McMaster-Carr

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	Pipe Size Pipe Size

1/8

2
2 1/2
3
4
5
6
8
10

	Thread Type Thread Type

NPT

NPTF

BSPP

	For Use With For Use With	Show

Argon

	For Use With For Use With	Hide

Warning: Products have one, but not necessarily all, of the selected characteristics.

	Connection Style Connection Style

	Threaded
	Barbed
	Flanged
	Socket Connect
	Push to Connect
	Yor-Lok
	Unthreaded
	Butt Weld

	Body Material Body Material

	Connection Type Connection Type


Pipe	Tube

	Valve Type Valve Type

Check

Vacuum Breaker

	Mounting Orientation Mounting Orientation

Horizontal

Vertical

Any Position

	Check Valve Type Check Valve Type

	Minimum Opening Pressure Minimum Opening Pressure

	Shape Shape

	Straight

	Gender Gender

Female

Male

	Maximum Pressure Maximum Pressure

	Seal Material Seal Material

	Maximum Temperature Maximum Temperature

	Minimum Temperature Minimum Temperature

	Flow Coefficient (Cv) Flow Coefficient (Cv)

0.1
0.2
0.22
0.25
0.3
0.4
0.47
0.5
0.6
0.7
0.75
0.85
1.1
1.15
1.2
1.21
1.4
1.47
1.6
1.68
1.85
1.954
2
2.09
2.1
2.2
2.3
2.4
2.87
3
3.1
3.3
3.48
3.53
3.584
3.9
4.2
4.3
4.4
4.48
4.6
4.7
5
5.2
5.24
5.4
5.5
5.7
6
6.01
6.1
6.463
6.56
6.6
7
7.2
8
8.1
8.86
9
9.088
10
11.9
12.5
12.7
13
15.67
16
17
18
18.8
19
20
21.83
22
26
28
30
31
32
33.3
37.84
38
39
42.5
44
49
50
52
54
56
59
60
63
64
65
69
72
76
77
81
89
92
94
100
130
131
144
150
170
185
191
192
240
280
297
340
390
520
850
1,600
2,400
Not Rated

	Valve Function Valve Function

Backflow Prevention

	Actuation Actuation

Pressure

Vacuum

	Connection Connection

Inlet

Outlet

	Fitting Type Fitting Type

Connector

Adapter

Insert

	System of Measurement System of Measurement

Inch

Metric

	End-to-End Length End-to-End Length

	Spring Material Spring Material

Stainless Steel

Plastic

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315 Products

About Backflow-Prevention Valves

Threaded Check Valves

For use with threaded pipe, these valves are available with NPT, NPTF, BSPP, and UNF connections.

High-Flow Threaded Check Valves

To achieve the maximum possible flow, internal components are designed to reduce flow resistance.

Plastic Threaded Check Valves

Plastic provides a lightweight alternative to metal.

High-Temperature
Threaded Check Valves

The heat-resistant rubber seal withstands temperatures up to 500° F.

High-Pressure
Threaded Check Valves

Rated for up to twice the pressure of standard check valves, these can withstand pressures up to 2,000 psi.

High-Cycling Threaded Check Valves

With few moving parts to wear out, these valves withstand frequent opening and closing, pulsating flow, and rapid flow reversal.

Check Valves with Barbed Fittings

Barbs grip onto tubing, providing a secure hold.

Heavy Duty Check Valves
with Barbed Fittings

For more durability than plastic barbed check valves, these have a stainless steel body.

Flange-Mount Check Valves

Sandwich these valves between two ANSI flanges for backflow prevention at a fraction of the weight of flanged check valves and a reduced pipeline footprint.

Compact Flange-Mount Check Valves

Less than half the end-to-end length of standard flange-mount check valves, these can be installed in pipelines with limited clearance.

Check Valves with Yor-Lok Fittings

Two sleeves give the fittings extra gripping power. They bite into tubing as you tighten the nut to form a strong seal. All are compatible with Swagelok®, Let-Lok, and Parker A-Lok fittings.

Socket-Connect Check Valves

Weld to unthreaded metal pipe.

Check Valves with
Push-to-Connect Fittings

Insert tubing into the fitting—no heat, solder, or flux required.

Butt-Weld Check Valves

Weld these valves to unthreaded pipe for a smooth, flush connection that provides maximum flow.

Union-Insert Check Valves

To reduce installation time and allow for maintenance without detaching pipe connections, these valves insert into a union fitting.

Check Valves with Barbed
Fittings for Harsh Chemicals

Barbs grip onto tubing, providing a secure hold.

Check Valves with Push-to-Connect
Fittings for Harsh Chemicals

Insert tubing into the fittings—no heat, solder, or flux required.

Threaded Check Valves for Vacuum

Valves have NPT connections for use with threaded pipe.

Vacuum-Breaking Valves

Commonly used with irrigation systems and laboratory equipment, these valves have NPT connections.

High-Pressure
Vacuum-Breaking Valves

Rated for 12 times the pressure of standard vacuum-breaking valves, these can handle up to 1,500 psi. Connections are NPT.

Vacuum-Breaking
Valves for Chemicals

A plastic body withstands pH neutralizing, cleaning, and plating solutions containing sodium hydroxide, methyl ethyl ketone, and other harsh chemicals.

Terms and Conditions and Privacy Policy

About Backflow-Prevention Valves

Check Valves

Threaded Check Valves

High-Flow Threaded Check Valves

Plastic Threaded Check Valves

High-TemperatureThreaded Check Valves

High-PressureThreaded Check Valves

High-Cycling Threaded Check Valves

Check Valves with Barbed Fittings

Heavy Duty Check Valveswith Barbed Fittings

Flange-Mount Check Valves

Compact Flange-Mount Check Valves

Check Valves with Yor-Lok Fittings

Socket-Connect Check Valves

Check Valves withPush-to-Connect Fittings

Butt-Weld Check Valves

Union-Insert Check Valves

Check Valves with BarbedFittings for Harsh Chemicals

Check Valves with Push-to-ConnectFittings for Harsh Chemicals

Threaded Check Valves for Vacuum

Vacuum-Breaking Valves

Vacuum-Breaking Valves

High-PressureVacuum-Breaking Valves

Vacuum-BreakingValves for Chemicals

High-Temperature
Threaded Check Valves

High-Pressure
Threaded Check Valves

Heavy Duty Check Valves
with Barbed Fittings

Check Valves with
Push-to-Connect Fittings

Check Valves with Barbed
Fittings for Harsh Chemicals

Check Valves with Push-to-Connect
Fittings for Harsh Chemicals

High-Pressure
Vacuum-Breaking Valves

Vacuum-Breaking
Valves for Chemicals