SY000022100 Pilot Throttle Check Valve | Sany Original Part
Valve Body Model: DXJLF-210-1.1 (Engraved on Physical Unit) | Part Number SY000022100
Sany Material Code: A220401000609
Compatible Valve Body: Hengli HVME400 Distributor Valve (150601080024A), Dedicated for SY365H/375H/395H/485H Euro IV Models' Pilot Oil Circuit
I. Basic Parameters
1. Structure: Tubular integrated throttle check valve with external threaded inlet featuring a filter and internal threaded outlet; incorporates built-in throttle damping and check valve core.
2. Rated Throttle Orifice Diameter: 1.1mm (suffix -1.1 in model number); check valve opening pressure: 0.12MPa.
3. Thread Specifications: External metric G1/4 thread, internal G1/4 thread; installed in series in the pilot circuit.
II. Installation Location
Installed in the steering priority pilot control oil circuit, connected in series between the HVME400-013000 pilot valve assembly and the foot-operated pilot valve. It serves as a limiting and stabilizing component in the steering priority system.
III. Core Functions
1. Forward Throttle Limiting: When steering, pilot oil passes through a fixed 1.1mm throttle orifice, controlling pilot flow to ensure smooth opening of the priority valve, maintaining stable steering priority logic and providing uniform, non-jerky steering feel.
2. Reverse Straight-through Check: When releasing the steering handle, oil flows back without throttling, allowing rapid return. The valve core fully opens to relieve pressure, immediately resetting the priority valve so that all main pump oil converges into the working system.
3. Front-end Filter Protection: An internal stainless steel filter at the inlet intercepts impurities, preventing clogging of small damping holes and jamming/failure of the priority valve.
IV. Common Faults
1. Clogged Filter/Throttle Orifice: Insufficient pilot oil supply causes delayed opening of the priority valve, resulting in heavy steering during compound operations and actions pulling off course.
2. Stuck Check Valve with Inadequate Closure: Backflow throttling occurs; after returning the handle to neutral, the priority valve fails to reset, leading to continuous priority oil supply and weak lifting/dumping actions throughout the vehicle.
3. O-ring Aging and Leakage: Loss of pilot pressure causes inconsistent steering effort (light/heavy).
V. Part Differentiation
- Sany Original: Features steel stamp SY part number + DXJLF-210-1.1 model; damping holes are precision-calibrated at factory, with uniform filter mesh size.
- Aftermarket: May have variations in throttle orifice diameter and easily detachable filters, leading to abnormal steering speed after installation.