Bettis PressureMatic Pilot Valve Service Manual Manuals & Guides

Service Manual

1"

I-0220 Rev. 4

January 2018

Pressurematic

®

Pneumatic or Hydraulic High/Low Pressure Pilots

Servive Manual

1"

0.5"

I-0220 Rev. 4

Table of Contents

Section 1: Model and Spring Selection

1.1 Scope ............................................................................................................. 8

1.2 Reference Drawings ....................................................................................... 8

1.3 Schematic Diagram of Adjustments ............................................................... 8

Section 2: Adjustment Procedure

2.1 Set Point Adjustment ..................................................................................... 9

2.2 Range Screw Adjustment ............................................................................... 9

2.2.1 For cases with low and high set points .................................................. 9

2.2.2 For cases with low set point only ........................................................... 9

2.2.3 For cases with high set point only ....................................................... 10

Section 3: Pressurematic Set Point Adjustment

3.1 Cases with low and high set points ............................................................... 11

3.2 Cases with low set point only ........................................................................ 12

3.3 Cases with high set point only ...................................................................... 12

Table of Contents

January 2018

Section 4: Range Screw Adjustment

4.1 Procedure .................................................................................................... 13

Section 5: Range Verification Procedure

Section 6: Reassembly

Section 7: Modifying Pressurematic Assembly Type

7.1 Changing from P-AR to P-MR ........................................................................ 18

7.2 Changing from P-MR to P-AR ........................................................................ 18

Table of Contents

3

Operation and Adjustments

January 2018

Operation and Adjustments

Service Manual

I-220 Rev. 4

4

Operation and Adjustments

Servive Manual

I-0220 Rev. 4

Operation and Adjustments

January 2018

Operation and Adjustments

5

Operation and Adjustments

January 2018

Service Manual

I-220 Rev. 4

6

Operation and Adjustments

Servive Manual

I-0220 Rev. 4

Operation and Adjustments

January 2018

Operation and Adjustments

7

increasing pressure

Section 1: Model and Spring Selection

January 2018

Section 1: Model and Spring Selection

1.1 Scope

This procedure describes the model and spring selection of Pressurematic Series 2000,

2200 and 2400. Set point adjustment (Section II) may be done in the eld.

1.2 Reference Drawings

a. APB0570 Pressurematic Assembly (P-AR 2000)

b. APB0579, page 1 of 2, Range Table for Pressurematic P-AR/MR 2200/2000/2400

c. APB0579, page 2 of 2, Range Graph for Pressurematic P-AR/MR 2200/2000/2400

1.3 Schematic Diagram of Adjustments

Service Manual

I-220 Rev. 4

Figure 1.1 Schematic Diagram of Adjustments

low setpoint high setpoint

low range limit high range limit

Based on data tabulated in the Range Table APB0579, select a Pressurematic series and
spring combination to meet the requirements for range limits, span, and/or deadband.
Use the largest piston and softest spring which will satisfy these requirements. This will
minimize deadband.

adjusted span

maximum span

8

Model and Spring Selection

Servive Manual

I-0220 Rev. 4

Section 2: Adjustment Procedure

Section 2: Adjustment Procedure

2.1 Set Point Adjustment

Field/bench Setpoint Verication

Calibration Equipment:

1. N2 bottle

2. HP regulator

3. LP regulator Insert C-0099-10

4. Hose Cut to 3.5 inches2

5. Block and bleed valve

6. Test gauge, 0-1500 psi range
(recommended or range as required)

7. Test gauge, 0-150 psi range

January 2018

2.2 Range Screw Adjustment

The objective is to set the range screw such that the adjusted span will be approximately
centered between the range limits. In the case of high or low set point only, the set point is
to be approximately centered between the range limits.

This is done with housing and trip spring removed and with a dial indicator to indicate
piston position. Adjust the range screw to give 0.020 inch piston travel at the low range

limit pressure. The low range limit may be specied by the customer, but if not, it can be

determined as follows:

2.2.1 For cases with low and high set points

Low Range Limit = (low set point) – [(maximum span) – (high set point) + (low set point)] / 2

where "maximum span" is from Range Table APB0579 for zero range screw turns. If the
calculated low range limit is below that shown in the Range Table for zero range screw
turns, then use the Range table value.

