Nominal Pipe Size Size Code A Hex Size B* C D Orifice Diameter 1/2 D 2.34 7/8 0.28 1/2 NPT 0.348 3/4 F 2.34 1-1/8 0.27 3/4 NPT 0.464 1 H 3.00 1-3/8 0.35 1 NPT 0.593 1-1/4 I 3.00 1-3/4 .033 1-1/4 NPT 0.890 1-1/2 J 3.19 2 0.32 1-1/2 NPT 1.135 2 K 3.68 2-1/2 N/A 2 NPT 1.385 2-1/2 L 5.00 3-1/4 N/A 2-1/2 NPT 1.555 3 M 5.50 4 N/A 3 NPT 2.025 4 N 5.00 4-1/2 N/A 4 NPT 2.560 NOTES (DIMENSIONS TABLE) *May be larger and/or round.

* 316 Stainless Steel (SS) * Alloy B (HB) * Alloy 20 (A2) * Alloy C-276 (HC) * Brass (BR) * Alloy 400 or MONEL® (MO) * Carbon Steel (CS) * Titanium (TI)

SIZE PART NUMBER ALL MATERIALS 1/2 CND 2.5 oz. 3/4 CNF 3.9 oz. 1 CNH 7.5 oz. 1-1/4 CNI 10.9 oz. 1-1/2 CNJ 1.5 lb. 2 CNK 2.7 lb. 2-1/2 CNL 5.0 lb. 3 CNM 8.9 lb. 4 CNN 11.1 lb. Valve weights are approximate.

Male Threaded Check Valve for MNPT pipe connections

The Connector (CN, CR) valve is a spring loaded check valve with a pipe nipple or connector housing. It is designed to be used in installations where a check valve with male pipe threads are required. The Connector check valve is adaptable for use as vacuum breaker, or low-pressure relief valve. Two valves used in combination make an excellent pressure vacuum vent. NPT threads are per ASME B1.20.1. This spring check valve is also available with ISO 7 “R” threads (CR) making it easily adaptable to any male threaded pipe connection.

Size & Dimension

Nominal Pipe Size	Size Code	A	Hex Size B*	C	D	Orifice Diameter
1/2	D	2.34	7/8	0.28	1/2 NPT	0.348
3/4	F	2.34	1-1/8	0.27	3/4 NPT	0.464
1	H	3.00	1-3/8	0.35	1 NPT	0.593
1-1/4	I	3.00	1-3/4	.033	1-1/4 NPT	0.890
1-1/2	J	3.19	2	0.32	1-1/2 NPT	1.135
2	K	3.68	2-1/2	N/A	2 NPT	1.385
2-1/2	L	5.00	3-1/4	N/A	2-1/2 NPT	1.555
3	M	5.50	4	N/A	3 NPT	2.025
4	N	5.00	4-1/2	N/A	4 NPT	2.560

NOTES (DIMENSIONS TABLE)*May be larger and/or round.

Available Materials

* 316 Stainless Steel (SS)	* Alloy B (HB)
* Alloy 20 (A2)	* Alloy C-276 (HC)
* Brass (BR)	* Alloy 400 or MONEL® (MO)
* Carbon Steel (CS)	* Titanium (TI)

Pressure Temperature Table

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

Flow Data

PRESSURE DROP PSI

Size	Cv
1/2	2.3
3/4	4.3
1	6.5
1-1/4	10.2
1-1/2	18.3
2	32.7
2-1/2	49.2
3	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	ALL MATERIALS
1/2	CND	2.5 oz.
3/4	CNF	3.9 oz.
1	CNH	7.5 oz.
1-1/4	CNI	10.9 oz.
1-1/2	CNJ	1.5 lb.
2	CNK	2.7 lb.
2-1/2	CNL	5.0 lb.
3	CNM	8.9 lb.
4	CNN	11.1 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.
CN	1/2"- 1-1/2	316 SS Brass	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
CN	1/2"- 1-1/2	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
CN	2" - 4"	316SS Brass	AFLAS® Buna-N EPDM Kalrez® "Metal to Metal" Neoprene PTFE Viton®	1/8 PSI 1/2 PSI 1.5 PSI	316 SS
CN	2" - 4"	C. Steel	AFLAS® Buna-N Kalrez® "Metal to Metal" Neoprene PTFE Viton®	1/8 PSI 1/2 PSI 1.5 PSI	316 SS
CN	1/2" - 4"	Alloy 20 Alloy C-276	AFLAS® Buna-N EPDM Kalrez® "Metal to Metal" Neoprene PTFE Viton®	1/2 PSI	Alloy C-276
CN	1/2" - 4"	Alloy 400 or MONEL®	AFLAS® Buna-N EPDM Kalrez® "Metal to Metal" Neoprene PTFE Viton®	1/2 PSI	Alloy 400 or MONEL®
CN	1/2" - 4"	Alloy B	AFLAS® Buna-N EPDM Kalrez® "Metal to Metal" Neoprene PTFE Viton®	1/2 PSI	Alloy B