutting off the flow. With
fluid actuated pinch valves, the pinching action is completed by air or
hydraulic pressure placed directly on the elastomer sleeve. The pinch
valve body acts as a built-in actuator, which eliminates costly
hydraulic, pneumatic, or electric operators. The pinch valve is closed
mechanically with the movement of the pinch bars located on opposite
sides of the sleeve.
Uses of Pinch Valves:
The following flow chart will give us an idea as to why
should we use pinch valve:
of Pinch Valves:
- Pinch Valves help in installation in grooved-end piping.
- They offer position indication and noise reduction.
- They handle aggressive, particulate-laden liquids.
- They are suitable for on/off fluid control applications.
- Pinch Valve controls viscous, abrasive and corrosive fluids.
- Pinch valves are suitable for high purity applications.
- They are used for both manual and automatic throttling.
- They are used in the waste treatment plant.
- They are useful in the handling of lime slurry and
carbon-impregnated activated sludge.
- Pinch Valves are considered to be reliable, maintenance-free,
- They are capable of handling the most abrasive, tough slurries,
dry solids in process industries and corrosive chemical
- Pinch valves are used in various applications in wastewater and
raw water applications.
- They help cut maintenance costs in abrasive service.
Pinch Valves are just ideal to solve all process problems which are
associated with abrasive or corrosive fluid handling in various areas
- Pulp and paper
- Mineral processing
- Power generation
- Chemical handling
- Effluent treatment
- Water and wastewater etc.
The points mentioned below will be a guide for the buyers: