YXL - Pump with Priority Valve

I. Core Definition and Structure

Type: Differential pressure reduction type, Load Sensing (LS), Pump Port Direct Connection Priority Valve.

Structural Characteristics:

The valve body is directly connected to the flange / thread of the steering pump, and the P port is directly connected to the pump outlet without a pipe.

Integrated priority valve core + control spring + steering safety valve + LS signal chamber, cast as one piece.

Oil ports: P (pump port), CF (steering gear), EF (working system), LS (load sensing), T (return oil).

Core principle: The LS signal controls the valve core, prioritizing the CF flow; when not steering, P → EF is directly connected to achieve dual pump confluence / energy saving.

II. Main Models and Key Parameters (Pump Series)

1. Model Description (Example: YXL-F160L-N7)

YXL: Series Code

F: Load-sensing type

160: Maximum inlet flow rate (L/min)

L: Threaded connection (F = Flange)

N7: The LS controls the pressure at 0.7 MPa (N4.5 = 0.45 MPa, N10.5 = 1.05 MPa)

2. Technical Specifications (Industry Standard)

ModelMaximum Flow Rate (L/min)Rated Pressure (MPa)Peak Pressure (MPa)Control Pressure (MPa)Safety Valve Pressure (MPa)Oil Port SpecificationCompatible Pump

YXL-F80L8016200.45/0.7/1.056.3–16P/EF:G3/4; CF:G1/280L/min Directional Pump

YXL-F100L10016200.45/0.7/1.056.3–16P/EF:G3/4; CF:G1/2100L/min Directional Pump

YXL-F150L15016200.712–16P/EF:G1; CF:G3/4150L/min Directional Pump

YXL-F160L16016200.45/0.7/1.0512–16P/EF:G3/4; CF:G1/2160L/min Directional Pump

YXL-F200L20016200.712–16P/EF:G1; CF:G3/4200L/min Directional Pump

YXL-F250F25016200.714P/EF: Flange; CF:G1250L/min Directional Pump

III. Pump Series vs. Ordinary YXL Priority Valve (Core Difference)

Comparison item: YXL pump with priority valve / Ordinary YXL priority valve

Installation method: Integrated with the steering pump directly / Installed separately, requiring pipe connection to the pump

Piping: No P port piping, reducing leakage points / Requires P port oil inlet pipe, more connections

Response speed: Faster (no pipeline pressure loss) / Slightly slower (pipeline damping)

Space: More compact, saving installation space / Requires independent valve block / bracket

Maintenance: Pump valve integrated, requires simultaneous disassembly for inspection / Valve pump separated, can be inspected separately

Applicability: Compact models such as loaders, forklifts, agricultural machinery, etc. / General models with sufficient space

IV. Core advantages

Integration: Valve and pump integrated, reducing pipelines, connections, and leaks, higher reliability.

Energy-saving and efficient: When not in operation, P→EF is direct connection, with almost no loss of flow, and the working system has sufficient flow.

Steering stability: Precise control of the LS signal, constant CF flow, no steering deviation or stalling.

Protection is comprehensive: A built-in steering safety valve is included, which automatically releases pressure in case of overload, protecting the steering gear and the oil cylinder.

Compatible range: Compatible with BZZ5, BHR5, BPB5, TLF1, etc. load-sensing steering gears.

V. Typical Applications

Construction machinery: 3-5T loaders (ZL30/50, LG936/956, Linke 953), graders, rollers, heavy forklifts.

Agricultural machinery: High-power tractors, combine harvesters, silage machines (steering + working device integration).

Industrial vehicles: Heavy lift trucks, tractors, cleaning vehicles.

VI. Selection and Replacement Guidelines

Flow Matching: The maximum flow of the priority valve should be ≥ the rated flow of the steering pump (for example, if a 160L/min pump is selected, then YXL-F160L should be chosen).

Control the pressure: Match with the LS signal of the steering gear (commonly 0.7 MPa, N7).

Connection method: Select the thread (L) or flange (F) according to the pump interface.

Rated models: DYXL-F160L, VLE-160S, BZZ-160 Priority Valve for Pumps.