Note : * Recommended seal kit. * & ** Recommended spare kit.
            While ordering the individual spares / spare kit / seal kit, give part no. and complete details of model code
            as on the label / body.

MODEL : CI

Operation and Maintenance Instructions :

Polyhydron make Pilot Operated Check Valves are reliable hence require very little attention from user. However it is necessary that following points must be kept in mind while storage, operation, commissioning and maintenance.

Storage :

During storage take care that this valve is properly covered and well lubricated. This will prevent ingress of dust and dirt in working mechanism and during commissioning it will be easy to install the same.

Operation :

The Pilot Operated Check valve has two distinct sections: the check valve section and the pilot section. The check valve allows free flow from port ‘A’ to port ‘B’ while checking the flow from "B’ to ‘A’, sealing without leakage. When it is necessary to allow the flow from port ’B’ to port ‘A’, the valve can be piloted open by supplying the pilot pressure signal at port ‘X’. Pilot pressure works over the area of pilot piston and forces the piston rod against the check valve poppet. This unseats the poppet, allowing free flow from port ‘B’ to port ‘A’.

Decompression feature enables the valve to open in two stages progressively allowing smooth and rapid exhaust of compressed oil.

The pilot operated check valves are available with both internal and external drain facility. The valves with internal drain are available with different pilot ratios.

Commissioning :

During commissioning, the Pilot Operated Check Valve does not need any special attention. But following points are to be kept in mind:

Inlet line is to be connected to port ‘A’ and ports ‘B’ is connected to the outlet. The port ‘X’ is connected to the pilot pressure. In case of external drain type valve the port ‘Y’ is connected to tank.

See whether the proper O' rings are used or not.

Cap screws and the corresponding tightening torque should be as mentioned in the data sheet.

Maintenance :

The Pilot Operated Check Valve does not need any major attention, but to ensure its efficient working and long life of the valve it is necessary that the following points kept in mind:

The oil must be of prime quality and clean as per ISO code 16/13.

Care should be taken that the oil should be periodically changed. The use of Contaminated oil may cause damage to the seat and wear of the piston / piston pin which leads to leakage.

The O' rings at the port openings must be checked periodically.

The oil temperature must be within the specified range i.e. -20 °C to +70 °C.

Updated on February 04, 2015 03:05 pm .