PMDVB12-25-45byB-s Two-Way Manual Pump

PMDVB12-25-45byB-s is double-acting multi-displacement manual hydraulic pump with 3 optional specifications (PM12/PM25/PM45), built-in 3-position 4-way directional valve (O-type default, optional Y-type median), hydraulic lock and overflow relief valve. Double-acting plunger realizes continuous oil suction & discharge during both pushing and pulling handle stroke; integrated directional valve controls bi-directional movement of double-acting cylinder, hydraulic lock holds cylinder position reliably, overflow valve offers overpressure protection for whole hydraulic loop.Core Advantages✅ 3-in-1 Variable Displacement Selection

One pump housing fits three flow sizes: PM25/45 large displacement for fast oil feeding & rapid lifting at low pressure; PM12 small displacement saves hand force for high-pressure holding, balances lifting speed and operating effort flexibly.

✅ Double-Acting Continuous Oil Output

Push & pull handle both generate hydraulic oil delivery, uninterrupted fluid supply to greatly improve lifting efficiency vs single-acting pump.

✅ Triple Integrated Valves for Full Protection

3/4 directional valve(O/Y optional): directly control cylinder extend & retract without external reversing valve;

Built-in hydraulic lock: lock cylinder position tightly to prevent slipping under load after pump stops pressurization;

Overflow relief valve: auto unloading for overload pressure to protect pump and cylinder from damage.

✅ Ergonomic Optimal Force Matching

Three independent pressure-handle curves cover full 0~600BAR working range; refer to orange optimal intensity baseline to configure matched handle length for each model to reduce operating fatigue.

✅ Flange Fixed Base Design

Integrated bottom flange with pre-set mounting holes for direct bolt fixing on equipment base without extra brackets, convenient for customized hydraulic unit assembly.

Application FieldsMatched with double-acting hydraulic cylinders, widely used for automobile repair lifting equipment, heavy-duty mechanical maintenance, industrial portable hydraulic tools and precision customized hydraulic systems requiring position locking + overload safeguard + bi-directional control.