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Metering pump accessory / safety valve back pressure valve inside the DN152025

price:USD$85.00
discount 70% in 2018-09-18 to 2018-09-20
price: USD$ 59.50
freight :USD$18.00,(Express)
freight :USD$7.00,(Postal parcel)
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Please consult the relevant price of the corresponding model, and directly take the minimum caliber!

DN15  85  

DN20  130 

DN25   175

Back pressure valve through built-inSpringElastic force to achieve action: when the system pressure is smaller than the set pressure, the diaphragm is blocked by the spring forcePipingWhen the system pressure is greater than the setting pressure, the diaphragm compression spring, the pipeline is connected, the liquid through the back pressure valve.

In the condition that the pipeline or the equipment vessel is unstable, the back pressure valve can keep the pressure required by the pipeline, so that the pump can output normallyflow. At the end of the pump, siphon phenomenon occurs due to gravity or other effects. At this point, the backpressure valve can reduce the flow and pressure fluctuation caused by siphon. For metering pumps and so onPositive displacement pumpExcessive delivery occurs when working at low system pressure. In order to prevent similar problems, the outlet of metering pump must be at least 0.7Bar back pressure, generally through the installation of back pressure valve at the outlet of metering pump to achieve the purpose.

Two. Main functions

1. exportsThe ConduitThe check valve is used to prevent liquid backflow, and the backpressure valve is used to maintain a constant pressure at the pump outlet.

2. can be used in a system that is not very strictSafety valveUse。

The combination of 3. and pulsating damper decreaseswater hammerHarm to the system, reduce the peak value of flow velocity fluctuation, protect pipeline, elbow and joint from pressure fluctuation.
4. to create a good working environment for metering pumps and improve the performance of pumps
5. to ensure the stability of pump water flow, pump flow such as some big changes with pressure, can be set back pressure valve in the pump outlet, the pump output flow rate stability, then select the back pressure valve pressure pump the actual use of pressure or slightly less than the use of pump pressure.
6. in the pipeline or equipment vessel pressure unstable state, can maintain the pressure required by the pipeline, so that the pump can output flow normally.
7. in the pump outlet due to gravity or other effects often appear self or siphon phenomenon, back pressure valve to reduce the traffic generated by the siphon and pressure fluctuations, generally used when the pressure is greater than the liquid itself, such as to prevent the liquid level to 2 meters in the chest of the liquid flowing, backpressure valve selection pressure is greater than 0.02MPa, generally used 0.1MPa.
 

Three. Working principle

The fluid enters from the back pressure valve and is blocked by the diaphragm, so the fluid produces upward pressure on the diaphragm. When the pressure is large enough, the spring is compressed, the fluid rises from the diaphragm to form a channel and flows out from the outlet of the backpressure valve; if the fluid pressure is not enough, the pressure will be suppressed so that the inlet can be formedPressure riseUntil reachingRated pressureThe diaphragm forms a passage.

Back pressure valve rated pressure can be adjusted, usually by adjusting the upper end of the spring, so as to adjust the length of the spring to achieve.