Spring Kit Procedure for V-3801-8001 Pneumatic Actuators on Threaded Stem VG7000 Series Bronze Valves

Текст документа

Spring Kit Procedure for
            V-3801-8001 Pneumatic Actuators on
        Threaded Stem VG7000 Series Bronze Valves

This procedure describes the recommended method to install the spring
used with the V-3801-8001 Pneumatic Valve Actuators on threaded stem
VG7000 Series Bronze Valves.

Kit Includes
•   one bonnet adaptor
•   spring:
              Spring Ranges         Color Code
                 3 to 6 psi             Red
                 4 to 8 psi             White
                 9 to 13 psi            Blue
•   one upper spring seat
•   one stem extension
•   one stem locking screw (set screw)

Tools Required
•   small blade screwdriver
•   pliers
•   adjustable or 1-1/4 in. open end wrench
•   1 x 1/2 in. plastic, iron, or steel pipe reducer coupling, or
    1 x 1/2 in. copper tube reducer coupling (optional - to aid in spring
    compression)

Part No.14-1086-0, Rev. B                                                          1
© 1996 Johnson Controls, Inc.                                       Printed in U.S.A.
                                                     1 x 1/2 in. Pipe Coupling
                                                     (to aid in assembly)

                                                          Upper Spring
                                                          Seat

                                                               Stem Extension
                                                               (locking screw inside,
                                                               not shown)
                              2-1/8
                              (54)
                                                                Spring

                                                                  Bonnet
                                                                  Adaptor

                        Figure 1: V-3801-8001 Actuator,
                                    in. (mm)

Adaptor and Spring Assembly Procedures
1.   After the valve has been installed or is firmly restrained, thread the bonnet
     adaptor onto the valve bonnet.
2    Using a 1-1/4 inch wrench, tighten the adaptor. Pull the valve stem to the
     full up position. Thread the stem extension onto the valve stem to the
     gauge height of 2-1/8 inch (54 mm). See Figure 1.
3.   Verify that the proper spring has been selected for the desired spring range
     using the color code listed on Page 1.
4.   Use a pliers to hold the stem extension while tightening the locking screw
     with a screwdriver. Place the spring onto the bonnet adaptor. Place the
     upper spring seat onto the spring, lining up the hole with the rectangular
     shape of the stem extension. Using hand pressure, compress the spring
     below the stem extension and rotate 90° (see note). Release the spring,
     allowing the stem extension to nest in the depressed area of the spring
     seat. Verify the spring seat gauge height of 2-1/8 inch (54 mm).
     See Figure 1.
Note:    A 1 x 1/2 in. pipe coupling can be used as an assembly aid on higher
         compression springs. Place the coupling over the spring seat and
         compress the spring using the coupling for better leverage.
5.   Verify that all threaded parts are tightened as described in this document.

2
Actuator Assembly Procedure
The actuator is easily attached to the valve by placing the actuator over the
spring and bonnet adaptor and tightening the set screw. Connect the air line to
the barbed fitting on the actuator. Ensure the spring seat is parallel with the
length of the actuator so it properly nests into the piston cup inside the actuator.

Commissioning Valve/Actuator
When the spring and actuator are installed, check the following items:
1.       Verify that the actuator is tight or secured as described in this document.
2.       Verify that when air is applied to the actuator, the valve stem moves to its
         full up or down position.

Actuator and Spring Removal Procedures
Disconnect the air line attached to the actuator and cap it to prevent control
system operation problems. Make sure that the pressure in the actuator has
been relieved.
For removal, follow the instructions in the Adaptor and Spring Assembly
Procedures section in reverse order.

     !      CAUTION:       The spring under the actuator is attached to the valve
                           stem and is precompressed. Unknown damage to the
                           valve stem may create a hazardous condition.

                                                                                        3
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• V-3801-8001 — Привод

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