The correct way to set the drive pressure for a mechanical pump is to drive the pressure higher than the back pressure of 1-1.5kg / cm2 (15-20psig). This is correct in most cases. But sometimes in order to achieve the displacement of the pump, you need to set the driving pressure slightly higher. When the driving pressure is high, the downside is that it easily causes wear on the intake valve. If the driving pressure is higher than the required value, the intake valve will cause serious wear and tear and had to replace the intake valve in advance. In this case, it is recommended to use a pressure reducing valve or a pressure reducing valve station. The pressure relief valve allows both the drive pressure to be set at a set pressure that meets the pump displacement and protects the intake valve from wear. In addition, when the application space is more narrow, it is recommended to use a relief valve with a steam pipe. During pumping, the manifold supplies the pump to provide a buffer for the pump. This buffer softens the entire device and reduces wear and tear on the pressure relief valve.

Automatic Sliding Door Operators

High quality door residential automatic door opener

Carton+Foam+Bubble Bag and Pallet


Safety & Operation Devices of High Speed PVC Roll up Door:

In consideration of operation safety for high speed PVC roll up door, we provide the photo cell, and wireless safety airbag device as the standard safety device; And to enrich the operation methods of the high speed door, various options are provided such as manual button, transmitter, control box, radar sensor and inductive loop device. Different styles of transparent window are also available for better vision view.

Varied Running Speed of High Speed PVC Roll up Door:

Running speed of High Speed PVC Roll up Door is adjustable: Opening speed from 0.80m/s to 2.0m/s, and closing speed from 0.6m/s to 1.0m/s. Running speed adjustment can be achieved through inverter inside the control box, t to meet the actual needs.

Driving System of High Speed PVC Roll up Door:

Driving system is the core part for the high speed roll up doors. For the motors, we can provide multiple options for different demands, brands including SEW, SIEMENS, SNMA, SEJ and Servo Motor; All the motors are provided with manual brake, that offers emergency operation under power failure. Furthermore, motor power can be applied based on the real door size, in supply voltage 220V single phase and 380V three phase.


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SHENZHEN HONGFA AUTOMATIC DOOR CO., LTD , https://www.hongfahsrs.com