Zero-Loss Drain Valves | McMaster-Carr

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5 Products

Energy-Saving Compressed Air Drain Valves


Air Powered—1 gpm Discharge Capacity	Air Powered—1.5 gpm Discharge Capacity	Air Powered—3.5 gpm Discharge Capacity

Electric—0.2 gpm Discharge Capacity	Electric—2.9 gpm Discharge Capacity

Save energy by minimizing the loss of compressed air. Unlike other drain valves, these only open when they're full. They close before the reservoir is completely empty, so no air escapes from the system. Install them at low points in your air line after separators, dryers, filters, and aftercoolers.

Air Powered—Air-powered valves don’t need to be plugged into an electrical outlet. When water raises the float to a set point, these valves open. They have a simple internal design and large openings to prevent clogs.

Electric—Electric valves have a sensor. When condensate inside the valve rises to the level of the sensor, the valve opens to drain. Valves detect when they’re blocked—they automatically open and close to attempt to remove the blockage and sound an alarm if they’re still blocked.

1/8 Pipe Size Air Pilot and 1/4 Pipe Size Air Pilot—Drain valves with an air pilot require an additional line of air to operate. Install a 5-micron particle filter (sold separately) before the 1- and 3.5-gpm capacity valves.

Contact for Remote Signaling Device—Drain valves with a contact for remote signaling device can be wired to activate a remote alarm if blocked.

	Inlet			Outlet							Air Pilot			Overall
	Pipe Size	Thread Type	Gender	Connection	For Tube ID	Pipe Size	Thread Type	Gender	Discharge Cap., gpm	Max. Pressure, psi	Pipe Size	Thread Type	Gender	Ht.	Wd.	Dp.	Max. Temp., ° F	Features		Each
Aluminum Housing







				Air Powered

				1/2	NPT	Female	Threaded	—	1/2	NPT	Female	1	200	1/8	NPT	Female	7 3/8"	8 1/4"	5 7/8"	130	Resevoir Window	6773K43	0000000


				1/2	NPT	Female	Threaded	—	1/2	NPT	Female	1.5	170	1/4	NPT	Female	11"	9 1/4"	10 1/2"	130	Clear Resevoir, Particle Filter	6773K42	00000000
				3/4	NPT	Female	Threaded	—	1/2	NPT	Female	3.5	250	1/8	NPT	Female	8 1/2"	13 5/8"	9 1/8"	180	Clear Resevoir	6773K44	00000000




						Electric, 120V AC—Hardwire

						1/2	NPT	Female	Barbed	1/4"	—	—	Male	0.2	230	—	—	—	2 7/8"	4 7/8"	3 5/8"	120	Alarm	6773K46	000000




								Electric, 120V AC—3-Blade Plug

								1/2	NPT	Female	Barbed	3/8"	1/4	NPT	Male	2.9	230	—	—	—	4 1/2"	3 3/8"	7"	120	Alarm, Contact for Remote Signaling Device	6773K21	000000