Shafer RAP R70-Shafer Limit Valve Installation and Adjustment Manuals & Guides

RAP R70: Installation and Adjustment Procedure

Limit Valve Inst
05/09/11

Shafer Limit Valve

Installation and Adjustment Procedure

RAP R70: Installation and Adjustment Procedure

Limit Valve Inst

05/09/11

The purpose of this procedure is to guide the installation of a Shafer Limit Valve to an existing
Rotary Vane Actuator.

This procedure is to be used in conjunction with the following Maintenance and Service
Manual.

Shafer Rotary Vane Maintenance and Service Manual Bulletin RVSM-3/98
Poppet Block Control Maintenance and Service Manual Bulletin PBC-01101001
Your Shafer Hydraulic Schematic

Shafer Limit Valve

Preparation

In the following procedure, information in ( ) is descriptive.

WARNING: Before beginning work on a Shafer Actuator Valve Operating System or any

actuator using pressurized gas:

1. Turn power gas off.

2. Bleed down the power storage tank if applicable.

3. The pressure gage on the poppet control block must read zero.

ESD Valve Installation

1. Remove the existing Lube Extension,
if applicable. (See Figure 1.)

2. Remove the two hex head cap screws
holding the Protective Cover and
remove the existing Protective Cover.

3. Replace the Garlock Packing retained
by the Protective Cover.

4. Install the new Protective Cover using
the new Cap Screws and Lock
Washers supplied. Ensure the
direction arrows are in the correct
position.

5. Install the new Lube Extension, if
applicable.

Figure 1

1

RAP R70: Installation and Adjustment Procedure

Limit Valve Inst

05/09/11

Shafer Limit Valve

6. Install the Limit Valve Mounting
Plate supplied, using parts in the
Limit Valve Mounting Kit.
Clearance holes, used for
mounting, are labeled for
installation on different size
actuators in Figure 2.

7. Install the ESD Valve in the
position that will result in the
desired action. Looking down on
the top of the Actuator, the valve
mounts to the left of the shaft to
control a Fail Close stroke and to
the right of the shaft to control a
Fail Open stroke. (See Figure 3

Figure 2

below.)

8. Using your Hydraulic Schematic
as a guide, run tubing to the ESD
Valve.

Adjusting a Limit Valve

1. Before trying to adjust a Limit
Valve, use the Shafer Hand Pump
to position the actuator so that the
pin on the Protective Cover is
away from the paddle. (See
Figure 3.)

2

Figure 3

RAP R70: Installation and Adjustment Procedure

Limit Valve Inst

05/09/11

Shafer Limit Valve

2. Remove the Protective Boot
(Item 1). (See Figure 4.)

3. Loosen the Lock Nut (Item 2)
and back the nut away from
the nubbin shaped Adjusting
Cap (Item 3). (See Figure 4)

4. Screw the Adjusting Cap
(Item 3) onto the Stem (Item

4) as far as possible.

5. With the control in the failed
condition (see your hydraulic

Figure 4

schematic), open Power Gas.

6. The Stem (Item 4) should
extend to its maximum travel
out of the Valve Body.

7. The Actuator will stroke to the
end of the stroke as designed
(see your schematic for
position). This is where the
Limit Valve should operate.
(See Figure 5.)

8. Turn the Adjusting Cap (Item

3) counterclockwise until it is
against the Paddle. Follow
with the Lock Nut (Item 2), but
do not tighten yet. Leave the
Lock Nut against the
Adjusting Nut (3).

9. Put the actuator control back
in run condition and stroke the
actuator, with the hand pump,
until the pin is away from the
paddle.

10. Turn the Adjusting Nut
counterclockwise until the
distance between the
Adjusting Nut and the Lock
Nut is close to 3/8". (See
Figure 6)

Figure 5

Figure 6

3

RAP R70: Installation and Adjustment Procedure

Limit Valve Inst

05/09/11

Figure 7

Shafer Limit Valve

Caution: Use caution not to over stroke the Limit Valve. If the adjusting cap is

adjusted away from the valve too far, resulting in the paddle trying to stroke
the valve past its limits, the poppet will be destroyed in the valve. (See Figure

7)

11. Lock the Adjusting Cap in place by tightening the Lock Nut against it. Do not move the
Adjusting Cap while locking.

12. Test the valve to determine if it is activates at the end of stroke and the control is
neutralized. If so, adjustment is complete and the Protective Boot can be reinstalled
after packing stem area with light grease.

13. If the valve does not work correctly (there is an audible sign that power gas is leaking
out of the exhaust of the poppet block) or there has been adjustment made to the
actuator stops. Adjust the valve in small increments until the control is neutralized at
the end of the stroke. The stroke of the valve must not exceed 7/16"; see Caution
above and Figure 7.

4

RAP R70: Installation and Adjustment Procedure

Limit Valve Inst

05/09/11

Shafer Limit Valve

If any further information is required, please feel free to contact:

Emerson Process Management Valve Automation Inc.

2500 Park Avenue West

Mansfield, Ohio 44906

Phone: [phone]
Fax [phone]

Please visit our website for up to date product data. www.shafervalve.com

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