Symbols / Direction of flow
Flow in control mode
On/Off PICV VQP46..
On/Off PICV VQI46..
The valves should preferably be mounted in the return pipe where temperatures are lower and where the sealing gland is less affected by strain.
Symbol used in catalogs and application descriptions
Symbol used in diagrams
There are no standard symbols for PICVs in diagrams.
A strainer or dirt trap should be fitted upstream of the valve to enhance reliability. Remove dirt welding beads, etc. from valves and pipes.
Do not insulate the actuator bracket, as air circulation must be ensured!