Purge Line Cupla

Quick couplings

The Nitto Kohki Purge Line Cupla is a specialised quick coupling in brass with NBR seal designed for purge-line applications. The current range covers one type: RE-PV-30, nominal size 30. This coupling is designed for applications where compressed-air lines and connected components must be purged or evacuated in a controlled manner without interrupting the main line.

⚙ Brass construction - corrosion-resistant for compressed air and compatible purge media

✓ NBR seal - sealed for purge-line service

↕ Nominal size 30 - designed for larger purge volumes and line cross-sections

✦ Type RE-PV-30 - specialised purge-line design in the established Nitto Kohki coupling system

Type	Nominal size	Material	Seal	Function
RE-PV-30	30	Brass	NBR	Purge line coupling

Typical applications: Purging of compressed-air lines during commissioning and maintenance, evacuation of line sections before cleaning procedures, applications in semiconductor, optics, and metrology with requirements for particle-free piping systems, and processes where residual gases or contaminants must be removed from pneumatic circuits.

Technical data from the manufacturer catalogue

Series	PURGE LINE CUPLA
Body material	Brass (Chrome plated)
Seal material	NBR
Max working pressure	1.0 MPa {10 kgf/cm2}
Working temperature	Nitrile rubber (NBR): -20 °C to +60 °C
Valve structure	One-way shut-off
Applicable fluids	Air
Vacuum service	Not suitable for vacuum application in either connected or disconnected condition.
Size range	Inlet R 1/2, outlet socket (PV-30SM)
Catalogue page	C01en-b, 54

Operating principle

On disconnection the valve in the socket closes the supply line. The fluid left in the plug escapes.

Connecting sequence of a ball locking quick connect coupling.

Residual pressure can be released by a mere lever turn. Very smooth connection/disconnection!
Single action, just push in the plug to connect regardless of internal pressure in socket.
No unpleasant noise of air pressure discharge and no hose whip motion on disconnection for safety operation.
Safe design - socket valve will not open or close unless plug is connected.
Even after connection, a lever turn will open/close valve with perfect control of air flow or line shut-off.
Enables simultaneous air supply to three outlets from a single air line. (A single outlet PURGE HI CUPLA is also available - see the pages of PURGE HI CUPLA for details.)

All models of the series

RE-PV-30 - Male thread inlet R 1/2, three outlet sockets

Model	Coupling part	Application	Brass (g)	øHex (WAF)	øInlet thread
RE-PV-30	Socket	R 1/2 inlet, three PV-30SM outlets	1090	22	R 1/2

Dimensions in millimetres. Values in brackets apply in the connected condition.

Legend: L = overall length; H = width across flats or outside dimension; D = socket outside diameter; A = hose barb length; C = sleeve dimension; T = thread or barb size; B = bore

Series comparison

Series	Max working pressure	Size range	Valve structure	Applicable fluids
PURGE LINE CUPLA	10 bar	Inlet R 1/2, outlet socket (PV-30SM)	One-way shut-off	Air
COMPACT ZEROSPILL CUPLA	10 bar	Thread 1/8 inch, 1/4 inch	Two-way shut-off (Spill Reduction)	Air, Water
CUPLA HOSE with FULL BLOW CUPLA	10 bar	Hose size ø5 mm×ø8 mm, ø6.5 mm×ø10 mm, ø8.5 mm×ø12.5 mm	One-way shut-off	Air
FLOW MONITOR	10 bar	Rc 3/8 and Rc 1/2	-	Water
ANTI-VIBRATION PLUG HOSE	15 bar	R 1/4 (SHA-3-2R), R 3/8 (SHA-3-3R)	One-way shut-off	Air
HI CUPLA BL	15 bar	1/4 inch, 3/8 inch, 1/2 inch (thread and hose barb); SN type for urethane hose: for 6.5 x 10 mm, 8 x 12 mm and 8.5 x 12.5 mm hose	One-way shut-off	Air, Water
FLATFACE CUPLA F35	350 bar	Thread 1/4 inch, 3/8 inch, 1/2 inch, 3/4 inch, 1 inch	Two-way shut-off (Spill Reduction)	Hydraulic oil
FLATFACE CUPLA FF	350 bar	3/8 inch, 1/2 inch, 3/4 inch, 1 inch (thread)	Two-way shut-off (Spill Reduction)	Hydraulic oil

