HD9 Pump Head Valve A4VG90/125/180/250
2 month ago
Product details
HD9 Pump Head Valve A4VG90/125/180/250
Product Overview
HD9 Pump Head Valve is a dedicated Hydraulic valve assembled directly on Rexroth A4VG series closed‑circuit hydraulic pump, compatible with A4VG90, A4VG125, A4VG180, A4VG250 models . As a core regulating component inside the complete hydraulic system, this Hydraulic valve realizes hydraulic‑displacement adjustment, pressure cutoff and overload protection for the main hydraulic pump. It governs swash‑plate swing angle, changes pump output flow and protects the whole hydraulic system from over‑pressure damage. Widely used for aftermarket replacement, field overhaul and repair of heavy‑duty construction Machine such as concrete mixer trucks and road rollers. The performance of this Hydraulic valve directly determines the working stability and response sensitivity of the matched hydraulic pump.
Technical Specifications
- Compatible pump models: A4VG90, A4VG125, A4VG180, A4VG250 with HD9 control mode
- Product category: Hydraulic valve, pump‑mounted control assembly for closed‑circuit hydraulic pump
- Control function: Hydraulic displacement adjustment, pressure cut‑off, high‑pressure overload protection
- Working pressure: Matches A4VG closed‑circuit hydraulic system, nominal pressure 400 bar, peak pressure 450 bar
- Installation: Direct flange mounting on housing of A4VG series hydraulic pump, no extra modification
- Main components: Valve body, control spool, pressure cutoff spring, servo piston, seal assembly
- Working medium: Anti‑wear hydraulic oil for mobile hydraulic system
- Operating temperature: ‑20℃ ~ +85℃
- Feature: Precision‑ground spool pair, stable pressure setting, excellent interchangeability, strong anti‑pollution capability, perfectly fits the main pump of heavy‑load engineering Machine.
Working Principle
Pilot control oil acts on this Hydraulic valve, pushing the internal spool to shift and output control pressure oil to the servo piston of hydraulic pump. It drives the swash plate to swing, adjusts displacement and output flow of the hydraulic pump. When system pressure exceeds preset value, built‑in pressure‑cutoff function will force the swash plate back toward zero displacement to limit maximum pressure and safeguard the whole hydraulic system against overload damage. If the Hydraulic valve gets stuck or worn, the Machine will suffer faults including failure of pump displacement adjustment, system over‑pressure, unstable speed and abnormal noise. Installing qualified HD9 pump head valve can restore normal operation of the hydraulic pump and keep the hydraulic system running reliably.
Core Advantages
1. Strictly follow original installation dimensions, high interchangeability, direct replacement for damaged parts without machining, convenient for on‑site maintenance of Machine.
2. Reliable pressure‑cutoff performance, effectively prevent over‑pressure impact, extend service life of the matched hydraulic pump and other components in hydraulic system.
3. High‑precision internal components, smooth response, strong resistance to oil contamination, adapt to harsh vibration working environment of mobile Machine.
4. Solve typical failures: pump cannot adjust displacement, system over‑pressure, unstable output flow, high internal leakage of hydraulic pump.
5. Every unit undergoes strict pressure test before delivery, stable performance for heavy‑duty closed‑circuit hydraulic system.
Application Range
HD9 pump‑head Hydraulic valve is an essential spare part for Rexroth A4VG series closed‑circuit hydraulic pump. It serves the hydraulic system of various mobile engineering Machine, mainly applied for concrete mixer trucks, road rollers, pavers and other hydrostatic‑transmission equipment. Supplied for machinery repair workshops, service stations and global aftermarket spare‑parts trading.
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