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R900021845

SV20PB1-4X/V

Manufacturer: Bosch Rexroth

Material #: R900021845

Model : SV20PB1-4X/V


***Disclaimer: The following summary contains information gathered from various sources such as product descriptions, technical specifications and catalogs. While efforts have been made to provide accurate details, inaccuracies may occur. It is advised to verify all information by contacting Bosch Rexroth directly.***
The Bosch Rexroth SV20PB1-4X/V (R900021845) is an advanced isolator valve designed for subplate mounting or threaded connections, facilitating the leak-free blocking of one actuator port even during extended periods of inactivity. The valve is composed of a robust housing, a seat poppet, a compression spring, and a control spool, with an optional pre-opening feature as a ball seat valve. It allows for flow from A to B without external pilot pressure and achieves hydraulic tightness in the reverse direction under the condition that pA > pB, which refers to the cracking pressure of the compression spring. The innovative design ensures that when pilot pressure at port X is sufficiently high, it moves the control spool towards version A and disengages the seat poppet, allowing free flow in both directions while actively keeping the valve open. The valve's functionality is influenced by pressure ratios and area ratios at both the control spool and seat poppet. There are two versions available: Version A includes pre-opening which provides increased control open ratio for secure unloading even at low pilot pressures and helps avoid switching shocks by dampening decompression on the actuator side. Version B does not have pre-opening and may result in sudden unloading of pressure volume causing potential switching shocks. The SV20PB1-4X/V can be modified to type SL by exchanging plugs with designated NG sizes. It supports various porting patterns according to ISO standards for different NG sizes, ensuring compatibility with numerous systems. The unit is designed for maximum operating pressures up to certain bar levels and maximum flow rates measured in liters per minute (l/min), offering versatility across different hydraulic applications. Additional features include internal pilot oil return, optional dampened release with pre-opening, various optional cracking pressures, individually available check valve installation sets, and a corrosion-protected design for enhanced durability.

$1,249.00 USD

More are expected on February 24, 2025  
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Status: This product is temporarily out of stock. 


Qty: Delivered as early as February 24, 2025 when ordered in

This product is eligible for factory repair.

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