2.2.2 For cases with low set point only

Low Range Limit = (set point) – (maximum span) / 2

where "maximum span" is from Range Table for maximum range screw turns. If the
calculated low range limit is below that shown in the Range Table for zero range screw
turns then use the Range table value.

Adjustment Procedure

9

Section 2: Adjustment Procedure

January 2018

2.2.3 For cases with high set point only

Low Range Limit = (set point) – (maximum span) / 2 – 100

where "maximum span" is from Range Table for maximum range screw turns. If the
calculated low range limit is below that shown in the Range Table for zero range screw
turns then use the Range table value.

Service Manual

I-220 Rev. 4

10

Adjustment Procedure

Servive Manual

I-0220 Rev. 4

Section 3: Pressurematic Set Point Adjustment

January 2018

Section 3: Pressurematic Set Point Adjustment

Set point adjustment for Series 2000, 2200, 2400:

NOTE:

Refer to Pressurematic assembly drawing APB0570.

This is done with the assembly complete and supply air on the pilot valve for P-AR and P-MR
models.

NOTE:

In the eld this requires a calibration kit with the ability to supply high and low setpoint

pressures (eg. nitrogen bottle with block & bleed valve).

3.1 Cases with low and high set points

NOTE:

The low set point must be adjusted rst. It will not be affected by the high set point
adjustment but the high set point is affected when the low set point is adjusted.

a. Set the high trip bolt fully away from the trip spring.

b. Repeatedly adjust the low trip bolt and decrease pressure through the low set

point until the low trip occurs consistently at the low set point. Tighten the lock
nut and recheck. Check that there is at least 0.02 inch piston travel from low trip to
bottom stop.

NOTE:

When adjusting the low trip bolt, the upper arm of the trip spring must be pushed down.
This unloads the bolt and allows it to be turned by hand.

c. Repeatedly adjust the high trip bolt and increase pressure through the high set

point until the high trip occurs consistently at the high set point. Tighten the lock
nut and recheck.

Pressurematic Set Point Adjustment

11

Section 3: Pressurematic Set Point Adjustment

January 2018

3.2 Cases with low set point only

a. Set high trip bolt fully away from the trip spring.

b. Adjust the low set point as described in 3.1-b above.

c. To disable high trip, increase pressure until piston is at upper stop. Adjust high trip

bolt downward until high trip occurs then retract 1/2 turn. Check that high trip
does not occur when piston travels to upper stop. This high trip bolt adjustment is
to prevent the trip spring from placing unnecessary force on the spool.

3.3 Cases with high set point only

a. To disable low trip, adjust low trip bolt until low trip occurs when piston is within

0.020 inch of bottom stop. Then adjust 3 turns upward (ccw viewed from above).
Tighten locknut and check that low trip does not occur when piston travels to
bottom stop.

b. Adjust the high set point as described in Section 3.1 letter c.

Service Manual

I-220 Rev. 4

12

Pressurematic Set Point Adjustment

Servive Manual

I-0220 Rev. 4

Section 4: Range Screw Adjustment

Section 4: Range Screw Adjustment

This procedure describes the method of changing the range/span from the factory set

range/span of the Hi Lo Pressurematic Pilot.

TOOLS:

• Range screw adjusting tool

• Trip spring retainer

• 2 SAE wrenches/spanners -- 1/2” and 9/16”

• hex key -- 3/16” short modied

• SAE wrench/spanner -- 1-1/4”

NOTE:

To make a change in the operating range/span values the trip spring (14) must be removed
from the housing.

January 2018

4.1 Procedure

1. To prevent VALVE OPERATOR travel, DISARM and DEPRESSURIZE the system or
place selector in MANUAL MODE.

2. Depressurize "SENSE/PROCESS LINE(S)" to the pilot.

3. Remove the four cover bolts (20) and cover (21).

4. Install trip spring retainer onto the trip spring (14) near the LP adjusting bolt (15).
This is done by hooking one end of the trip spring retainer under the bottom
arm of the trip spring and prying down on the top arm to close the trip spring,
then sliding the other end of the trip spring retainer over it. The spring can be
compressed by hand if this retainer tool is not available. Refer to drawing I-0221.

