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Bray Actuators

Terms in this set (45)

The Bray Series 92/93 Pneumatic Actuators feature a ____________
double piston, rack and pinion mechanism designed to automate quarter turn valves.
In the series 92 Double-Acting Actuator, Pressure introduced through port A forces _________
the pistons away from each other and rotates the pinion CCW.
Normally, the clockwise rotation (pistons moving together) closes the _______
attached valve, and the counterclockwise rotation (pistons moving apart) opens the attached valve.
In the Series 93 Spring-Return Actuators, spring cartridges have been ___________
added to push the pistons together by spring force upon loss of air pressure. This spring force normally closes the attached valve.
on bray actuator the operator may be set to _________
fail open
The recommended operating medium on bray valve is ____________
clean, dry compressed air, 40 - 140 psig. An airline lubricator is suggested for fast cycling applications.
bray actuator ... The recommended operating temperature range is
20º F to 200º F.
Below 32º F care must be taken to prevent
Consider the use of an air dryer if the device is installed in a cold location.
Actuator Set-Up and Installation on bray actuator... the direction of ___________
operation may be changed to fail open by any one of several different methods.
Fail Open Method 1:
Mounting the Actuator Perpendicular to the Pipeline.
method 1 fail: Notice: Mounting the Actuator perpendicular to the Pipeline works only with
concentric disc valves that allow the disc to be swung through the seat.
method 1 fail: Turn the actuator so _______
the long side is perpendicular to the pipeline. This will allow the spring cartridges to rotate the valve stem clockwise to open, and the air stroke to rotate the valve counter-clockwise to close.
easiest method if there is sufficient room to mount the actuator is __________
Fail Open Method 1
Fail Open Method 2: Rotating the Pinion Notice: Rotating the pinion works only with _____________
concentric disc valves that allow the disc to be swung through the seat.
Fail Open Method 2 procedure is _____
*Remove the End Caps, Spring Cartridges, and Pistons from the Actuator.

*Remove the Pinion, rotate it 90º, and reinstall the pinion in the actuator.

*This will allow the spring cartridges to rotate the valve stem counter-clockwise to close.
method 2 is second easiest method, and allows the _________
actuator to be mounted with its long side parallel to the pipeline.
Fail Open Method 3: Reversing the Pistons is described as __________
Reversing the Pistons works for all valves, but must be used with offset disc valves where the disc may only turn clockwise to close.
fail open method 3 allows what _____________
actuator to be mounted with its long side parallel to the pipeline, with clockwise to close rotation maintained.
method 3 procedure is ______
Remove end caps, Spring Cartridges and Pistons from Actuator.

*Rotate the pistons so that the Racks turn the Pinion counter-clockwise as the Pistons move toward each other.

