LEOPARD pressure relief hydraulic diaphragm valve. The valve is designed to open automatically if the installation exceed a maximum settled pressure.
Leopard pressure relieve valves are available from DN 20 to DN 300 diameter.
Applications
The relief valve is designed to open in case of exceeding a preset maximum pressure. This valve is installed with outlet to the atmosphere, relieving by opening the overpressure in the pipe.
Functioning
If the upstream pressure exceeds the setting pressure, the piston is moved upwards by communicating the valve chamber and the atmospheric pressure. In this way the valve opens to reduce excess pressure.
Turning the pilot screw clockwise you will increase the opening settled pressure. Turing the pilot anti-clockwise you will reduce the opening settled pressure. Through the pilot the chamber of the valve will drain.
For correct operation of the hydraulic valve and to avoid problems, the following conditions must be taken into account:
1- Why does not the valve open?
There may be insufficient pressure at the inlet pressure valve, you should examine the insulation valves of the system upstream and downstream, if they are closed open to allow the passage of water and generate pressure.
Another reason may be that the solenoid is calcified, clean it and replace parts as necessary.
2- Why does not the valve regulate at the desired control point?
It may be caused by the pilot because it is not adjusted properly, check it by tightening and loosening the screwdriver to see if there is a pilot reaction, so you can adjust the pilot to the desired opening and closing speed.
Check if the upstream filter is clogged and causes insufficient pressure to reach the pilot to activate the valve at the desired control point.
3- Why does not the valve close?
It may be that the filter is clogged, to check it, disconnect the copper line from the lid to see if there is water flow in the inlet. In this case clean the filter mesh.
If the main valve membrane fails, it can also give this result, replace the membrane for repair.
Another reason may be that the solenoid is calcified, clean it and replace parts as necessary.
4- Why does the membrane leak water?
It is usually produced by the accumulation of dirt between the membrane and its closing support, closing the valve manually, if the problem persists open the valve to clean the area.
