- Automation & ControlView all 2,255 products
- Automation Accessories
- AC Drives
- PLC & I/O Cards
- Industrial Communications
- Vibration Monitoring
- Controllers & Data Acquisition
- Isolator & Barrier
- CCTV & Security
- Safety Switches & Guard Locking
- Encoders
- Motor Soft Starters
- HMI Displays
- Pneumatic Cylinders
- Industrial Computers
- Servo Drives
- Machine Vision
- Automation Software
- Robotics
Brand: Bray International
Bray Flow-Tek S70/S90 Two-Piece Threaded Ball Valve, 2000 psi
Description
Bray Flow-Tek Series S70/S90 two-piece threaded high pressure ball valve
The Series S70 and S90 are two-piece, standard port, threaded ball valves from Bray’s Flow-Tek line, built for high working pressure in a small valve. They are rated up to 2000 psi WOG (137.9 bar) in the smaller sizes, with sizes from 1/4 in. to 3 in. (8 mm to 80 mm), and share the same design with different body materials: the Series S70 is the 316 stainless steel version (ASTM A351 Gr CF8M) and the Series S90 is the carbon steel version (ASTM A216 Gr WCB). Because the pair is bought together, we describe the family as S70/S90. Seven Star LLC supplies Bray valves in Oman and the GCC as an independent supplier in Muscat.
S70/S90 technical specifications
| Parameter | Specification |
|---|---|
| Manufacturer / part number | Bray Flow-Tek / Series S70 (stainless) and S90 (carbon steel) |
| Size range | 1/4 in. to 3 in. (8 mm to 80 mm) |
| Pressure rating | 1/4 to 1 in.: 2000 psi WOG (137.9 bar); 1-1/4 to 2 in.: 1500 psi WOG (103.4 bar); 2-1/2 to 3 in.: 1000 psi WOG (68.9 bar) |
| Steam rating | 150 psi WSP (10.3 bar) |
| Temperature range | S70: -50°F to +450°F (-46°C to +232°C); S90: -20°F to +450°F (-29°C to +232°C) |
| Body and end cap | S70: ASTM A351 Gr CF8M; S90: ASTM A216 Gr WCB |
| Ball | ASTM A351 Gr CF8M (both); hard chromium plated per website |
| Stem | Type 316 stainless steel, internal bottom entry, blowout proof |
| Seats, body seal, packing | RTFE / RPTFE |
| Port | Standard port |
| End connection | Threaded NPT |
| Standards | Design and test to MSS SP-110 (and MSS SP-72 listed on the website) |
| Vacuum service | Up to 29 in. Hg gauge |
| Handle | Stainless steel safety latch handle with locking device; anti-static device fitted |
S70 versus S90: stainless or carbon steel body
The only difference in the bill of materials between the two is the body and end cap, and the stem material noted in the brochure. S70 uses investment cast stainless steel, solution annealed, which can be used down to -50°F and resists corrosion in water, chemicals and coastal air. S90 uses cast carbon steel, normalized and black phosphate coated, with a lower limit of -20°F, and is a lower-cost choice for hydrocarbon, hydraulic and utility lines in carbon steel pipework. The ball is stainless steel in both, so the trim is the same.
The pairing matters for spare parts. Seats, body seal, thrust washer and packing are common, so a repair kit for one body material can serve the other in the same size. Plants that run both stainless and carbon steel piping often standardise on one family to reduce the number of different spare kits.
How the high-pressure two-piece design works
The valve body is made in two pieces: the main body, containing the ball, seats and stem, and an end cap screwed into it. The threaded closure is manufactured to close tolerances so that the joint stays sealed at pressures up to 2000 psi in the small sizes. The stem enters from the bottom and has a shoulder, so line pressure pushes it against the body instead of out of it. An adjustable packing gland compensates for wear, and an anti-static device bonds the ball and stem to the body to bleed static charge during flow of dry gases or hydrocarbons.
Standard port means the bore is smaller than the nominal pipe size, so the Cv is lower than in the full port S80 of the same size and the pressure drop is higher. The brochure gives flow coefficient, dimensions and weight per size. In long pipelines or where flow is critical, a full port valve should be checked instead.
Pressure rating by size, and why it falls
| Size | Rating (WOG) |
|---|---|
| 1/4 in. to 1 in. | 2000 psi (137.9 bar) |
| 1-1/4 in. to 2 in. | 1500 psi (103.4 bar) |
| 2-1/2 in. to 3 in. | 1000 psi (68.9 bar) |
The reduction in pressure rating by size is a normal feature of threaded valves, since the end cap thread and body wall carry a larger load as the bore grows. These are cold working pressure ratings; at 450°F the RTFE seat limits the allowable pressure, and the pressure-temperature curve in the brochure must be consulted for hot services.
Selection and ordering checklist for S70/S90
- Body material: S70 stainless steel or S90 carbon steel, including minimum temperature.
- Size and thread: 1/4 to 3 in. with NPT end connections.
- Working pressure at the maximum temperature, including pressure peaks and hydrotest.
- Media compatibility with RTFE seats and packing and the ball material.
- Need for standard or full port: if low pressure drop is needed, compare the S80 full port valve.
- Locking device and handle position requirements.
Installation and maintenance of S70/S90 valves
Use a sealant suitable for the medium on the pipe threads and tighten the valve using the wrench flats nearest the joint. Support the line, because high-pressure small bore lines vibrate. Do not use the valve to throttle; leave it open or closed so that the RTFE seats do not erode. During maintenance shutdowns, the valve is normally replaced rather than opened, as both ends are threaded into the line, but repair kits with seats, seals and packing can be used when the valve is removed. Check the gland nut after the first heating cycle, and test the handle lock.