*(With the air input ports of the actuator body facing you, the left hand piston rack should be on the side with the air ports)
The actuator is attached to the valve by means of the _____
studs and nuts furnished in the mounting kit.
Thread the studs into the proper __________ before ___________
Thread the studs into the proper holes in the actuator, before installing the actuator on the valve.
The studs should be _____________
snug in the bottom of the tapped holes; there is no need to torque them.
Install the actuator on the valve making sure that the base of the actuator fits ________
flat against the valve
Use the nuts and washers from the kit to ___________ and then you will ___________
Torque the nuts in a diagonal pattern to assure equal loading of the studs.
The final step in the installation process is to check the
travel stop settings
travel stops are set for __________
90º of travel at the factory; however, each installation is different so they should be checked before putting the valve in service.
The actuators are designed with a nominal ___________
5º over or under travel at each end of rotation.
A screwdriver and open end wrench, of the appropriate size are the only tools ____
required to make the necessary adjustments.
Before setting the travel stops, the air supply must be
completely disconnected from the actuator, and all compressed air stored within the actuator must be released.
Auxiliary devices connected to the actuator such as tubing, ball valves, solenoid air valves, valve positioners, etc. can ____________
block the release of air from within the actuator.
Do not rely upon the features or controls of
any auxiliary device to release the air from inside the actuator to render it safe for disassembly.
setting the travel stops steps: 6 steps
1. Remove the black Position Indicator Pointer (23) to expose the wrench flats on the top of the pinion (3). 2. Rotate the valve to the desired position by using a wrench on the wrench flats on the top of the Pinion (3). 3. Loosen the Lock Nut (12) on the Travel Stop Screw (13). It is not necessary to remove the nut completely. 4. Using the hex wrench, turn the screw in or out until the desired travel stop position is reached. 5. While holding the screw with the hex wrench, tighten the Lock Nut (12) with the box end wrench. 6. Replace the Position Indicator Pointer (23) making certain the pointer is aligned with the position of the valve, open or closed.
Some valves or operating conditions require that the actuator have more than what percent of travel adjustment?
5º of travel adjustment.
Some valves or operating conditions require that the actuator have more than 5º of travel adjustment. For these conditions, the Series 92/93 actuator can be __________
fitted with extended travel stops in the end caps.
Spring return actuators may be operated with only __________
* one air supply connected to Port A, since the spring cartridges will return the pistons when the air pressure is removed.

* This operation, however, will draw the surrounding atmosphere into the spring chambers through Port B.
Notice: To prevent contamination from entering the spring chamber, actuators configured to operate with one _______
air supply connected to Port A should be equipped with a 40 micron (or finer) filter element installed in Port B.
Even better service may be obtained on spring return actuators by installing what?
a four-way solenoid, covering both Port A and Port B
A four-way solenoid will fill the what?
spring chambers with compressed air from the plant air supply with each stroke.
The plant air supply is often cleaner than the surrounding ____________
atmosphere, especially in heavy industrial or chemical areas.
Bray actuator maintenance: Dirt, rust and water are the most common causes for ____________
shortened service life, and typically enter the actuator through the air supply line.
Routine maintenance of Series 92/93 actuators consists primarily of ____
maintaining the air supply system by changing the filter elements before they start bypassing, adding oil to lubricators before they run dry, and preventing water from entering the air lines.
The second most common cause of shortened service life is ________
misalignment between the valve and the actuator. This can cause premature failure due to excessive side loads on the bearings and gear teeth.
Notice: To lengthen service life, the mechanical connection between the actuator and the valve should be _________
verified to be properly aligned and free to rotate throughout the full range of valve travel.
Easiest assembly will result from lubricating all bearings and seals as they are installed. Lubricant should be
a high pressure petroleum grease with a lithium based thickener which meets NLGI grade 2
assembly of bray valve steps: 6
1. Install Bearing Rings (6 & 7) and O-rings (21 & 22) in their appropriate grooves on the Pinion (3).

2. Insert the pinion through the large hole in the center bottom of the valve body.

3. With the Pinion part of the way into the body, slide the cam (16) over the pinion being careful to align the punch mark on the cam with the punch mark(s) on the pinion. For normal installation and rotation (Fail Close), align the single marks. For Fail Open operation (Method 2) align the single mark on the cam with the two marks on the pinion. For Fail Open operation (Method 3) align the single marks. Actuator Maintenance Assembly Pipefitting Training Air Operated Valves SECTION 05: BRAY ACTUATORS (CONT.) PTC-P02-02.00 33 12/11/2012

4. Install the spacer (15) above the cam. Then insert the pinion through the hole at the top of the body and secure it with the washer (9) and retaining ring (8).

5. Travel Stop Screws (13) - Slip the O-ring (14) over the flat end of the screw until it is 5-7 threads from the end. Thread the screw into the hole in the body, flat end first. Repeat these steps for the second screw.

6. Thread the lock nuts (12) onto the screws and tighten the nuts against the body. This will seal the threads for testing. It is not necessary to set the travel stops at this time, as they may have to be reset when the actuator is installed on the valve.
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