LEOPARD flow limiter hydraulic diaphragm valve. The flow limiting valves allow to limit the flow of circulating water, ensuring that it is equal to or less than adjusted.
Leopard flow limiter valves are available from DN 20 to DN 300 diameter.
Applications
The installation of limiter flow control valves allows to:
The flow limiting valves allow to limit the flow of circulating water, ensuring that it is equal to or less than adjusted.
Functioning
The pilot regulates the opening of the valve according to the differential pressure, providing the pre-set flow rate and keeping the flow constant. By actuating the screw of the pilot’s tare it is possible to vary the flow rate.
By two sensors, installed on both sides of an orifice plate that produces a certain pressure drop, the circulating flow is obtained, closing the hydraulic valve partially until only allowing the determined flow if this flow is to be exceeded. After preselecting the flow to be limited, the pilot is able to modify the flow rate set at ± 15%. Turing the limiter pilot clockwise you will allow a higher glow. Turing the pilot anti-clockwise you will reduce the flow.
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.