5. Remove trip spring jam nut (12) and upper washer (23). Insert the 3/16 hex key in
the top of the piston to lock it while loosening the jam nut.

6. It may be necessary to engage the HIGH TRIP BOLT (16) all the way up into the
HOUSING (17) before the trip spring can be removed.

7. Remove the trip spring assembly by holding the trip spring retainer compressed by
hand or by using the trip spring retainer as described in step 4 above.

NOTE:

Take care not to bend the upper pilot spool (33) during trip spring (14) removal and
replacement.

Range Screw Adjustment

13

Section 4: Range Screw Adjustment

January 2018

8. Remove trip spring lower washer (23) from the top of the piston (3).

9. Install range screw adjusting tool in range screw (11).

10. With use of 1-1/4 wrench/spanner turn the range screw clockwise to increase/raise
the range value or counterclockwise to decrease/lower range value.

NOTE:

If changing range spring (8) then remove range screw (11). Removal of old spring is done
by means of a small wire hook to pull up on the spring. Install new spring and range screw.
With use of the adjusting, tool adjust range screw one turn beyond hand tight. Proceed to

the following range verication section.

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I-220 Rev. 4

14

Range Screw Adjustment

Servive Manual

I-0220 Rev. 4

Section 4: Range Screw Adjustment

January 2018

Range Screw Adjustment

15

Section 5: Range Verification Procedure

January 2018

Section 5: Range Verication Procedure

Refer to calibration drawing APB0579.

NOTE:

Total piston travel range is approximately 0.250 to 0.300 inches.

1. Connect a complete block and bleed valve test assembly with a gauge of suitable
range to the sense/process port at the bottom of the pilot body (1).

2. Place a ruler or piece of paper behind the piston (3) to help observe the travel.
Mark paper or note measurement at O psi.

3. Slowly increase the test pressure to the pilot body while observing the piston
for signs of movement and watching gauge pressure. When upward movement
begins, note gauge pressure reading to determine lower range limit.

4. Continue increasing pressure until piston travel ends, note gauge reading.
This step determines the upper range limit.

5. Adjust the range screw as necessary to obtain an operating range/span with nal
gauge values outside the setpoints by 100 psi (700 kPA).

Service Manual

I-220 Rev. 4

NOTE:

If unable to obtain required range/span value, consult spring chart on the Range Table
APB0579. If a more accurate range setting is required, a dial gauge will be needed to obtain
a more precise reading of travel.

16

Range Verification Procedure

Servive Manual

I-0220 Rev. 4

Section 6: Reassembly

1. Re-install trip spring assembly (14) onto the piston with a washer on each side of
the trip spring.

2. Install jam nut on piston. Use 3/16 hex key to hold the piston stationary while
tightening the jam nut.

3. Pry down on trip spring upper arm to allow removal of trip spring retainer.

4. Center trip spring in the housing. Spacing from guides of housing should be the
same on left and right.

5. Go to Section I.6. for set point adjustment.

Section 6: Reassembly

January 2018

Reassembly

17

Section 7: Modifying Pressurematic Assembly Type

January 2018

Service Manual

I-220 Rev. 4

Section 7: Modifying Pressurematic Assembly Type

Refer to drawings APB0570 and CB0066-10.

NOTE:

To prevent VALVE OPERATOR travel, DISARM and DEPRESSURIZE the system or place
selector in MANUAL MODE. Depressurize “Sense/Process Line(s)” to the pilot.

7.1 Changing from P-AR to P-MR

The conversion from the automatic reset to manual reset requires complete replacement
of the three pilot body components. They must be machined to accept the manual reset
manifold assembly. Contact BETTIS for more information.

7.2 Changing from P-MR to P-AR

To change from manual reset to automatic reset, disconnect all tubing. Remove the bolts
(103) from the reset valve body (101) and then remove the bolts (44) from the reset valve
manifold (43). Reconnect all tubing to the ports on the remaining pilot bodies.

18

Modifying Pressurematic Assembly Type

Servive Manual

I-0220 Rev. 4

Section 7: Modifying Pressurematic Assembly Type

January 2018

Modifying Pressurematic Assembly Type

19

Section 7: Modifying Pressurematic Assembly Type

January 2018

Service Manual

I-220 Rev. 4

20

Modifying Pressurematic Assembly Type

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