A76D Pump Control Valve – Double Chamber (Active Protection)

A76D Pump Control Valve – Double Chamber (Active Protection)

Alpine Catalogue: ALPINE ACV

Certification: WRAS

A76D – A active protection for pump control

The A76D is included two pcs of 3-way latch solenoid valves. 4-1 is to control the mid-chamber and 4-2 is to control the upper chamber. 7-1 and 7-2 are accelerators to increase the opening/closing speed and
they are controlled by related latch solenoid valves.

How does the A76D work?

Pump start :
The 4-2 will actuate the 7-2 accelerator to let the upper chamber connect to the valve outlet. The 4-1 will actuate the 7-1 accelerator to let inlet water fill into the middle chamber to push up the diaphragm to the top position. The PLC can set a delay timer when to actuate the solenoid valve to avoid water hammer.

Pump Stop:
The 4-2 will actuate the 7-2 accelerator to let the upper chamber connect to the valve inlet. The 4-1 will actuate the 7-1 accelerator to let the middle chamber connect to the atmosphere. The PLC should monitor the
indicator. When the valve is fully closed, then stop the pump to do active protection.
Electricity stopped
The valve will perform as a check valve to prevent water backflow.

Internal Check Options:
Option 1: Quick close 100%.
Option 2: It will block 90% of the flow area quickly and close slowly at the last 10% stroke.
* DN50-DN150 is for slow closing only.