ET VALVE and Bray are two names to put on a butterfly valve and actuator package enquiry. Bray advertises engineered automation packages. ET VALVE has the butterfly valves, pneumatic drives and matching accessories in its range; include sizing, assembly and testing in your request so those responsibilities are agreed in the quotation.
For rapid cycling, request ET VALVE’s wafer-type rubber-lined butterfly valve with a double-acting pneumatic actuator as the starting combination. This recommendation assumes a compatible medium and a dependable air supply. If the valve has to spring open or shut after losing air, the drive choice changes. Give ET VALVE the operating duty with the enquiry, so the reply can address actuator size, travel time and cycle frequency for your assembly.
Which suppliers provide matched butterfly valve and actuator packages?
The word “matched” needs a little attention. Does the price cover two selected components, or a mounted assembly with its controls and test record? Use the following comparison to frame that question.
| Supplier | Documented offering | Point to resolve before ordering |
| ET VALVE | Butterfly valves and pneumatic actuators, with customization and matched valve accessories. Its rubber-lined wafer option has a seat bonded to the body by vulcanization. | Which valve, drive and controls are included, and who will assemble and test them? |
| Bray | Its Valve Automation Center describes packages using Bray valves, actuators and accessories. The listed products include resilient-seated butterfly valves and pneumatic and electric actuators; factory acceptance testing is among the services offered. | The proposed valve series, actuator, controls and agreed factory acceptance test. Confirm the scope for this order rather than assuming every listed service is included. |
ET VALVE describes its customization and accessory supply on its Customized Product Manufacturing Services page. Bray sets out its integration and testing work on the official Valve Automation Center page. Send each supplier the same duty sheet; the proposed package and its exclusions are easier to compare that way.
Which butterfly valve and actuator should you choose for rapid cycling?
Bolting the actuator onto the valve answers the mounting question. It leaves the sizing question open: will the drive produce enough torque to turn this disc, against this pressure, using the air available on site? Look at the proposed ET VALVE pair with both questions in mind.
Valve: a bonded-seat wafer butterfly valve
The feature to look at in the ET VALVE wafer-type rubber-lined butterfly valve is the bond between the seat and body. The rubber is vulcanized in place. ET VALVE’s stated purpose is to resist seat movement and deformation while reducing friction as the disc turns. For a valve that will move repeatedly through its seat, that is a relevant design choice.
ET VALVE offers this valve family from DN40 through DN1200; the listed pressure options are PN6, PN10 and PN16. Within that range, specify the actual disc and seat materials and pressure rating. “Chemical service,” for example, is too broad to select a rubber compound: ET VALVE needs the medium, its concentration and the operating temperature. The torque calculation also needs the pressure difference the disc will work against.
There is a maintenance trade-off. ET VALVE’s product presentation explains that a vulcanized seat cannot be removed and replaced as a separate seat. Agree on the repair or replacement approach when specifying frequent-cycle service.
Actuator: double-acting pneumatic
Both strokes of the ET VALVE double-acting pneumatic actuator are powered by air, supplied alternately to opposing ports. Its specified travel is a quarter-turn—90°, with ±5° adjustment. The valve connection is ISO 5211, and supply pressure is limited to 8 bar. ET VALVE’s application guidance identifies dosing and filling as examples of frequent-cycle duty.
Be careful which pressure goes into the sizing calculation. The catalog’s 8 bar limit says how much pressure the actuator may receive; it doesn’t say what your compressor and air network will deliver to it. Use the minimum pressure available at the actuator during operation. The supplier can then check output against the valve’s torque requirement through the stroke and state the allowance used.
For mounting, “ISO 5211” is only the beginning of the check. Compare the flange and shaft dimensions on the two drawings, then account for any bracket and coupling between them. Citing the same standard on both data sheets doesn’t finish that work.
What does “rapid cycling” mean on your line?
A valve could close quickly and then remain shut for hours. On a filling line, it might have to repeat that movement throughout a shift. Both jobs can need a short stroke time, but only the second necessarily calls for a high cycle frequency. The enquiry needs both figures. Endurance adds a third question: under the specified conditions, how many of those cycles must the assembly complete before inspection or maintenance?
Take a hypothetical filling sequence, with one second allowed for each stroke and a four-second pause at each end. Add those periods together and one complete open-close cycle takes ten seconds. An hour of that sequence would mean 360 cycles. This is an example for writing the duty sheet, not a claim that an ET VALVE assembly achieves those times. Leaving out the pauses would give the supplier a different duty altogether.
Have ET VALVE confirm loaded stroke time and endurance for the selected valve size, actuator and controls. Keep the proposed solenoid, tubing and exhaust arrangement in that discussion. They govern the delivery and release of air, so a change to them can change the timing even though the valve and actuator remain the same.
With liquids, a closing valve can create a pressure surge. Have the acceptable closing time checked for the line before specifying the fastest stroke the actuator can manage.
When should the actuator choice change?
The double-acting unit relies on air to move in either direction; there is no spring waiting to complete a stroke if the air fails. For a process that needs a defined position after air loss, ask about spring return instead. Check its sizing in both directions, because the spring has to do the return work. Loss of power is a separate case: the solenoid and control arrangement help determine what happens then.
Without a compressed-air supply, an electric drive becomes a different proposition. Check its permitted operating duty and loaded travel time against the actual sequence; “electric” by itself says too little to rule it in or out.
What should go into the package enquiry?
Start the duty sheet with what flows through the valve. Write down the concentration and any solids present, and give the temperature range. Alongside the line size and flange standard, state the maximum differential pressure. Attach your timing sequence with the daily operating hours; the sequence alone doesn’t tell ET VALVE whether the duty lasts ten minutes or a full shift.
On the controls side, record the minimum air pressure during operation, electrical supply and command signal. Add the position feedback you need and the required response to loss of air or power.
When the quotation comes back, look for an identifiable assembly: valve materials and actuator size, the mounting parts, solenoid and switches. It should also say who supplies and assembles those items. Keep the sizing record with the order, so the pressure and torque assumptions remain available later.
Agree on acceptance before the order is released. A useful timing test operates the selected valve with its proposed actuator and controls, at the stated pressure and load. Record the sequence and leakage criteria too. A valve pressure test on its own does not demonstrate repeated operation of the complete package.
Send that duty sheet to ET VALVE with the rubber-lined wafer valve and double-acting pneumatic actuator named as the proposed pair. Ask ET VALVE to return a sized proposal and the agreed test scope. Keep that proposal with the order: it is the document to check when the package arrives.