Rexroth Double Throttle Check Valve NG22 Z 2 FS 22-31/S2

Description

The Rexroth Z 2 FS 22-31/S2 is a double throttle check valve in a sandwich plate design. It is used to limit the main or pilot flow of one or two actuator ports. This is achieved by throttling the flow in one direction and allowing free flow in the opposite direction. It provides precise control for applications requiring meter-in or meter-out functionality.

Specifications

• Manufacturer: Rexroth (Bosch Rexroth)
• Type: Double Throttle Check Valve
• Model: Z 2 FS 22-31/S2
• Part Number: R900443176
• Size: NG22 / CETOP 10
• Maximum Operating Pressure: 315 bar
• Adjustment: Screw with lock nut
• Hydraulic Fluid: Mineral oil (HL, HLP) according to DIN 51524

Label Info

• Model: Z 2 FS 22-31/S2
• Material Number Code: *443 176*
• Serial Number: 00003844

Application

This valve is typically used in industrial hydraulic systems such as machine tools, presses, plastic injection molding machines, and general manufacturing equipment where precise speed control of hydraulic actuators is required.

Country of Origin

Germany

CO2 Impact

By purchasing this pre-owned valve, you are contributing to a circular economy. Re-using this 20 kg steel component avoids the emission of approximately 40 kg of CO2, which is equivalent to the emissions from driving a car for 200 kilometers.

Availability

This item is in stock and ready for immediate dispatch. Order now from PLC2Day for expert support and fast delivery.

FAQ

Question? What is the primary function of a Z2FS valve in a hydraulic circuit?

A Z2FS valve provides flow control for either meter-in (controlling flow into an actuator) or meter-out (controlling flow out of an actuator) applications. It allows fine adjustment of actuator speed.

The maximum operating pressure for the Z2FS 22 series is 315 bar (approximately 4568 PSI), making it suitable for high-pressure industrial systems.

While the existing O-rings may be in usable condition, for critical applications or to ensure a leak-free installation, it is always best practice to replace the seals with a new, standard NG22 seal kit.

Last Update: Friday, March 13, 2026

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