Hydraulic systems require precise flow control to ensure stable actuator speed, smooth motion, and reliable long-term performance. The Z2FS throttle check valve is widely used in hydraulic circuits to achieve accurate speed regulation by combining flow throttling and free return flow in a compact sandwich plate design.

BSTIND is a professional hydraulic valves manufacturer, producing high-performance hydraulic control components. We manufacture Z2FS throttle check valves with the same dimensional standards and functional performance as Bosch Rexroth Z2FS series, providing a reliable and cost-effective direct replacement solution for industrial applications.

What is Z2FS Throttle Check Valves?

BSTIND Z2FS throttle check valves are designed as direct replacement solutions for Bosch Rexroth Z2FS series hydraulic valves. They fully match the original installation dimensions, hydraulic performance, and functional structure, allowing seamless substitution without modifying the existing system.

This compatibility covers common Rexroth models such as rexroth z2fs6, rexroth z2fs10, and related configurations including part number rexroth r900481624.

For specific hydraulic circuit designs, BSTIND also supports equivalent structures such as Z2FS6 2 4X 2QV, ensuring full interchangeability with Rexroth sandwich plate valve assemblies.

Function of Z2FS Throttle Check Valve

The Z2FS valve combines two hydraulic functions in a single compact sandwich plate design: the throttle function, which controls flow rate in one direction, and the check valve function, which allows free reverse flow. This structure ensures:

  • stable actuator speed control
  • smooth return stroke without resistance
  • improved system efficiency

👉 In practical hydraulic systems, the z2fs valve is used to precisely control cylinder speed while maintaining fast return operation.

Z2FS Throttle Check Valve Working Principle

The internal structure of the Z2FS valve operates by separating flow paths in different directions: in the forward flow direction, hydraulic oil passes through an adjustable throttle section where the flow rate is restricted to control actuator speed, while in the reverse flow direction, oil bypasses through a check valve to allow unrestricted return flow. This dual-path design ensures accurate speed regulation, minimal energy loss, and stable system behavior under varying loads.

Z2FS Throttle Check Valve Working Principle

Z2FS model codes are used to identify the valve structure, size, and functional configuration. Each part of the code represents a specific technical parameter, helping to define the valve’s performance and application range. Example model: Z2FS 6 2 4X 2QV

Code Meaning
Z2FS Sandwich plate throttle check valve series
6 Size / flow class
2 Port configuration
4X Design / pressure series
2QV Adjustment / control type

Z2FS Throttle Check Valve Series Overview

The Z2FS series throttle check valves are designed to provide precise flow control across different hydraulic system sizes. Depending on the required flow capacity and application demand, different models are used to ensure stable actuator speed regulation and efficient system performance.

The Z2FS6 throttle check valve is used in medium-flow hydraulic systems requiring stable and accurate speed control. Typical applications:

  • machine tools
  • standard hydraulic cylinders
  • industrial automation systems

Common references:

  • z2fs 6 2 4x 2qv

The z2fs10 valve is designed for higher flow systems where larger actuator control is required. Typical applications:

  • heavy machinery
  • large hydraulic presses
  • construction equipment

Reference:

  • rexroth z2fs10

Z2FS Modular Throttle Check Valve Specification

Z2FS modular throttle check valve diameter
6=Size 6
10=Size 10
16=Size 16
22=Size 22

A.B cavity throttling =blank
À cavity throttle = A
B cavity throttle = B

Inlet throttle = S (6.10 diameter without it)
Inlet throttle= S2 (6.10 diameter without it)
Note: Size 6,Size 10 throttle valve can change inlet and outlet throttle, as long as turned the valve 180 degrees.
Max pressure is 35MPa, one direction throttling,another direction through the check valve re-flux.

Z2FS Check Valve Technical Documentation

The technical documentation of the Z2FS valve provides a complete engineering reference for selection, installation, and system integration. It combines key structural information, performance parameters, and standardized reference data to ensure accurate application in hydraulic systems. It typically includes the ordering code structure, hydraulic symbol diagram, technical data sheet, characteristic curves, and unit dimensions drawing, allowing engineers to understand both the functional behavior and physical installation requirements of the valve in a unified format.

Ordering Code Structure

Hydraulic Symbol Diagram

Technical Data Sheet

Characteristic Curves

Unit Dimensions Drawing

Z2FS Throttle Check Valve Applications

Hydraulic Press Systems

Injection Molding Machines

Industrial Automation Systems

BSTIND vs Rexroth – Engineering Equivalent Strategy

BSTIND and Rexroth serve different positioning strategies in hydraulic systems, but both deliver reliable engineering performance. Rexroth represents OEM-standard original design with strong system integration, while BSTIND focuses on functional equivalence, offering fully interchangeable solutions with more competitive sourcing and faster delivery. This allows users to choose between original equipment preference and cost-efficient replacement flexibility depending on project requirements.

Feature BSTIND Rexroth
Compatibility 100% interchangeable OEM standard
Hydraulic Function Equivalent performance behavior Original design
Installation Direct replacement OEM system integration
Cost Efficiency More competitive sourcing Higher brand premium
Supply Speed Faster delivery cycles Longer lead times

Hydraulic Valve FAQs

Yes, BSTIND valves are fully compatible with Bosch Rexroth Z2FS series.

Z2FS6 is designed for medium flow systems, while Z2FS10 is used in high flow hydraulic applications.

This is usually caused by incorrect adjustment, contamination in hydraulic oil, or mismatched system pressure rather than valve design.

No. Z2FS valves control flow speed only; direction is controlled by separate directional control valves.

You should confirm mounting dimensions, flow direction, pressure range, and exact model code.

Incorrect selection may lead to unstable flow control, improper actuator speed, or reduced system efficiency.

Hydraulic Valve FAQs