LRHC-XHN SUN Cartridge Valves
Full Name: Normally Closed, Modulating Logic Element
1. Functional Principle
- Type: 2-way normally closed modulating pressure compensation logic element without internal orifice
- Flow direction: Normally closed from inlet to secondary port. The valve opens gradually when pressure is applied to the pilot port, achieving proportional throttling and pressure compensation.
- Control mode: Opening degree is regulated by pilot pressure. Higher pilot pressure brings larger opening until fully open. It maintains constant pressure differential across the orifice.
- Features: Pure pressure compensation structure with no inner orifice. It delivers fast response, low hysteresis, and stable flow independent of load pressure fluctuation.
2. Core Technical Specifications
- Cavity style: T-17A (3 series)
- Rated flow: 60 gpm (240 L/min)
- Maximum working pressure: 5000 psi (350 bar)
- Pilot pressure range: 0–350 bar (corresponding to fully closed to fully open)
- Hysteresis: Less than 5%
- Repeatability: Less than 1%
- Weight: 0.40 lb (0.20 kg)
- Hex size: 1 1/4 in (31.8 mm)
- Installation torque: 150–160 lbf·ft (203–217 N·m)
- Seal material: X represents Buna-N nitrile rubber, applicable to mineral oil within temperature range of -40℃ ~ 120℃
3. Port Definition
- Inlet: Main oil inlet port
- Secondary: Working and return oil port
- Pilot: Pressure control port, valve opens with increased applied pressure
4. Typical Applications
- Pressure compensation circuit: Stabilize actuator speed by maintaining constant pressure difference across orifices against varying loads
- Load sensing system: Realize on-demand flow distribution and energy saving matched with pump control
- High-precision high-flow control for construction machinery and injection molding machines
- Flow dividing and synchronization control of multiple actuators
5. Model Code Explanation
- LRHC: Series code, Remote pilot operated, Normally closed, Modulating logic element
- X: Seal material, Buna-N nitrile rubber
- HN: Standard specification, 60 gpm flow rate, T-17A cavity, normally closed type
6. Features & Notes
- Normally closed structure keeps valve fully closed under pressure loss for safe locking and load anti-drifting protection
- Orifice-free design offers large flow capacity, low pressure drop and low heat generation
- Excellent pressure compensation performance ensures stable flow and strong anti-interference capability for precise control
- External pilot control is required, manual adjustment is not available
- Internal leakage: Less than 0.5% of rated flow when fully closed
7. Key Difference from LPHC-XHN
- LRHC-XHN: Normally closed type; fully closed without pressure; applied for pressure compensation and flow stabilization
- LPHC-XHN: Normally open type; fully open without pressure; applied for proportional throttling and speed regulation