Choose PURGE LINE CUPLA when one air line has to feed three outlets and residual pressure must be released before disconnection: the lever on each PV-30SM outlet socket opens and closes the valve even after connection, which the plain one-way shut-off siblings HI CUPLA BL, NUT CUPLA, LOCK CUPLA 200, HI CUPLA Two Way Type, ROTARY LINE CUPLA, ROTARY FULL BLOW LINE CUPLA, ROTARY PLUG and TWIST PLUG do not offer. For a single outlet with the same purge function, PURGE HI CUPLA is the counterpart. Its working pressure is 1.0 MPa {10 kgf/cm2}, so lines running at 1.5 MPa {15 kgf/cm2} call for one of the 1.5 MPa {15 kgf/cm2} series instead, and where two-way shut-off with reduced spillage is required, COMPACT ZEROSPILL CUPLA applies.

Body and seal materials

Body material
Brass (Chrome plated)

Seal material	Mark	Working temperature	Remarks
Nitrile rubber (NBR)	-	-20 °C to +60 °C	Standard material

Further catalogue data

Note	Value
Number of outlet ports	3
Pressure units	1.0 MPa / 10 kgf/cm2 / 10 bar / 145 PSI
Maximum tightening torque	Size (Thread) 1/2 inch: 30 Nm {306 kgf cm}
Minimum cross-sectional area	41 mm2
Flow direction	Fluid must run from the intake port to the outlet ports. Please refer to the flow directions (arrows) on the "Models and Dimensions".
Drawing callouts for RE-PV-30 (mm)	38, 16, (7), 14, (7), 28, ø6.5, 7, (58), (41), 50, 50, 39, (95), (24), 12, Hex.22(WAF), (206), 22, R 1/2
Flow rate	Pressure - Flow Characteristics graph, test fluid air: flow rate in m3/min (ANR) against pressure in MPa {kgf/cm2}, with curves for 1) 3 pieces of 30PH, 2) 2 pieces of 30PH, 3) 1 piece of 30PH. Graph scale 0 to 6.0 m3/min (ANR) over 0 to 0.7 MPa {7 kgf/cm2}.

Interchangeability and size groups

Interchangeable with plugs of HI CUPLA models 10, 17, 20, 30 and 40. Interchangeable with each models of NUT CUPLA series and HI CUPLA series. Please see page 21 for "HI CUPLA Series Interchangeability".

Safety and application notes

Before use, please be sure to read "Safety Guide" described at the end of this book and "Instruction Sheet" that comes with the products.

All technical data on this page is taken from the Nitto Kohki general catalogue Quick Connect Couplings C01en-b, page 54. The complete catalogue is available for download on this page.

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Quick connect coupling Purge Line Cupla RE-PV-30, brass - Nitto Kohki 329806609
€294.69

What are Purge Line Cupla quick couplings and which industrial applications require them?

Purge Line Cupla quick couplings from Nitto Kohki represent specialized pneumatic connectors designed for applications requiring controlled media purging and venting operations. These brass-bodied couplings with NBR sealing are primarily utilized in semiconductor manufacturing, pharmaceutical production lines, and precision assembly automation where contamination control is critical. The RE-PV-30 series enables rapid connection and disconnection while maintaining system integrity during purge cycles. Industries including electronics manufacturing, cleanroom operations, and medical device production rely on these couplings for their ability to provide leak-tight sealing during both operational and maintenance phases.

What technical specifications determine the selection of Nitto Kohki Purge Line Cupla couplings?

