Bosch Rexroth Z2FS6-2-4X/2QV Hydraulic Flow Control Valve

 

 

Product Overview

The Bosch Rexroth Z2FS6-2-4X/2QV is a sandwich plate throttle check valve (flow control valve) used in hydraulic systems to regulate actuator speed.

It is installed between a directional valve and a subplate to control flow rate in one direction while allowing free return flow in the opposite direction.

Key Specifications

• Brand: Bosch Rexroth
• Model: Z2FS6-2-4X/2QV
• Material No.: R900481624
• Type: Twin throttle check valve (flow control + check valve)
• Design: Sandwich plate (NG6 / CETOP 3 / ISO 4401-03)
• Max Operating Pressure: up to 315–350 bar
• Max Flow: up to 80 L/min
• Adjustment: setscrew / rotary knob (flow regulation)
• Fluid Compatibility: mineral oil, fire-resistant fluids (HLP, HFC, etc.)
• Seals: FKM (high temperature & oil resistant)
• Weight: approx. 1.0–1.04 kg

Function Principle

This valve contains two throttle + check valve elements:

• One direction → flow is restricted (speed control)
• Reverse direction → free flow through check valve

It can be used in two ways:

• Supply throttling: control cylinder extension speed
• Return throttling: control cylinder retraction speed
• Pilot flow control: adjust switching speed of directional valves

Advantages & Features

• Precise hydraulic actuator speed control
• Compact sandwich plate installation (no piping needed)
• Stable flow regulation under high pressure
• Adjustable flow setting via screw or knob
• Works in both supply and return flow modes
• High durability for industrial hydraulic systems

Applications

• Injection molding machines
• Press machines
• Hydraulic cylinders & actuators
• Machine tools
• Industrial automation hydraulic systems
• Construction machinery
• Steel & heavy industry equipment

Precautions

• Must match NG6 / CETOP 3 / ISO 4401-03 mounting standard
• Incorrect adjustment may cause unstable cylinder speed or shock movement
• Ensure clean hydraulic oil (ISO 4406 cleanliness class required)
• Do not use in systems exceeding pressure/flow limits
• Installation must be between correct valve stack layers
• Regular inspection recommended for contamination or wear