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Pneumatic Components > Special Purpose Pneumatic Fittings > Check Valves & Stop Valves

In Depth

Check Valves & Stop Valves

NITRA check valves allow air flow in one direction and block air flow in the reverse direction. Pilot-operated check valves work as a normal check valve until pressure is applied to the pilot port allowing reverse flow. Stop valves block upstream air pressure when the downstream pneumatic tube is removed from the fitting. Models are available with push-to-connect and/or threaded fittings.

Flow Control Valves - Speed Controllers

Quick Exhaust Valves

Hand Valves

Pressure Regulators / Gauges / Indicators

Check Valves & Stop Valves

Shuttle Valves

Bleed Valves

Accessories for Special Purpose Pneumatic Fittings

Check Valves & Stop Valves

Push-to-Connect and Threaded Pneumatic Fittings

NITRA Union Straight Check Valves
NITRA Pilot Operated Check Valves
NITRA Union Straight Stop Valves

NITRA Union Straight Check Valves

Check flow valves allow air flow in one direction and block air flow in the reverse direction. NITRA air pneumatic push-to-connect Check Valve fittings have tough thermoplastic bodies and stainless steel tube gripping claws.

Inch and metric pneumatic check valve fitting sizes available
Release rings are color coded to differentiate between inch (black) and metric (blue) sizes
For use with polyurethane tubing or nylon tubing
NITRA Polyurethane tubing and Nylon 12 tubing is easily connected by simply inserting the pneumatic tubing end into the fitting. To release the tubing, press the circular release ring and the tubing can be easily pulled out.
Five fittings per package

NITRA check valves start at
$31.00 (package of 5)
(CVU532)

NITRA Check Valves Overview

NITRA Union Check Valves - Threaded Nickel-plated Brass ... New!

All valve bodies are nickel-plated brass. These high quality check valves work well in pneumatic circuits requiring free flow in one direction and no flow in the opposite direction.

Multiple porting options
Durable brass construction
Low cracking pressure (less than 1 psi)
Compact in-line or port mounting styles
(2) #10-32 female threaded connections
(2) 1/8in female NPT connections
(1) 1/8in female NPT to (1) 1/8in male NPT connections
(1) 1/8in male NPT to (1) 1/8in female NPT connections

NITRA nickel-plated brass check valves start at
$5.50 (each)
(CVU10N)

NITRA Check Valves Overview

NITRA Pilot Operated
Check Valves ... New!

These valves are designed for use in applications requiring an actuator to be locked in position. They work as a normal check valve (free flow from inlet to outlet, no flow outlet to inlet) until pressure is applied to the pilot port to allow free flow from outlet to inlet.

Swivel input port
Direct cylinder mount
Plated for corrosion resistance
Low cracking pressure
Thread sealant standard on output ports

Pilot operated check valves start at
$25.00 (each)
(POC14-14N)

NITRA Check Valves Overview

NITRA Union Straight Stop Valves

NITRA pneumatic push-to-connect Air Stop Valve fittings have tough thermoplastic bodies and stainless steel tube gripping claws. When the downstream pneumatic tube is removed from the stop valve, upstream air pressure is blocked.

Release rings are color coded to differentiate between inch (black) and metric (blue) sizes
For use with polyurethane tubing or nylon tubing
NITRA Polyurethane tubing and Nylon 12 tubing is easily connected by simply inserting the pneumatic tubing end into the fitting. To release the tubing, press the circular release ring and the tubing can be easily pulled out.
Five fittings per package

NITRA stop valves start at
$29.00 (package of 5)
(SVU532)

NITRA Stop Valves Overview