PMD12-25-45byB-s Two-Way Manual Pump

PMD12-25-45byB-s is two-way multi-displacement plunger manual hydraulic pump integrated with 3-position 4-way directional valve and built-in overflow relief valve, supporting PM12/PM25/PM45 three optional displacements; the directional valve can be configured with O-type or Y-type middle position as required. Reciprocate the operating handle to drive inner plunger reciprocating movement, changing pump cavity volume to finish hydraulic oil suction and high-pressure output; the integrated directional valve controls cylinder extension & retraction, while relief valve realizes automatic overpressure unloading protection for the whole hydraulic circuit.Core Advantages✅ 3-in-1 Variable Displacement Design

Single pump body compatible with three flow sizes: large displacement (PM25/PM45) for rapid oil supply and fast lifting under low working pressure; small displacement (PM12) for labor-saving high-pressure holding, balancing lifting efficiency and hand operation force flexibly.

✅ Integrated Directional + Overflow Dual Valve Structure

Built-in 3/4 directional valve (O/Y median optional) eliminates extra external reversing valve for direct cylinder bidirectional control; matched adjustable overflow relief valve automatically releases excess pressure when system overload occurs, preventing pump and hydraulic cylinder from overpressure damage for double safety guarantee.

✅ Ergonomic Optimal Force Matching

Three independent pressure-handle characteristic curves cover full range of 0~600BAR working pressure; refer to orange optimal intensity benchmark line to select matched handle length for each specification to minimize hand fatigue during continuous operation.

✅ Integrated Flange Base Mounting

Bottom integral flange with prefabricated fixing holes for direct bolt-on installation on equipment base without auxiliary brackets, compact layout to simplify customized hydraulic station assembly and pipeline arrangement.Application ScenariosPerfectly matched with single-acting hydraulic cylinders, widely applied in auto repair lifting equipment, industrial maintenance hydraulic tools, portable engineering hydraulic devices and customized hydraulic systems requiring both bidirectional flow control and overpressure safeguard.