- Vibration Monitoring
- Industrial Communications
- PLC & I/O Cards
- Automation Accessories
- Controllers & Data Acquisition
- AC Drives
- Industrial Computers
- Encoders
- Safety Switches & Guard Locking
- Isolator & Barrier
- Automation Software
- HMI Displays
- Motor Soft Starters
- Servo Drives
- CCTV & Security
- Robotics
- Pneumatic Cylinders
- Machine Vision
Brand: Bray International
Bray Series 6A Smart Electro-Pneumatic Valve Positioner
Description
Smart positioner with diagnostics for rotary and linear valves
The Bray Series 6A is a smart electro-pneumatic positioner for linear and part-turn actuators in industrial applications. It converts a 4-20 mA control signal, or a HART, PROFIBUS PA or FOUNDATION Fieldbus signal, into precise valve travel, and adds on-board diagnostics, simple mounting and automatic commissioning. It works on single- and double-acting actuators, on rotary and linear valves, and in control as well as on/off and emergency shutdown duty.
Bray quotes a very low steady-state air consumption of 0.0059 SCFM, a wide stroke range, and a modular design in which options such as a 4-20 mA feedback module, alarm card, limit switches, non-contact sensor or integral volume booster can be added in the field. The pneumatic media Bray lists are natural gas, carbon dioxide, nitrogen and noble gases, in addition to clean instrument air.
Technical specifications
| Parameter | Specification |
|---|---|
| Control signal | 4-20 mA standard; HART, PROFIBUS PA, FOUNDATION Fieldbus options |
| Actuator types | Single- and double-acting; linear and part-turn |
| Safety integrity | SIL 2; suitable for ESD/SIS applications |
| Approvals | FM, CSA, ATEX, IECEx, CCC, INMETRO; intrinsically safe and explosion-proof versions |
| Enclosure rating | NEMA 4X / IP66 |
| Enclosure materials | Polycarbonate, aluminum, stainless steel; pressure-proof aluminum |
| Operating temperature | -22 to +176 deg F (-30 to +80 deg C); optional -40 deg F |
| Air consumption | 0.0059 SCFM steady state |
| Supply air | 1.4 to 7 bar (20 to 101.5 psi); ISO 8573-1 class 2 for particles, dew point and oil |
| Stroke range, linear | 3 to 130 mm (0.12 to 5.12 inch) |
| Angle of rotation, part-turn | 30 to 100 degrees |
| A/D resolution | 0.05 percent or better; transmission error 0.2 percent or less |
| Fail-safe modes | Fail safe (standard); fail freeze and fail to open (optional) |
| Integral volume booster | 1:1 signal reproduction, Cv 2.0 |
| External position detection | Non-contact sensor; distance to valve up to 40 m |
| Weight | About 0.9 kg plastic; 1.3 kg aluminum; 3.9 kg stainless steel; 5.2 kg pressure-proof aluminum |
| Standard diagnostics | Valve performance test (IEC 61298-2), multi-step response (IEC 61514-2), partial stroke test, air leakage, valve jamming, packing wear, seat wear, deposits, stroke and operating hour counters |
Source: Bray datasheet EN_SDS_S6A and the technical data chapter of the Series 6A installation, operation and maintenance manual. Specification details depend on the housing and communication version ordered.
Accessories and mounting options
The positioner can be fitted with a 4-20 mA position feedback module that outputs valve position to the control station, a programmable alarm module with two semiconductor switch outputs, one fault output and one digital input, and mechanical or intrinsically safe inductive limit switches driven by a cam. For heavy vibration, a non-contact solid-state sensor can be built in or mounted externally on the valve, which also helps where the valve is hot, hard to reach or in a harmful atmosphere.
The integral volume booster, which reproduces the pneumatic signal 1:1 at Cv 2.0, gives fast stroking of large actuators with a lower profile and less tubing than a separate booster. Bray lists the 6A, the Series 5A to 5C status monitors and the Series 54 proximity sensors as accessories for its Series 98 actuator.
Selection and what to confirm before ordering
Specify the 6A where continuous diagnostics, fieldbus communication or SIL 2 shutdown service is needed. For simple quarter-turn modulation from a 3-15 psi signal the pneumatic Series 6P is the alternative. Please confirm the communication protocol, enclosure material, hazardous-area certificate needed, fail-safe mode, actuator single or double action and the mounting kit for the actuator in use.
| Model | Input signal | Typical use |
|---|---|---|
| Series 6A (this page) | 4-20 mA, HART, PROFIBUS PA, FF | Smart control and SIL 2 ESD, rotary or linear |
| Series 6P | 3-15 psi pneumatic | Quarter-turn modulating, dampers |
| Series 54 / 5A-5C | None (position sensing) | Open and closed position indication |
Documents and quotation
The Bray datasheet is attached; the Bray page also lists the installation, operation and maintenance manual, quick-start guide, advanced set-up manual and the intrinsically safe selection guide.
See the wider range of valve positioners on our catalogue, or send the model name and order number for a quotation.
Datasheets & Documents
- Datasheet Bray Series 6A Electro-Pneumatic Positioners datasheet EN_SDS_S6A Download
Reviews (0)
About brand
Bray valves are a familiar sight on water, HVAC and general process lines, mostly as rubber-lined butterfly valves with an actuator bolted on top. Bray International, founded in 1986 in Houston, USA, makes butterfly valves, ball valves and the pneumatic and electric actuators that drive them. Seven Star LLC sources and supplies Bray valves and actuators for plants and building services in Oman, including the Series 30/31 and Series 70 listed here.
Bray valves and actuators listed here
Series 30 and Series 31 are the resilient-seated butterfly valves: Series 30 is the wafer body and Series 31 the lug body. They are used for on/off and throttling duty on water, air and other fluids compatible with the seat. The Series 70 is Bray's electric actuator for quarter-turn valves, ordered by torque size and supply voltage, with on/off or modulating control.
Ordering Bray butterfly valves: what we need
For a valve, send the series, size, wafer or lug body, body, disc and seat materials, flange standard and operator type (lever, gear or actuator). For a Series 70 actuator, send the torque size from the nameplate, voltage, and whether it is on/off or modulating. A nameplate photo covers most of this. GCC water projects often specify the seat and disc materials, so quote them exactly.
Browse Bray International products by category: Control Valves.
Related products
Frequently Asked Questions
What input signals does the Bray Series 6A accept?
4-20 mA as standard, with HART, PROFIBUS PA and FOUNDATION Fieldbus communication options.
Is it suitable for SIL applications?
Bray lists SIL 2 and states it is suitable for ESD/SIS applications.
Which actuators does it work with?
Single- and double-acting linear and part-turn actuators on rotary and linear valves.
How low is the air consumption?
Bray prints 0.0059 SCFM in steady state.
What enclosure protection does it have?
NEMA 4X / IP66, in polycarbonate, aluminum or stainless steel, with explosion-proof versions.
Reviews
There are no reviews yet.