Hydraulic Pilot Operated - Switching Isolator Valve - Check Valve (Bosch - Rexroth) , Without Drain Connection - Type SV. - Nominal Size NS20. - Qmax. = approx. 350 L/min. - Pmax. = 315 bar. - (P)(A)- With Pre-Opening.

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Hydraulic Pilot Operated - Switching Isolator Valve - Check Valve (Bosch - Rexroth) , Without Drain Connection - Type SV. - Nominal Size NS20. - Qmax. = approx. 350 L/min. - Pmax. = 315 bar. - (P)(A)- With Pre-Opening.
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SV_20_PA1-4X-
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Modified on: August 24,2026  
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Specifications
Supplier part number: SV_20_PA1-4X-
Name:Hydraulic Pilot Operated - Switching Isolator Valve - Check Valve (Bosch - Rexroth) , Without Drain Connection - Type SV. - Nominal Size NS20. - Qmax. = approx. 350 L/min. - Pmax. = 315 bar. - (P)(A)- With Pre-Opening.
Description:The Bosch Rexroth pilot-operated check valve matching your exact specifications—nominal size 20 (NS20), with subplate mounting (P), and the version with pre-opening (A)—is identified by the model number SV 20 P A 1-4X/ . The "A" version includes a pre-opening feature that provides a two-stage opening process to dampen decompression, reducing switching shocks and noise during operation . ✅ Technical Specifications The table below summarizes the confirmed performance parameters for this valve family, which align with your requirements : Parameter Specification Type SV (Pilot oil return internal / Without drain connection) Nominal Size 20 (NS20 / NG20) Maximum Operating Pressure 315 bar Maximum Flow 350 L/min (The valve series supports up to 550 L/min; your specified 350 L/min is within its capacity) Mounting P – Subplate mounting Pre-opening A – With pre-opening 🔧 Ordering Code Breakdown The valve's specifications are encoded in its model number as follows : SV: Type (pilot-operated check valve with internal pilot oil return). 20: Nominal size (NS20). P: Subplate mounting. A: Version with pre-opening. 1: Cracking pressure code (standard is 2.5 bar for this size; other options like 5, 7.5, or 10 bar are available via code 2, 3, or 4). 4X: Component series 40 to 49 (installation and connection dimensions remain unchanged). For example, the valve with the material number R900587557 corresponds to a model such as SV20PA1-4X/ . Versions with different cracking pressures, like SV20PA2-4X/, are also documented . 💡 Understanding the "A" Version (With Pre-Opening) The version with pre-opening offers distinct operational benefits: Operation: When pilot pressure is applied at port X, the control spool moves, pushing first a small ball poppet off its seat (pre-opening), followed by the main seat poppet . Benefits: This two-stage setup provides dampened decompression of the pressure volume on the actuator side, effectively a
    
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