ISO 16028 Connect Under Pressure Flat Face Hydraulic Quick Couplings

Product Specification

Feature

JINGYE Fittings supplies ISO 16028 Connect Under Pressure Flat Face Hydraulic Quick Couplings for hydraulic attachments with trapped pressure. JY-FF-CUP pairs a specialized residual-pressure male plug with a compatible female socket. Key Product Advantages: 1. Four CUP Male Plug Models JY-FF-CUP-10-P, JY-FF-CUP-12-P, JY-FF-CUP-16-P and JY-FF-CUP-19-P cover the planned 10, 12.5, 16 and 19 mm interface groups. P identifies the male plug/nipple. Female sockets are selected separately for mating geometry, sealing compatibility and service requirements. Interface and port sizes are specified separately. 2. ISO 16028 Flat Face Interface The series follows ISO 16028 flush-face hydraulic coupling mating geometry. Male nose diameter, locking groove, sealing face and socket engagement features support dimensional interchangeability with compatible mating halves. ISO mating compatibility does not imply equal CUP ratings. 3. Connect Under Pressure Valve Mechanism The specialized CUP male plug incorporates a pressure-relief or pressure-balancing valve arrangement. During initial engagement, an auxiliary valve can help manage trapped fluid pressure before the main shutoff opens. This reduces engagement resistance within specified limits. 4. Male-Side Residual Pressure Connection The intended configuration permits residual pressure in the CUP male plug while the mating female socket is depressurized. It assists hoses with thermally induced trapped pressure. Connection limits depend on design and size; CUP does not imply pressure disconnection. 5. Low Spillage and Contamination Control Flat, self-sealing valve faces can be wiped clean before mating. Both halves close on disconnection, limiting hydraulic oil loss and air inclusion. Flush faces support cleaner attachment changes. Dust caps and plugs provide additional storage protection. 6. Push-to-Connect Locking and Engagement A compatible female socket secures the plug through locking balls, a spring-loaded sleeve and the male engagement groove. Controlled groove geometry, sleeve movement and locking retention support repeatable operation. Optional safety sleeves reduce unintended release. Residual-pressure connection force is evaluated separately from normal coupling force. 7. Pressure, Flow and Hydraulic Performance Working pressure, permitted residual connection pressure, proof pressure, burst pressure and impulse endurance are separate specifications. Commercial CUP benchmarks reach 350–420 bar working pressure and up to 300 bar male-side residual connection pressure in selected designs; these are not universal JY-FF-CUP ratings. Flow and pressure drop vary with valve design, body size and oil viscosity. 8. Engineered Materials and Corrosion Protection Precision CNC-machined carbon steel bodies combine with hardened valve components, springs and retaining hardware. NBR seals suit compatible mineral hydraulic oils; selected designs may use FKM or PTFE anti-extrusion elements. Trivalent chromium zinc plating at 8–12 μm protects carbon steel surfaces, with enhanced coating options. 9. Quality Inspection and CUP Function Testing Under ISO 9001:2015 quality management, inspections address interface dimensions, locking groove, valve movement, relief elements, threads, sealing faces, coating thickness and assembly cleanliness. Agreed verification can cover residual-pressure engagement force, internal and external leakage, oil spillage, proof/burst pressure, pressure drop, impulse endurance and repeated coupling cycles. 10. OEM Configuration and Second-Source Supply Options include CUP male plugs, matched female sockets, BSPP/NPT/SAE ports, seal compounds, valve details, coatings, dust protection and private-label identification. JINGYE Fittings supports samples, drawings, dimensional matching, second-source projects and mixed-SKU OEM orders. Buyers can specify pressure on each side, flow, fluid, temperature and annual volume. 11. Hydraulic Attachments and Mobile Equipment Applications include excavators, skid-steer loaders, breakers, augers, grapples, agricultural implements, forestry attachments, mining machinery and mobile hydraulic service lines. The CUP design is particularly valuable for interchangeable attachments whose disconnected hoses retain pressure, while its flat-face interface supports cleaner, faster field connections.