FITOK BRSS-FNS8-10 Hex Bar Stock Ball Valve, 1/2 in. NPT

BRSS-FNS8-10 is a FITOK BR Series ball valve machined from 316 stainless steel hex bar stock, with 1/2 in. female NPT ports at both ends. The product page gives a working pressure of 1,000 psig (69 bar), a temperature range of -20 F to 450 F (-28 C to 232 C), a 0.35 in. (8.9 mm) orifice and a flow coefficient Cv of 5.3.

A bar stock body for compact 1/2 in. instrument and utility lines

The code reads as a series, a material, a connection and an orifice: BR is the hex bar stock ball valve series, SS selects 316 stainless steel, FNS8 means a 1/2 in. female NPT thread on each side and 10 is the orifice code that corresponds to 0.35 in. Because the body is cut from hex bar, the hexagon doubles as a wrench flat, which helps when the valve must be held steady while a male pipe thread is tightened into the port.

Compared with a cast three-piece valve, a bar stock valve has a smaller outline for the same bore. The overall length is 2.08 in. (53.0 mm) and the body hex measures 15/16 in. (24.0 mm) across flats, so the valve fits between closely spaced pipework on skids and panels.

What the product page confirms

• Body in 316 stainless steel with female NPT x female NPT ends in 1/2 in. size.
• Working pressure of 1,000 psig (69 bar) at the temperature range -20 F to 450 F (-28 C to 232 C).
• Cv of 5.3 through a 0.35 in. (8.9 mm) orifice.
• Quarter-turn operation, so open and closed positions are read from the handle.

Technical specification

Specification of BRSS-FNS8-10

How to read the order code and choose the right size

Check the three pieces of information that matter for a replacement: the thread type, the size and the pressure. The code fixes a 1/2 in. NPT thread, so a mating male fitting must also be NPT; a BSP or ISO thread will not seal reliably in an NPT port. For tube connections the same series is offered with other end codes, which would replace FNS8 in the code.

Compare the Cv and the orifice with the flow your line needs. At Cv 5.3 the valve passes 5.3 US gallons per minute of water at a 1 psi drop, and the 0.35 in. orifice is smaller than the 1/2 in. pipe bore, which matters for slurries or viscous fluids where a full-bore valve may be preferred.

The 1,000 psig rating is lower than the 2,500 psig of the three-piece BH valve in the same catalog family, so verify that the maximum line pressure including relief set points stays inside the rating at the operating temperature.

Installation notes

Use thread sealant or PTFE tape that suits the service fluid and apply it to the male thread only. Hold the valve by the hex flats, not by the handle, while tightening, and avoid overtightening because a tapered thread acts as a wedge in a female port.

Cycle the valve before commissioning to confirm that the handle turns through a full quarter-turn. A ball valve is intended for on and off duty; throttling flow with the ball partly open wears the seat unevenly and shortens its life.

Typical uses in Oman and the GCC

General engineering note: a stainless 1/2 in. valve at this pressure suits instrument air headers, cooling-water and chemical dosing take-offs, sample points and utility isolation in desalination, power, oil and gas and petrochemical plants. Stainless steel is often selected where coastal humidity and salt-laden air attack carbon steel. Fluid compatibility and certification requirements should be checked against the project specification.

Related FITOK items

FITOK also lists three-piece BH valves, trunnion-mounted BF valves, needle valves, check valves and manifolds in separate catalogs. Matching fittings and pipe nipples in 316 stainless steel can be quoted together with this valve on request.

Frequently asked questions

What do the letters and numbers in BRSS-FNS8-10 mean?

BR is the bar stock ball valve series, SS is 316 stainless steel, FNS8 is a 1/2 in. female NPT connection and 10 is the orifice code for 0.35 in.

What is the maximum pressure of this valve?

The product page lists 1,000 psig (69 bar) between -20 F and 450 F (-28 C and 232 C).

What is the flow coefficient?

Cv is 5.3 for the 0.35 in. (8.9 mm) orifice.

Can the valve be used to throttle flow?

Ball valves are designed for on and off service; partly open operation is not recommended because it wears the seat.

Does Seven Star LLC act as a FITOK distributor?

No, we are an independent supplier in Muscat and supply FITOK items on request rather than acting as a FITOK channel partner.

Documents and quotation

Download the official FITOK datasheet and manual for BRSS-FNS8-10 from this page. As an independent supplier based in Muscat, Seven Star LLC supplies FITOK items on request: use the quote form with the quantity you need. Check every value in the documents against your own specification before you order. Browse similar items in the category.