FULFLO FVS-3RA-HS-WS FV-Series Hydraulic Bypass Relief Valve: 1/2 Inch FNPT, Viton, 3.03 Bar Set Pressure Product: Hydraulic bypass relief / safety valve Manufacturer: FULFLO Specialties Requested part number: FVS-3RA-HS-WS Series: FV-Series Quantity in inquiry: 5 PCS This product note is prepared for buyers who need to identify and quote a FULFLO FV-Series hydraulic bypass relief valve. The inquiry specifies FVS-3RA-HS-WS with 1/2 inch FNPT inlet and outlet, conventional operation, WCB body material, stainless steel trim, Viton soft goods and a set pressure of 3.03 bar . The equipment tags in the inquiry are PSV service tags, so the quotation should treat this as a technical valve replacement and not only a generic relief valve request. FULFLO FV-Series official PDF page used for product family and application confirmation. Requested Valve Data Item Inquiry / catalog interpretation Manufacturer FULFLO Part number FVS-3RA-HS-WS Valve type Hydraulic bypass relief valve / safety relief service Series FV-Series Size 1/2 inch inlet and outlet Connection FNPT threaded inlet and FNPT threaded outlet Set pressure 3.03 bar, approximately 44 psi Body material WCB / steel body requested Trim Stainless steel requested Soft goods Viton Operation Conventional Quantity 5 PCS How to Read FVS-3RA-HS-WS The FULFLO FV-Series identification chart is useful because the part number itself contains the main construction details. In the requested code, FV identifies the FV-Series valve. S indicates steel material in the catalog coding. -3 corresponds to the 1/2 inch valve size. RA corresponds to Aflas in the standard chart, while the inquiry also states Viton soft goods; this should be clarified because Viton is normally shown as RV in the catalog examples. /HS indicates hardened steel piston. /WS indicates the green WS spring range. This point matters: the email states Viton soft goods, while the part number includes RA. Before ordering, the buyer should ask FULFLO or the supplier to confirm the exact elastomer code required for the process fluid. If Viton is mandatory, the final part number may need elastomer-code confirmation. FV-Series Product Family FULFLO describes the FV-Series as hydraulic bypass relief valves for load regulation and system protection in hydraulic and lubricating systems. The official FV-Series page lists size range from 3/8 inch to 2 inch, pressure range from 2 to 1000 psi, flow rate up to 150 gpm, threaded or flanged connections, and material options such as brass, cast iron and stainless steel. The page also highlights chatter-free operation, mounting in any position and suitability for continuous duty. The official FV-Series PDF explains that these valves are designed to prevent liquid and gas from venting out during normal operation and adjustment. It also notes that the valves are not positive shut-off valves and may pass minimal leakage before the set pressure. This is important for buyers who are comparing the valve with poppet-type relief valves or tight shut-off safety devices. Set Pressure and Spring Check The requested set pressure is 3.03 bar , about 44 psi . The FV-Series standard pressure range chart lists the WS spring range as approximately 30 to 100 psi for the listed valve sizes. That means the requested 44 psi setting is logically within the WS spring range, but the final setting should still be factory confirmed and tested according to the required flow and fluid viscosity. Quotation Checklist Confirm final part number: FVS-3RA-HS-WS or corrected elastomer code if Viton is required. Confirm 1/2 inch FNPT inlet and 1/2 inch FNPT outlet. Confirm set pressure 3.03 bar / approximately 44 psi. Confirm body material WCB or steel equivalent acceptable to the end user. Confirm trim and piston material, especially stainless trim and hardened steel piston. Confirm O-ring / soft goods material for the actual hydraulic fluid or lubricating oil. Ask whether factory set pressure certificate or test report is required. Confirm whether the valve discharges back to tank or pump suction, because installation affects heat and operation stability. Procurement Summary FULFLO FVS-3RA-HS-WS is a specific FV-Series hydraulic bypass relief valve inquiry for 5 pieces. The useful confirmed points are 1/2 inch FNPT threaded connections, 3.03 bar set pressure, FV-Series hydraulic bypass relief service, steel / WCB body requirement, stainless trim, Viton soft goods request, hardened steel piston and WS spring. The main item requiring confirmation is the elastomer code because the written request says Viton while the part-number segment RA normally points to a different elastomer in the catalog identification chart. Source note: This article uses the customer RFQ dated 2026-06-25, FULFLO official FV-Series product page, and FULFLO official FV-Series PDF / identification chart.
