The valve is designed for installation in the sea water circuit of the refrigerant condenser downstream of the condenser, the piping arranged so that the valve can either discharge water overboard or re-circulate water to the pump suction or proportion the incoming flow of water to both the overboard and re-circulation branches in accordance with the gas pressure in the refrigerant condenser.

The valve may be installed in any attitude, gravity having no effect on its operation.

The mounting of the valve should be such that it is not subject to excessive vibrations under running conditions. In positioning the valve, a clear space approximately equal to the valve body length is required to withdraw the rotor and in way of the actuator, spaces equal in length to the gas cylinder and the spring assembly are required for easy dismantling.

A degree of flexibility in at least one of the connecting pipes is desirable although, if care is taken on installation, not essential.  Mounting of the valve should be such that it is not subjected to excessive loading or vibration under running conditions.  Temperature variations, pipe expansion and movement of the ship's hull should be taken into account when designing the piping runs and supports.

Two tapped holes are provided in the end of the gas cylinder, one for connection to the refrigerant condenser and one spare for bleeding purposes and pressure gauge if required.  The connection between the gas cylinder and the refrigerant condenser need be no greater than 1/8" (3mm) bore diameter.