Typical S70/S90 applications in Oman and the GCC
Instrument impulse lines, hydraulic power units, chemical injection, compressed air and gas headers on oil and gas sites often use small-bore valves at high pressure. S70 stainless valves are common in coastal and offshore-type conditions where carbon steel corrodes, and S90 carbon steel valves serve dry utility and lubrication systems. Thread sealant and vibration are the usual causes of leakage in the field, so supervise the installation on high-pressure lines.
Information to send with an S70/S90 RFQ
- Series (S70 or S90), size, quantity and thread.
- Medium, pressure and temperature.
- Vacuum, steam or oxygen service flags.
- Certificates or cleaning required.
Documents and quotation
The Bray Flow-Tek Series S70/S90 brochure is attached on this page with dimensions, materials and pressure-temperature data.
Send the series, size and pressure data and Seven Star LLC will confirm the S70/S90 configuration and quote supply to Oman and the GCC.
Datasheets & Documents
- Brochure Bray S70/S90 Brochure Download
Reviews (0)
About brand
Bray International is the Houston-based maker of butterfly valves, knife gate and slurry valves, actuators and valve controls. It was incorporated in Houston on 23 April 1986, founded by Craig C. Brown and Frank J. Raymond, and assembled its first butterfly valves in 1987. Among them were the Series 20/21, 30/31 and 35/36 resilient-seated valves that are still in its range.
Seven Star LLC is an independent supplier in Muscat. We list Bray valves, actuators, positioners and switch boxes, and supply complete automated valve packages and spare parts to water, oil and gas and process plants in Oman and the GCC.
Bray at a glance
| Established | 23 April 1986, Houston, Texas, by Craig C. Brown and Frank J. Raymond |
|---|---|
| First products | Series 20/21 sanitary and chemical, Series 30/31 general purpose and Series 35/36 large-diameter butterfly valves, first assembled in 1987 |
| Product families | Resilient-seated, high-performance and triple-offset butterfly valves, knife gate and slurry valves, pneumatic and electric actuators, positioners and valve status monitors |
| Applications | Water and wastewater, desalination, HVAC, chemical, oil and gas, power, mining and slurry service |
Bray products we list
| Family | Models | Typical use |
|---|---|---|
| Resilient-seated butterfly valves | Series 20/21, 22/23 PTFE-lined, 30/31, 32/33, 35/36, 3A/3AH | Water, seawater, HVAC and general utility isolation; PTFE-lined for corrosive chemicals |
| High-performance and triple-offset butterfly valves | McCannalok 40/41, Tri Lok | Higher pressure and temperature, steam, hydrocarbons and tight shut-off |
| Knife gate and slurry valves | 740, 755, 941, 762, 765, 767, 768 | Slurries, sludge, pulp, mining tailings and wastewater solids |
| Actuators | Series 92/93 rack and pinion, Series 98 scotch yoke, Series 70 electric | Automating quarter-turn valves with air or electric power |
| Positioners and switch boxes | 6A, 6P, 5A, 5C Ex d, Series 54 sensors | Modulating control and open/closed position feedback to the control system |
The butterfly valve type follows the duty. Resilient-seated valves seal on a rubber liner, which makes them economical and bubble-tight for water and utilities. High-performance valves use an offset disc and a PTFE or metal seat for higher pressures and temperatures. Triple-offset valves add a third geometric offset so the disc meets the seat without rubbing, which allows a metal-to-metal, zero-leakage seal in steam and hydrocarbon service.
Where Bray valves are used
In Oman and the GCC, Bray valves and actuators are used in water transmission and distribution, desalination and wastewater plants, district cooling and HVAC, petrochemical and chemical plants, power stations and mining and slurry lines.
Ordering Bray valves: what we need
Send the series, size (NPS or DN), end connection (wafer, lug or flanged), body, disc and seat materials, and the medium, pressure and temperature. For actuated valves, add the actuator type (double-acting or spring return), air or electric supply, and any positioner or switch box needed.
Facts checked against Bray company history, October 2026.
Browse Bray International products by category: Control Valves.
FAQ
Questions about the Bray Flow-Tek S70/S90 Two-Piece Threaded Ball
Answers from our engineering team on installation, compatibility and integration.
01What is the difference between Bray S70 and S90 ball valves?
Both are two-piece threaded standard port valves with the same ratings. The S70 has a 316 stainless steel body (CF8M) and the S90 has a carbon steel body (WCB), with S90 limited to -20°F.
02What is the pressure rating of the S70/S90?
The brochure lists 2000 psi WOG (137.9 bar) for 1/4 to 1 in., 1500 psi for 1-1/4 to 2 in. and 1000 psi for 2-1/2 to 3 in. The steam rating is 150 psi WSP.
03Is the S70/S90 a full port valve?
No. It is a standard port design, so the bore is smaller than the pipe and Cv is lower than a full port valve. The Series S80 is the full port two-piece option.
04What end connection does the S70/S90 have?
The brochure lists threaded NPT ends. The two-piece body is screwed into the line, so the valve is normally replaced as a unit.
05Can the S70/S90 be used under vacuum?
Yes. The brochure states vacuum service to 29 inches Hg gauge. Thread sealing and the seat condition should still be checked for the particular application.
Reviews
There are no reviews yet.