Dual Plate Check Valve
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The dual disc check valve is known as non-return valve or retainerless check valve. The valve allows the medium to flow in one direction only and to prevent flow of fluids to the opposite direction. The valve is working in an automatic system which contains an articulated mechanism.
It is much lighter in weight and smaller in size compared to a conventional swing check valve body design. This valve design is the result of attempts to provide an alternative in solving the problem associated with swing check valves. The valve contains two spring-loaded plates that are hinged on a central hinge pin. |
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dual Plate Check Valve Catalogue
| Dual Plate Check Valve.pdf |
What are dual plate check valve
1. What is dual plate check valve?
It is made according to API 594 standard. The retainerless valve design enables installation of the stop-pin and hinge-pin of the check valve without drilling completely through the body of the valve.
There is a valve plate like a door freely resting on the inclined valve seat surface. In order to ensure the valve plate matches the proper position of the valve seat for every operation, the plate plays a crucial part to ensure it has enough swing space that is truly and fully accessible to the valve seat.
It is made according to API 594 standard. The retainerless valve design enables installation of the stop-pin and hinge-pin of the check valve without drilling completely through the body of the valve.
There is a valve plate like a door freely resting on the inclined valve seat surface. In order to ensure the valve plate matches the proper position of the valve seat for every operation, the plate plays a crucial part to ensure it has enough swing space that is truly and fully accessible to the valve seat.
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The valves are suitable to apply in typical applications such as:
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SS316 Wafer Dual Disk Check Valve
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2. How does a dual plate check valve work?
The valve plate opens when the fluid pressure flows through one direction. If the liquid moves in opposite direction, due to fluid pressure and plate effect on the valve seat, the flow will be cut off. The reducing flow will cause the plate to close by the torsion spring action without any reverse flow required.
The valve has a cylindrical body and which can have much more uniform distribution of stress compared to other valves design. The cylindrical body is designed to withstand extreme weight that is as much as to the weight or thickness of the valve. Therefore, for rugged loading conditions, this valve has a distinct edge in term of safety and economics.
The valve plate opens when the fluid pressure flows through one direction. If the liquid moves in opposite direction, due to fluid pressure and plate effect on the valve seat, the flow will be cut off. The reducing flow will cause the plate to close by the torsion spring action without any reverse flow required.
The valve has a cylindrical body and which can have much more uniform distribution of stress compared to other valves design. The cylindrical body is designed to withstand extreme weight that is as much as to the weight or thickness of the valve. Therefore, for rugged loading conditions, this valve has a distinct edge in term of safety and economics.
3. What is non-slam check valve?
The design offers double advantages of no water hammer and non–slam simultaneously and it makes the valve to be one of the most efficient valve option. The swing plate is hinged at the top of valve and the force of gravity includes high inertia as it swings to the closing position. Otherwise, the momentum would cause severe damage when the plate slams to the valve seat. To minimize the frequency of momentum, the valve has to go for a balancing weight.
The two plates are hinged in the middle of the valve vertically for horizontal installation which also eliminates the effect of the gravity altogether. The momentum developed as the plates move to the closing position is a fraction of the valve as the weight of each plate is quarter the weight of the swing plate and the tip velocity is less than half. In addition, with the assistance of the spring during closing of the valve, the valve will reach zero flow before backflow begins. The flow as such cushions the plates and seat hence the chances of slamming are negligible when it starts to close.
The design offers double advantages of no water hammer and non–slam simultaneously and it makes the valve to be one of the most efficient valve option. The swing plate is hinged at the top of valve and the force of gravity includes high inertia as it swings to the closing position. Otherwise, the momentum would cause severe damage when the plate slams to the valve seat. To minimize the frequency of momentum, the valve has to go for a balancing weight.
The two plates are hinged in the middle of the valve vertically for horizontal installation which also eliminates the effect of the gravity altogether. The momentum developed as the plates move to the closing position is a fraction of the valve as the weight of each plate is quarter the weight of the swing plate and the tip velocity is less than half. In addition, with the assistance of the spring during closing of the valve, the valve will reach zero flow before backflow begins. The flow as such cushions the plates and seat hence the chances of slamming are negligible when it starts to close.
4. The advantages of using dual plate check valve
- Light weight thus easier to handle.
- Can be installed horizontally or vertically.
- More compact and structurally sound design.
- Low pressure drop and reduced the energy loss irrespective of valve pressure ratings.
- Inherently non-slamming.
- Streamlined flow-way.
- Long life and trouble-free valve operation.
- Efficient and positive sealing under pressurized condition. Valve closes before flow reversal at zero velocity.
5. How to install dual plate check valve?
Step 1: Valve cleaning service
Both ends of the valve are protected by rust proofing oil. Clean the valve before installation and check to ensure valve plate are free of rust/oil.
Step 2: Decide direction of flow
The flow direction in the line should coincide with the flow direction indicated by the arrow sign on the valve body.
Step 3: Insert valve in horizontal piping
Insert the valve into the pipeline, with that the pin retainers are placed in an up and down position.
Step 4: Measure distance between dual plate check valve and flange
When both flanges are attached to check valve body, ensure that there is enough distance.
Step 1: Valve cleaning service
Both ends of the valve are protected by rust proofing oil. Clean the valve before installation and check to ensure valve plate are free of rust/oil.
Step 2: Decide direction of flow
The flow direction in the line should coincide with the flow direction indicated by the arrow sign on the valve body.
Step 3: Insert valve in horizontal piping
Insert the valve into the pipeline, with that the pin retainers are placed in an up and down position.
Step 4: Measure distance between dual plate check valve and flange
When both flanges are attached to check valve body, ensure that there is enough distance.
dual Plate Check Valve Catalogue
| Dual Plate Check Valve.pdf |
