Bray Flow-Tek S80 Two-Piece Threaded Stainless Ball Valve

Bray Flow-Tek Series S80 two-piece threaded stainless steel ball valve

The Series S80 is a two-piece, full port, threaded ball valve from Bray’s Flow-Tek line, made in investment cast stainless steel. It is a compact, economical isolation valve for process and utility pipework in sizes from 1/4 in. to 4 in. (8 mm to 100 mm), rated 1000 psi WOG (69 bar) and 150 psi saturated steam (10.3 bar). The S80 is designed for the chemical, textile and general process industries, and in practice is also used on air, water, oil and gas lines. Seven Star LLC supplies Bray valves in Oman and the GCC as an independent supplier in Muscat.

S80 technical specifications

What the S80 two-piece construction means in service

A two-piece body is made from a main body and one end cap, screwed together with the ball and seats trapped inside. Compared with a three-piece valve like the Series 5000/6000, it has fewer leak paths and a lower cost, but the valve cannot be opened up without taking it out of the line, because both ends are threaded into the pipe. That makes the S80 well suited to lines where a valve is replaced rather than repaired, such as drains, vents, utility headers and chemical dosing branches. Where in-line repair is wanted, a three-piece valve is a better choice.

The ball is full-port, so the bore matches the nominal pipe size closely and the pressure loss is low. The S80 uses RPTFE seats and an adjustable stem packing, with a blowout-proof stem installed from inside the body. As with all PTFE-seated valves, the temperature and pressure rating are linked: the datasheet pressure-temperature graph shows the working pressure falling as temperature rises toward 450°F, so a hot service must be checked against the curve, not only the nominal rating.

Sizes, dimensions and Cv of the S80

The datasheet gives the face-to-face, port, handle height and Cv for each size, in inches and millimetres. Cv, the flow coefficient, rises quickly with size, from about 10 at 1/4 in. to over 1,400 at 4 in. in the table published. Weight also rises, and a 4 in. valve needs proper pipe support. Port diameters are 11.6 mm for 1/4 in. and 94 mm for the 4 in. valve in the metric table.

These weights are those published in the datasheet’s metric table; the complete table with Cv and handle dimensions is in the attached document.

Where S80 fits in the Flow-Tek and Bray range

The S80 is one of several threaded Bray valves, alongside the S20/FS20, S40, S51 and S70/S90 models, while the 5000/6000 and 7000/8000 are the three-piece designs in the same Flow-Tek family. For flanged lines, the F15/F30 and RF15/RF30 valves are the match. For automation, Bray offers actuators, but this valve’s lever handle is the standard operator; confirm with the supplier before planning an actuator on a threaded valve, since the mounting arrangement is not shown on the datasheet.

Selection and ordering checklist for S80

• Size from 1/4 in. to 4 in., and thread type: NPT, BSPT or BSPP.
• Pressure and temperature, checked against the PTFE seat curve.
• Media compatibility with CF8M stainless steel, RPTFE and the stem packing.
• Handle: standard latch or oval handle, and padlock use.
• Steam duty: the 150 psi WSP rating applies; higher steam pressures need another valve.
• Marking, cleaning and certification documents.

Installation and maintenance of the S80 valve

Apply a thread sealant suitable for the medium to the male pipe thread, not inside the valve, and never over-tighten with a wrench on the body end cap; use the wrench on the end nearest the joint being tightened. Support the pipe on both sides, especially for 2 in. and larger valves with long handles. Operate the valve through a few cycles after installation and check the gland nut for leakage; stem packing may need a small adjustment after the first thermal cycles. Keep the valve fully open or fully closed in normal use. Partly open throttling wears the PTFE seats quickly, and this valve is an isolation valve, not a control valve.

Typical S80 applications in Oman and the GCC

Stainless steel threaded ball valves are used in the Gulf for seawater-exposed instrument and utility lines, chemical dosing and sampling in desalination and water treatment, compressed air and nitrogen on production sites, and hot water and low-pressure steam services in power and process plants. Stainless steel bodies resist the coastal atmosphere and salt-laden dust better than carbon steel. For ambient conditions above 40°C, check the handle sleeve and PTFE packing at routine rounds.

Information to send with an S80 RFQ

• Size, quantity and thread standard.
• Medium, pressure and temperature, including steam or cleaning cycles.
• Handle type and any lockout requirement.
• Material certificates, cleaning or special packing needs.

Documents and quotation

The Bray Flow-Tek Series S80 brochure is attached on this page with dimensions, pressure-temperature data and materials.

Send the size, thread and service data and Seven Star LLC will confirm the S80 configuration and quote supply to Oman and the GCC.