| Model： | ||
| Standard or Nonstandard： | Standard |
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| Pressure： | HighPressure |
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| Material： | CastIron,CastBronze,CarbonSteel |
| PriceRange： | ||
| Structure： | Check |
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The wide employment of the split disc check valve or the dual plate check valve has been shown on many fields for a variety of industries. During the entire operation, the disc plate and the spring cooperate to play an important role. When the valve is normally closed, the disc plates are kept shut by the torsion spring. And when fluid flows in the forwards direction, the pressure of the fluid causes the disc plates to hinge open, allowing flow. As a result, the function of the most check valve to allow the forward flow and to prevent the reverse flow has been fully achieved.
However, the frequent opening and closing would soon cause seat damage if the heels of the disc plates were allowed to scuff against the seat during opening. And if the heel of the disc plates lift during the initial opening of the valve and the plates rotate purely on the hinge as opposed to the seat face, the unpleasant situation can be solved effectively.
No matter what, the popularity of the split disc check valve or the dual plate check valve has been definitely realized. Several advantages of this kind of check valve which are supposed to be over other types of check valves are listed as follows.
1) The split disc design is not limited in size and these valves have been produced in sizes of up to DN5400.
2) The pressure drop across the split disc check valve is significantly lower than across other types.
3) They are capable of being used with lower opening pressures.
4) Split disc check vales can be installed in any position, including vertical pipelines.
Dual plate check valve, also called the split disc check valve, is designed to overcome the size and pressure drop limitations of the swing and disc type wafer check valves. Or it can be said that the dual plate check valve is the derivative of the previous swing check valve. For the dual plate check valve, the flap of the swing check valve is essentially split and hinged down its centre, such that the two disc plates will only swing in one direction. The disc plates are held against the seat by a torsion spring mounted on the hinge.
And the external mounted retainer pins are needed to hold the hinge in the centre of the flow path. Besides, an improved design secures the hinge internally and the valve mechanism is entirely sealed within the body. As a result, the leakage to atmosphere caused by the retainer pins is prevented effectively.
The valve is normally closed, as the disc plates are kept shut by the torsion spring. When fluid flows in the forwards direction, the pressure of the fluid causes the disc plates to hinge open, allowing flow. The check valve is closed by the spring as soon as flow ceases, before any reverse flow can occur.
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