Connect Under Pressure Flat Face Screw-to-Connect Hydraulic Quick Couplings

Product Specification

Feature

JINGYE Fittings supplies JY-STC-CUP Connect Under Pressure Flat Face Screw-to-Connect Hydraulic Quick Couplings for heavy-duty hydraulic circuits with trapped residual pressure. Flat-face double shutoff, threaded retention and pressure-management elements support clean, controlled connection. Key Product Advantages: 1. JY-STC-CUP Series and Connection Configurations JY-STC-CUP identifies the flat-face screw-to-connect CUP family. Published coupling-set listings cover 3/8"–1-1/2" BSP/NPT end ports and selected configurations rated up to 550 bar. Specify body size, port size, male plug, female socket and pressure-management arrangement independently. 2. Flat-Face Valves and Low-Spillage Connection Flush mating faces can be wiped before engagement to reduce dirt entry. Spring-loaded flat-face valves close both separated halves and limit oil loss and air inclusion during coupling changes. Valve-seat finish, spring action, face alignment and seal geometry influence leakage. Low spillage does not imply zero leakage or unrestricted pressure disconnection. 3. Screw-to-Connect Mechanical Locking A rotating threaded sleeve or coupling nut draws the mating halves together and retains the assembly through threaded engagement. Controlled thread profile, axial travel, sleeve rotation support secure connections in vibration- and pressure-impulse-exposed equipment. Mating locking threads differ from BSPP, NPT and other hydraulic end ports. 4. Specialized Residual-Pressure Connection Mechanism An engineered decompression, staged-valve or pressure-balancing arrangement helps engage hydraulic lines containing trapped static pressure. The pressure-management feature may be located in the plug, socket or matched set. Permitted pressurized half, residual-pressure limit and connection procedure depend on the selected layout. 5. Working Pressure Versus CUP Connection Pressure Selected JINGYE coupling-set descriptions indicate working pressure up to 550 bar, depending on configuration. Comparable Stucchi VEP-HD designs publish 400–550 bar coupled working pressure and up to 250 bar one-sided residual connection pressure. These are reference figures, not JY-STC-CUP ratings. Working, residual connection, proof, burst and disconnection pressures are separate engineering limits. 6. Hydraulic Flow and Pressure-Drop Performance Comparable Kuaishi FT flat-face screw couplers list DN10/12.5/16/19/25/40/50 rated flows of 23/45/74/100/189/288/379 L/min. These are FT reference values, not confirmed JY-STC-CUP results. Pressure drop depends on valve passages, body size, oil viscosity and flow. 7. Low-Spillage Engineering and Fluid Cleanliness Comparable FT-series disconnect spillage figures across DN10–DN50 range from 0.010 to 0.350 mL under its test conditions. Flat faces reduce exposed fluid pockets and permit cleaning before reconnection. Actual oil loss, air inclusion and cleanliness performance depend on the selected JY-STC-CUP construction, seal condition. 8. Carbon Steel Construction, Seals and Coatings Precision CNC-machined carbon steel bodies and threaded sleeves combine with steel flat-face valves, decompression parts, wear-resistant components and return springs. NBR and PU seals suit compatible mineral hydraulic oils; selected FKM and PTFE backup components address other service requirements. Trivalent chromium zinc plating (typically 8–12 μm), Zn-Fe, Zn-Ni or QPQ finishes may be specified by design. 9. Precision Inspection and CUP Function Testing JINGYE Fittings operates under ISO 9001:2015 quality management. Inspection includes mating faces, locking threads, valve seats, seal grooves, decompression passages, port gauges and surface finish. Agreed verification may cover leakage, measured spillage, pressure drop, proof/burst, impulse cycles, threaded engagement and connection torque under defined residual pressure, with the pressurized half recorded. 10. OEM Customization and Second-Source Procurement Supply choices include male plugs, female sockets and matching sets; CUP valve layout; BSPP/NPT and selected SAE/ORB ports; seal compounds, coatings, protective caps, marking and private labels. Customer drawings and mating samples support dimensional comparison. JINGYE Fittings supports trial samples, mixed-SKU sourcing, customized machining, repeat orders and OEM second-source development. 11. Construction, Mining and Mobile Hydraulics Applications include excavator attachments, hydraulic breakers, drilling rigs, cranes, loaders, forestry and mining machinery, industrial hydraulic power units, hose assembly manufacturing and plant maintenance. The combination of threaded locking, flat-face shutoff and specified CUP capability suits detachable hydraulic circuits where clean handling and trapped-pressure reconnection are important.