Designed around a sliding guided piston mechanism, the V Series Guided Piston Relief Valve, Cast Iron, 1 NPT Ports, Spring, Up To 25.00 GPM from Fulflo Specialties Co delivers stable pressure control across a wide range of industrial fluid applications. The guided piston design minimizes response to transient pressure surges, reducing the chatter, pounding, and squealing common in conventional direct-acting relief valves.
The cast iron housing paired with a hardened steel piston and Buna-N seals supports use with hydraulic oils, water, solvents, and chemicals across varying viscosities. Ports are 1 NPT, the rated flow capacity is 25 GPM, and the spring is calibrated for a pressure range of 150–350 PSI. Unlike poppet or ball check designs, this valve modulates flow progressively rather than snapping open at cracking pressure, providing more linear pressure-flow behavior suited to both load regulation and system protection.
Note: These valves are not intended as positive shut-off devices and are not suitable for use with air, gas, or steam.
SKU: VJ-5-YS-190PSI
Supplier Part Number (MPN): VJ-5R
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Specifications
AA
2.28
Adjustment
No
B
2.28
C
2.06
Check Valve
No
Diode
No
Brand
Fulflo Specialties Co
Brand
Fulflo Specialties Co
Pack Size
1.00
UOM
EA
Electrical Flag
No
Features
8.22
Housing
Cast Iron
Piston
Hardened Steel
Ports
1 NPT
Ports
1 NPT
Pressure Range (psi)
507-YS (150-350 PSI)
Rated Flow
25
Rated Flow
25
Remote Control
No
Seal Material
Buna-N
Supplier Part Number
VJ-5-YS-190PSI-SMC
Switch Connector
No
Product Weight
5.40 lbs
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Seal Material
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AA
B
C
D
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VJ-5-YS-190PSIV Series Relief Valve
1 NPT
25
Cast Iron
507-YS (150-350 PSI)
Hardened Steel
Buna-N
8.22
2.28
2.28
2.06
VJ-7-XSV Series Relief Valve
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Cast Iron
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Hardened Steel
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2.88
Product Questions & Answers (1)
Question by: Bobby P on Dec 31, 2025, 7:27 PM
Reckon this would be alright for hydraulic oil? I don't want it eating up the seals.
Answer by: Customer Support on Jan 2, 2026, 6:34 AM
Yes, Buna-N seals are compatible with hydraulic oils. The valve housing is cast iron and the piston is hardened steel, all suitable for use with hydraulic fluids.