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Quick Release Coupling

Quick Release Coupling

1. Overview

Quick Release Couplings (QRCs) are specialized fittings designed to rapidly connect and disconnect fluid lines without the need for tools. They enable efficient and leak-minimized connections in systems where frequent coupling and uncoupling is required.

These are widely known as:

  • Quick Couplers
  • Quick Connect Couplings
  • Quick Disconnect Fittings

2. Function & Working Principle

Quick couplings consist of two main parts:

  • Male Plug (Nipple)
  • Female Socket (Coupler Body)

Operation

  • The male plug is inserted into the female socket
  • An internal locking mechanism (balls/sleeves) secures the connection
  • Internal valves automatically open to allow fluid flow
  • Upon disconnection, valves close instantly → preventing leakage or fluid loss

3. Applications

Used in both hydraulic and pneumatic systems, including:

  • Hydraulic machinery and equipment
  • Air compressor lines
  • Construction and mining equipment
  • Automotive service systems
  • Industrial fluid transfer systems

4. Materials of Construction

Quick couplings are manufactured in different materials depending on application requirements:

  • Stainless Steel (SS316)
    • Corrosion-resistant
    • Suitable for chemical and marine environments
  • Carbon Steel
    • High strength
    • Ideal for heavy-duty hydraulic applications
  • Brass
    • Good corrosion resistance
    • Common in pneumatic and low-pressure systems

5. Size Range

  • Available from 1/4” to 2” (standard sizes)
  • Custom sizes may be available depending on application

Table 1: Working Pressure According to Different Size and Standard

Size ISO 7241-A Norm (Bars) ISO 7241-B Norm (Bars) 203 Series TGW (Bars)
1/4" 350 400 950
3/8" 300 380 750
1/2" 300 350 750
3/4" 250 320 650
1" 230 300 450
1 1/4" 230 280 450
1 1/2" 200 140 300
2" 130 100 300

There are a wide variety of body and seal materials available to maximize the compatibility in various of application.

Table 2: Different Quick Release Coupling Standard with its Main Features

Quick Coupling Standard ISO 7241-A Norm ISO 7241-B Norm 203 Series TGW
Working Pressure Up to 350 Bars Up to 400 Bars Up to 950 Bars
Connection Type Push-in type Push-in type Threaded type
Material Type Stainless steel, AISI 316
Carbon steel, EN-10277-3
Brass, DIN-EN 12164		 Stainless steel, AISI 316
Carbon steel, EN-10277-3
Brass, DIN-EN 12164		 Stainless steel, AISI 316
Carbon steel, EN-10277-3
Brass, DIN-EN 12164
Working Temperature NBR (-30°C to 100°C)
Viton (-10°C to 200°C)
EPDM (-40°C to 150°C)		 NBR (-30°C to 100°C)
Viton (-10°C to 200°C)
EPDM (-40°C to 150°C)		 NBR (-30°C to 100°C)
Viton (-10°C to 200°C)
EPDM (-40°C to 150°C)
Equivalent Design Faster ANV
Aeroquip FD56
Parker 6600
Snap-Tite 61		 Faster H
Aeroquip FD45
Parker 60
Snap-Tite 72		 Gromelle 6000
Tuthill 6000
Hansen W6000

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