Selection of Purge Line Cupla couplings depends on operating pressure ratings typically ranging from 0.2 to 1.0 MPa, port size compatibility with standard pneumatic tubing, and material compatibility requirements. The brass construction with NBR sealing elements provides chemical resistance to standard pneumatic media including compressed air, nitrogen, and inert gases. Connection thread specifications following ISO 228 or NPT standards ensure proper system integration, while the coupling's flow coefficient determines pressure drop characteristics. Temperature operating range typically spans -10°C to +60°C for NBR seal variants, with media filtration requirements of ISO 8573 Class 3 or better for optimal seal performance.

Which international standards and certifications apply to Purge Line Cupla pneumatic couplings?

Purge Line Cupla couplings manufactured by Nitto Kohki comply with ISO 4414 pneumatic system safety standards and ISO 5675 quick coupling performance requirements for industrial applications. The brass materials conform to EN 12165 specifications for copper alloys in fluid handling systems, while NBR elastomer seals meet DIN 3771 dimensional standards and ISO 3601 O-ring groove specifications. Pressure vessel compliance follows EN 809 safety requirements for pneumatic equipment, and electromagnetic compatibility aligns with EN 61000 standards for industrial environments. Quality management certification under ISO 9001 ensures consistent manufacturing processes and dimensional accuracy across production batches.

How do different Purge Line Cupla variants differ in terms of construction and application suitability?

The RE-PV-30 Purge Line Cupla variant features brass body construction with NBR sealing specifically engineered for standard pneumatic applications requiring periodic system purging and media changeover capabilities. Different port configurations accommodate various tubing sizes from 6mm to 12mm outer diameter, while valve mechanism designs vary between manual operation and automatic shut-off functionality. Material combinations including stainless steel bodies with FKM seals are available for aggressive media applications, providing enhanced chemical resistance compared to standard brass-NBR configurations. Operating pressure ratings distinguish variants, with standard versions rated to 1.0 MPa and high-pressure variants capable of 1.6 MPa continuous operation.

What installation requirements and system compatibility considerations apply to Purge Line Cupla couplings?

Purge Line Cupla installation requires proper thread engagement following ISO 228-1 parallel thread specifications or NPT tapered thread standards depending on system configuration, with thread sealant application meeting DIN EN 751-3 requirements for pneumatic systems. System compatibility demands compressed air quality meeting ISO 8573-1 Class 3:4:3 minimum standards to prevent premature seal degradation and ensure reliable coupling operation. Connection torque specifications typically range from 15 to 25 Nm for brass fittings, while system pressure testing should follow EN 809 procedures at 1.5 times working pressure. Ambient temperature conditions must remain within -10°C to +60°C operational limits, and installation orientation should accommodate proper drainage of condensate from the coupling body.

What safety ratings and environmental specifications characterize Purge Line Cupla performance?

Purge Line Cupla couplings typically achieve IP54 ingress protection rating against dust and water spray when properly installed, making them suitable for industrial workshop environments and outdoor pneumatic installations. Operating pressure range spans 0.2 to 1.0 MPa continuous duty with proof pressure testing at 1.5 MPa according to ISO 4414 safety standards for pneumatic equipment. Temperature performance covers -10°C to +60°C for NBR seal variants, while brass body construction provides corrosion resistance meeting EN 12165 specifications for industrial atmospheres. Safety factor calculations follow EN 809 requirements with minimum 4:1 burst pressure ratio, and cyclic pressure testing validates 1 million cycle minimum service life under normal operating conditions.

What maintenance intervals and inspection procedures ensure optimal Purge Line Cupla service life?

Purge Line Cupla maintenance requires quarterly visual inspection of coupling body and seal integrity, with annual replacement of NBR sealing elements in high-cycle applications exceeding 10,000 connections per year. Service life typically extends 5-7 years under normal operating conditions when compressed air quality meets ISO 8573-1 Class 3:4:3 standards and operating temperatures remain within -10°C to +60°C limits. Preventive maintenance includes semi-annual lubrication of moving parts with ISO VG 32 pneumatic oil and torque verification of threaded connections to manufacturer specifications. Pressure testing should occur annually at 1.1 times working pressure to verify seal integrity, while coupling replacement becomes necessary when leakage exceeds 1% of flow rate or connection force increases beyond normal operation parameters.