Plumbing and heating valve symbols

For reference purposes, here are some two dimensional plumbing symbols illustrating valves and mechanical devices. All drawn by me using paint.net. If there are any other symbols you would like to see just ask on the forum.

Gate valve symbol Gate valve
Isolating valve symbol Isolating valve
Globe valve symbol Globe valve
Ball valve symbol Ball valve
4 way valve 4 way valve
backflow preventer symbol Backflow preventer
Check valve symbol Check valve
Drain valve symbol Drain valve
Air separator symbol Air separator
3 way mixing valve symbol 3 way mixing valve
Diverting 3 way valve symbol Diverting 3 way valve
flow check valve symbol Flow check valve
Manual air vent symbol Manual air vent
Motorized valve symbol Motorized valve
Pressure reducing valve symbol Pressure reducing valve
Pressure balancing bypass valve symbol Pressure balancing bypass valve
Pressure relief valve symbol Pressure relief valve
Spring loaded check valve symbol Spring loaded check valve
Motorized 3 way valve symbol Motorized 3 way valve
Motorized 4 way valve symbol Motorized 4 way valve
Thermostatic valve symbol Thermostatic valve
Thermostatic 3 way valve symbol Thermostatic 3 way valve
Circulator symbol Circulator
Circulator with isolating flanges symbol Circulator with isolating flanges
Expansion tank symbol Expansion tank
Floating air vent symbol Floating air vent
Pressure gauge symbol Pressure gauge
Temperature gauge symbol Temperature gauge
Thermo-pressure gauge symbol Thermo-pressure gauge
Post indicator valve symbol Post indicator valve
Float operated valve symbol Float operated valve symbol
3 way plug valve symbol 3 way plug valve symbol
Diaphragm valve symbol Diaphragm valve symbol
Butterfly valve symbol Butterfly valve symbol
Powered valve symbol Powered valve symbol
Reducing valve symbol Reducing valve symbol
Needle valve symbol Needle valve symbol
Flanged valve symbol Flanged valve symbol