| Params | Product Name: Flat Face Screw-to-Connect Hydraulic Quick Couplings
Manufacturer: JINGYE Fittings (Ningbo Jingye Fluid Fittings Co., Ltd.)
Series: JY-STC-FF; threaded flat-face hydraulic quick coupling family.
Construction: Carbon steel male plugs and female sockets with flat-face double shutoff and mechanical screw locking.
1. Series Identification and Size Range
JINGYE Series: JY-STC-FF. Published coupling-set offering: 3/8"–1-1/2" NPT/BSP ports, with a stated maximum pressure of up to 550 bar for selected configurations. Comparable Kuaishi FT flat-face screw couplers cover DN10, DN12.5, DN16, DN19, DN25, DN40 and DN50. Specify actual coupling body size, plug/socket half and hydraulic end-port size separately.
2. Flat-Face Interface and Mating Geometry
Flush valve faces, plug nose, socket bore, engagement threads and axial valve travel determine the mating interface. A rotating threaded sleeve draws the halves together. Flat-face valve construction does not automatically mean ISO 16028 mating compatibility or ISO 14541 screw-coupling conformity. Match counterpart geometry, thread lead, seal location and full connected length to the selected profile.
3. Screw-to-Connect Locking Mechanism
A threaded nut or rotating sleeve engages the matching male/female locking thread and maintains axial connection. Thread design, engagement length, concentricity and assembly torque influence operation under vibration, shock and pressure impulses. This mechanical screw lock differs from conventional push-to-connect ball locking. Protective sleeves or secondary locks are design-specific options.
4. Flat-Face Valves and Double Shutoff
Flat mating faces allow exposed connection surfaces to be wiped clean before engagement. Spring-loaded shutoff valves open as the halves are screwed together and close on separation, limiting oil loss and air inclusion. Internal valve seats, springs, O-rings and anti-extrusion components provide sealing. Low spillage is not an absolute zero-leak guarantee.
5. Working Pressure and Pressure Strength
The published JINGYE coupling-set listing cites up to 550 bar for selected 3/8"–1-1/2" configurations. Comparable Kuaishi FT detailed performance data list 350 bar working pressure across its DN10–DN50 sizes. Stucchi VEP-P references reach up to 600 bar in particular designs. Do not combine different series ratings; working, proof, burst and impulse limits must be assigned by exact size and assembly.
6. Rated Flow, Maximum Flow and Spillage
Comparable Kuaishi FT DN10/12.5/16/19/25/40/50 rated flows: 23/45/74/100/189/288/379 L/min; published maximum flows: 46/90/150/200/280/750/1000 L/min. Corresponding reported disconnection spillage: 0.010/0.012/0.015/0.020/0.030/0.200/0.350 mL. These values are FT-series references, not uniform JY-STC-FF ratings. Pressure drop depends on flow, oil viscosity and internal passages.
7. Materials, Seals and Surface Protection
Precision CNC-machined carbon steel bodies, threaded sleeves and valve components; hardened or stainless wear parts according to design. NBR and polyurethane (PU) are common sealing elements, with FKM or PTFE backup options for selected fluids, temperatures and pressures. Trivalent chromium zinc, Zn-Fe, Zn-Ni and engineered wear-resistant finishes may be specified. Surface protection and seal chemistry follow the operating environment.
8. Ports, Temperature and Residual Pressure
BSPP (G), NPT and selected SAE/ORB ports are used in comparable screw-flat-face designs; port threads are distinct from the coupling's locking thread. Kuaishi FT reference temperature: -25°C to +100°C; Stucchi VEP-P NBR reference: -20°C to +100°C. Some engineered flat-face screw series permit defined residual-pressure connection, but ordinary JY-STC-FF must not be treated as a dedicated CUP model without that configuration and pressure rating.
9. Dimensions, Inspection and Testing
Quality Management: ISO 9001:2015. Inspect mating faces, threaded engagement, sleeve rotation, valve stroke, seal grooves, end-port gauges, coating thickness and internal cleanliness. Agreed testing includes hydraulic leakage, flow/pressure drop, proof/burst pressure, impulse cycles, connection force, mechanical engagement cycles and disconnection spillage. Confirm exact mating interchange before OEM substitution.
10. Industries and OEM Procurement
Applications: excavator attachments, hydraulic breakers, forestry and mining machinery, cranes, drilling rigs, mobile hydraulics, hose assemblies and industrial power units. Options include matching sets, plug/socket supply, BSPP/NPT/SAE ports, seals, coatings, dust caps, marking and private-label packaging. JINGYE Fittings supports customer drawings, samples, dimensional matching, mixed-SKU sourcing, OEM production and second-source supply. | Material | Body Materials: Precision CNC-machined carbon steel for JY-STC-FF male plugs, female sockets and rotating screw-locking sleeves; C20/C45 material options by component.
Flat-Face Valves: Precision-machined steel shutoff valves and valve seats for low-spillage double shutoff; hardened wear surfaces where required.
Threaded Locking Parts: Carbon steel coupling nuts, mating locking threads, retaining rings and wear-resistant engagement components.
Springs: Spring steel or stainless steel valve-return and locking components.
Seals: NBR (Buna-N) and polyurethane (PU) for compatible hydraulic oils; optional FKM and PTFE backup rings for selected fluids, temperatures and pressures.
Surface Treatment: Trivalent chromium zinc plating, typically 8–12 μm; Zn-Fe, Zn-Ni or enhanced corrosion-resistant finishes for selected designs.
Manufacturing & Quality: Precision CNC turning, selective heat treatment, thread inspection, flat-face finish checks, leakage testing and material traceability. |
