PM12-25-45s Single-acting manual pump with relief valve

PM12-25-45s is multi-displacement single-acting plunger manual hydraulic pump equipped with built-in adjustable relief valve, covering three optional displacements: PM12 / PM25 / PM45. Reciprocate the handle to drive internal plunger for linear reciprocating motion, changing pump cavity volume to complete hydraulic oil suction and high-pressure output; the integrated relief valve realizes automatic overpressure unloading for whole hydraulic system. The flange base design enables stable fixed installation on customized hydraulic power packs.Core Advantages✅ 3-in-1 Variable Displacement Design

Same pump housing compatible with 3 flow specifications: large displacement (PM45/25) for fast oil feeding & rapid lifting at low pressure; small displacement (PM12) saves hand force for high-pressure holding, balances working speed and operating effort flexibly.

✅ Built-in Overload Pressure Protection

Side-mounted adjustable relief valve automatically releases excess pressure when system overload occurs, effectively avoiding pump and matched cylinder damage from overpressure, improving equipment operation safety.

✅ Spec-based Ergonomic Force Matching

Three independent pressure-handle curves for 0~600BAR working range; refer to orange maximum force benchmark to configure matched handle length for each model, keep hand load within labor-saving scope and reduce long-operation fatigue.

✅ Flange Mount Base

Integrated bottom flange with preset fixing holes, directly bolted onto equipment base without auxiliary brackets, stable installation and neat pipeline arrangement.Application ScenariosPerfectly matched with single-acting hydraulic cylinders, widely used for auto repair lifting tools, small industrial lifting equipment, engineering maintenance hydraulic tools and customized hydraulic units requiring both variable flow and overpressure safeguard.