Pneumatic Fittings

Check-Valve Fittings

KCC, KCU, KCV and KCL check-valve fittings allow airflow in one direction and block reverse flow. Straight and angled bodies connect these functions directly into pneumatic tubing.

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One-way airflowReverse-flow preventionStraight and angled bodies

Product features

Check valves allow airflow in one direction and prevent reverse flow.
Straight and angled bodies place the check function directly in pneumatic tubing connections.

Construction and materials

Check-valve fitting cross-section and component materials

O-ring: NBR
Tube seal: NBR
Back ring: POM
Collar: Zinc alloy
Locking claws: Stainless steel
Release sleeve: POM
Valve element: Not specified
Valve spring: Not specified
Body: Not specified
Valve seat: Not specified
Tubing shown: Nylon or polyurethane

Technical specifications

Fluid: Air only; no other gases or liquids
Operating pressure: 0–0.9 MPa
Negative pressure: −750 mmHg
Operating temperature: 0–60 °C
Compatible tubing: Polyurethane and nylon

Tighten threaded connections to the specified torque. Overtightening can prevent the valve from operating correctly.

Ordering code

KCC06-01B

KCCSeries: KCC male straight check-valve fitting.
06Tube outside diameter: 6 mm tube outside diameter in this example.
01Thread size: R1/8 thread in this example.
BFlow direction: Tube to thread; omit B for thread to tube.

Check-valve flow-direction suffixes

Suffix	Flow direction	Direction label
Blank	Thread to tube	Meter IN
B	Tube to thread	Meter OUT

The flow-direction illustrations cover KCC and KCCF connections.

Check-Valve Fittings • Product specifications

Check-Valve Fittings: Technical specifications

KCC - Male straight check-valve fitting; black — KCC — Male straight check-valve fitting; black

Model specifications

Series 01

Series: KCC Male straight check-valve fittings
Applicable tubing: Polyurethane and nylon

A male-threaded straight check valve allows airflow in one direction and blocks reverse flow.

Technical specifications

Operating data

Fluid: Air
Operating pressure: 0-0.9 MPa
Operating temperature: 0-60 °C
Applicable tubing: Polyurethane and nylon
Vacuum rating: −750 mmHg
Flow direction: No suffix: thread to tube; B suffix: tube to thread

KCC - Male straight check-valve fittings dimensions (mm)

Model	ΦD	thread	L1	L2	ΦP	Hex
KCC04-M5	4	M5	3.5	20	10	10
KCC04-M6	4	M6	4.5	21	10	10
KCC04-01	4	R1/8	7	23.3	10	10
KCC06-01	6	R1/8	7	25.5	12	12
KCC06-02	6	R1/4	9	26.5	12	14
KCC08-01	8	R1/8	7	33.2	14	14
KCC08-02	8	R1/4	9	35.2	14	14
KCC08-03	8	R3/8	9.5	35.7	14	17
KCC10-02	10	R1/4	9	47.7	17	17
KCC10-03	10	R3/8	9.5	48.2	17	17
KCC10-04	10	R1/2	11	49.7	19	21
KCC12-02	12	R1/4	9	47.7	19	19
KCC12-03	12	R3/8	9.5	48.2	19	19
KCC12-04	12	R1/2	11	49.7	19	21

Technical overview

Check-Valve Fittings series specifications

Functions, dimensions, operating ranges and connections across the product series.

4 related series

Series	function	Tube size	Thread port	Pressure range	Material	Tube media
KCC Male straight check-valve fittings	Straight Fitting	Polyurethane and nylon	M5, M6	0-0.9 MPa	-	Air
KCU Inline check-valve unions	-	Polyurethane and nylon	-	0-0.9 MPa	-	Air
KCV Elbow check-valve unions	Elbow Fitting	Polyurethane and nylon	-	0-0.9 MPa	-	Air
KCL Male elbow check-valve fittings	Elbow Fitting	Polyurethane and nylon	-	0-0.9 MPa	-	Air