Hydraulic quick couplings first appeared during World War II in the 1940s.
At that time, the military needed to quickly replace and repair hydraulic lines in the field, such as on tanks, aircraft, and construction machinery.
Traditional threaded fittings were slow to remove and prone to oil leakage, so quick couplings were invented to allow tool-free, hand-operated connection and disconnection, automatically sealing the oil line to reduce spillage.
After the war, this technology was widely adopted in agricultural machinery, construction equipment, and industrial applications.
Applications
The main function of hydraulic quick couplings is to connect and disconnect hydraulic lines quickly without tools and with minimal oil loss.
Typical applications include:
• Construction machinery: quick attachment changes for excavators, loaders, etc.
• Agricultural equipment: connecting tractors to hydraulic implements
• Industrial systems: hydraulic test benches, pressure testing
• Marine and defense: rapid replacement of hydraulic components
• Environmental protection: flat-face couplings to prevent oil leakage
Standards
Hydraulic quick couplings are regulated by ISO (International Organization for Standardization) to ensure interchangeability and consistent performance across manufacturers.
Common standards include:
• ISO 7241-A: Type A hydraulic quick couplings (common in agriculture and general industry, popular in North America)
Features:
Meet ISO 7241-1 Part A Standard
Provide an additional O-ring ,PTFE support ring.against to the high pressure environment.
Both Sleeve and Nipple are hardened to make the couplings resistant to damage frow brinelling and mechanical shock.
The durable-ball-locking mechanism ensures a reliable connection every time.
Captive valve seal assures poppet sealing. The valve seal is positively captured by the metal poppet to minimize seal washout or damage frow high velocity fluid.
Dust Caps available,Female Pipe and BSPP OR NPT threads are available upon request
• ISO 7241-B: Type B hydraulic quick couplings (widely used globally with excellent interchangeability)
Features:
Meet ISO 7241-1 Part B Standard
Can beused for any type of industrial applications because of the broad range of materials seals and end configurations
Body seal steel and stainless steel versions feature PTFE back-up ring which prevents seal washout at high flow rates .Brass couplers have a double essure and vacuum applications.
The durable-ball-locking mechanism ensure a reliable connection every time .
Captive valve seal assures poppet sealing.The valve seal is positively captured by the metal poppet to minmize seal washout or damage frow high velocity fluid.
Dust Caps available,Female Pipe and BSPP OR NPT threads are available upon request
• ISO 5675: Agricultural hydraulic couplings (typical for tractors)
• ISO 16028: Flat-face hydraulic couplings (leak-free design for environmental protection)
Features:
Meet ISO 16028 Standard
FLush-Faced poppet for a minimal air inclusion when connecting. Minimal fluid loss during disconnection and for an easycleaning.
Both sleeve and nipple are hardened to make the couplings resistant to damage frow brinelling and mechanical shock minimal pressure drop.
A safety sleeve lock prevents accidental disconnection push-to-connect operation allows one hand operation when connecting to coupling.
Dust caps available,Female Pipe and BSPP or NPT thread are available upon request.
ISO standards specify:
• Dimensions and thread sizes
• Working pressure ratings
• Flow capacity
• Leakage performance requirements
• Material and surface treatment specifications
Post time: Aug-18-2025