Universal Socket Weld Check Valve Style – US

The Universal Socket Weld (US) check valve is a one-piece body machined from bar stock with socket weld ends and designed for a minimum pressure drop. It carries rugged, dependable Check-All trim and there are a wide variety of seat materials and cracking pressures to choose from. This valve series is particularly attractive when weld joints are required. The socket ends are machined to ASME/ANSI B16.11 dimensions.
Note: Please take precautionary measures when welding to prevent heat build-up and possible damage to the valve seat.

Size & Dimension

Nominal Pipe Size	Size Code	A	B*	C**	D**	Orifice Diameter
3/8	C	2.16	1-1/8	0.695	0.385	0.348
1/2	D	2.71	1-5/16	0.860	0.385	0.464
3/4	F	2.95	1-5/8	1.070	0.505	0.593
1	H	3.64	2-1/4	1.335	0.505	0.890
1-1/4	I	3.91	2-3/4	1.680	0.505	1.135
1-1/2	J	4.36	3-1/4	1.920	0.505	1.385
2	K	5.85	3-1/2	2.411	0.625	1.555
2-1/2	L	5.00	3-3/4	2.919	0.625	1.555
3	M	5.44	4-1/2	3.545	0.625	2.025
4	N	6.80	5-1/2	4.550	0.755	2.560

NOTES (DIMENSIONS TABLE)*May be larger.
**Sockets per ASME/ANSI B16.11.Consult factory for more information.

Available Materials

* 316/316L Stainless Steel (SS)	* Alloy B (HB)
* Alloy 20 (A2)	* Alloy C-276 (HC)
* Carbon Steel (CS)	* Alloy 400 or MONEL® (MO)

Pressure Temperature Rating

Body Materials	Availability	Non-Shock Pressure	-Temperature Rating
316/316L Stainless Steel (SS) Carbon Steel (CS)	Standard	3/8" - 2-1/2" 5000 PSIG @ 100°F (1500 PSIG for o-ring seats)	3" 3000 PSIG @ 100°F (1500 PSIG for o-ring seats)	4" 1500 PSIG @ 100°F
Alloy 20 (A2)	Semi-standard
Alloy C-276 (HC)
Alloy 400 or MONEL® (MO)
Alloy B (HB)	Contact the factory for these or other materials.

Seat material and spring material selection may limit the recommended service temperature.
See seat ratings, spring ratings, and body material ratings for their respective recommended service temperatures.
Consult the factory for reduced P-T rating above 100 °F. Standard spring material is 316 Stainless Steel.

Flow Data

PRESSURE DROP PSI

Size	Cv
3/8	1.9
1/2	4.3
3/4	7.2
1	11.0
1-1/4	19.0
1-1/2	31.9
2	42.0
2-1/2	50.0
2	89.0
4	140

FOR WATER AT 72°F

WATER FLOWRATE - GPM

Note: All flow curves and Cv values presume the valves are fully open with 1/2 PSI cracking pressure springs. Consult the factory for more information.

Valve Weights

SIZE	PART NUMBER	SS, CS & Alloys
3/8	USC	7.2 oz.
1/2	USD	11.5 oz.
3/4	USF	1.2 lb.
1	USH	3.1 lb
1-1/4	USI	4.9 lb.
1-1/2	USJ	7.4 lb.
2	USK	9.8 lb.
2-1/2	USL	8.8 lb.
3	USM	13 lb.
4	USN	22.3 lb.

Valve weights are approximate.

Seat & Cracking Pressure Options

Valve Style	Size Range	Body Materials Other Options	Allowable Seat Materials Other Options	Standard Cracking Pressures Other Options More Info.	Standard Spring Material More Info.
US	3/8" - 1-1/4"	3/8" - 1-1/4"	AFLAS® EPDM "Metal to Metal" PTFE Buna-N Kalrez® Neoprene Viton®	1/8 PSI 1/2 PSI 1.5 PSI 3.5 PSI	316 SS
US	3/8" - 1-1/4"	C. Steel	AFLAS® Buna-N Kalrez® "Metal to Metal" Neoprene PTFE Viton®	1/8 PSI 1/2 PSI 1.5 PSI 3.5 PSI	316 SS
US	1-1/2" - 2"	316L SS	AFLAS® Buna-N EPDM Kalrez® "Metal to Metal" Neoprene PTFE Viton®	1/8 PSI 1/2 PSI 1.5 PSI	316 SS
US	1-1/2" - 2"	C. Steel	AFLAS® Buna-N Kalrez® "Metal to Metal" Neoprene PTFE Viton®	1/8 PSI 1/2 PSI 1.5 PSI	316 SS
US	3/8" - 2"	Alloy 20 Alloy C-276	AFLAS® Buna-N EPDM Kalrez® "Metal to Metal" Neoprene PTFE Viton®	1/2 PSI	Alloy C-276
US	3/8" - 2"	Alloy 400 or MONEL®	AFLAS® Buna-N EPDM Kalrez® "Metal to Metal" Neoprene PTFE Viton®	1/2 PSI	Alloy 400 or MONEL®
US	3/8" - 2"	Alloy B	AFLAS® Buna-N EPDM Kalrez® "Metal to Metal" Neoprene PTFE Viton®	1/2 PSI	Alloy B