FITOK BHSS-FNS4-R07 3-Piece Ball Valve, 1/4 in. Female NPT

BHSS-FNS4-R07 is a FITOK BH Series 3-piece ball valve in cast CF8M stainless steel with 1/4 in. female NPT ports at both ends and a reinforced PTFE seat. The product page lists it at 2,500 psig (172 bar) between -20 F and 450 F (-28 C and 232 C) with a 0.28 in. (7.1 mm) orifice and a flow coefficient Cv of 3.8.

A compact three-piece valve for instrument and process isolation

The BH Series is FITOK’s heavier 3-piece body design: the body, two end connections and the bolted joint can be separated for seat and seal replacement without removing the end connections from the line, a point the catalog supports with a field seal kit for every orifice size. In the code, BH is the series, SS selects the 316 stainless body (CF8M casting), FNS4 means 1/4 in. female NPT, R marks the reinforced PTFE seat and 07 is the orifice code for 0.28 in.

The catalog describes a floating ball paired with disc-spring-loaded seats that compensate for seat wear and for pressure and temperature changes, plus a blowout-proof stem that limits failures from stem movement or looseness. Each valve is leak tested at the factory with nitrogen or compressed air at its rated pressure.

Features stated in the catalog

• Working pressure up to 3,000 psig (207 bar) for the series and working temperature of -20 F to 450 F (-28 C to 232 C); this exact code is rated 2,500 psig on its product page.
• Maximum-flow design with Cv up to 130 across the series; Cv 3.8 for the 0.28 in. orifice of this code.
• 2-way or 3-way flow patterns; add -3 for the 3-way version of a given connection.
• Fire-safe, low-temperature, locking-handle and actuator-ready (no handle) versions are available through suffixes.

Technical specification

Specification of BHSS-FNS4-R07

Selecting the seat, pattern and special options

Seat choice is the main decision. The catalog lists PTFE as the default, reinforced PTFE (R) and PEEK (P) as alternatives; the seat designator is placed before the orifice number in the code, so BHSS-FNS4-07 and BHSS-FNS4-R07 differ only in the seat. Seat kits are ordered as BHSS-4-RK for orifice codes 05 and 07 (the catalog example for other seats adds R or P in front of the size).

For hazardous or fire-exposed lines the catalog offers a fire-safe build by adding -IE (for example BHSS-FL16-22-IE). That version is API 607 and ISO 15848-1 certified per the catalog, uses graphite stem packing and a live-loaded disc spring, and is rated 1,500 psig between -40 F and 400 F; it is listed for orifices 0.19 in. to 1.25 in. Add -L for a locking handle (5.0 mm locking hole), -LT for low-temperature service and -AM for a valve supplied without handle for direct actuator mounting.

Handling and maintenance notes

Dimensions are shown with tube fitting nuts finger-tightened and are for reference; where this code uses plain NPT ports, thread sealant selection and tightening should follow the piping specification of the plant. The catalog notes that wetted components are listed in italics in the materials table and that other materials can be requested from the manufacturer.

Because the body is three-piece, the middle section can be unbolted for inspection while the end connections stay in the line. Seal kits contain the seat, disc spring, stem bearing, lower and upper packing, stem spring and packing support; a different seat material is chosen by adding the designator to the kit number.

Where this valve is used

General engineering note: a 1/4 in. stainless female-NPT ball valve is typically specified for instrument isolation, sample take-off, chemical injection and utility lines in refineries, gas plants, desalination and power stations, where stainless steel is chosen for coastal humidity and salt-laden air. Confirm fluid compatibility, rating and certification requirements against the project specification.

Related FITOK items

Related items in the same catalog section: the 2-way and 3-way BH sizes above, the BG Series 3-piece valve, the fire-safe -IE version, locking and actuator-ready variants, and the Cv-based sizing data. Compatible instrument fittings and manifolds from FITOK can be quoted on request.

Frequently asked questions

What does the R in BHSS-FNS4-R07 mean?

It is the seat designator for reinforced PTFE. PTFE is the default seat without a letter, and P stands for PEEK.

What pressure and temperature range is listed?

2,500 psig (172 bar) from -20 F to 450 F (-28 C to 232 C) for this code, within the series maximum of 3,000 psig.

Can this valve be ordered fire safe?

Yes: the catalog adds -IE for an API 607 and ISO 15848-1 certified fire-safe build, rated up to 1,500 psig between -40 F and 400 F.

Does the 0.28 in. orifice apply to other sizes?

The 0.28 in. orifice (Cv 3.8) covers 1/4 in. NPT and 3/8 in. FITOK end connections in the catalog table.

Is Seven Star LLC a FITOK distributor?

No. Seven Star LLC is an independent supplier in Muscat that sources FITOK products on request.

Documents and quotation

The official FITOK datasheet and user manual for BHSS-FNS4-R07 are hosted on this page for download. Seven Star LLC is an independent supplier in Muscat; send your quantity and delivery location through the quotation form and we will quote this item. Please confirm the exact order code, supply voltage and output options against the documents before ordering. More related products: product category.