Nor-Cal Linear Gate Valve User Manual

Gate Valve

Maintenance

& Adjustment

Procedures

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Nor-Cal Products, Inc., 1967 South Oregon St., Yreka, CA 96097 • Toll Free 800-824-4166 or 530-842-4457 • www.n-c.com Rev. 1-2013

Table of Contents

I. GATE AND BONNET O-RING 1.5” - 21” GATE VALVES ................................................................................3

II. BELLOWS, PNEUMATIC STANDARD 1.5” - 21” GATE VALVES ...................................................................5

III. ACTUATOR O-RING 1.5” - 21” GATE VALVES .............................................................................................8

IV. SEAL PLATE ASSEMBLY/ PINS BEARING 1.5” - 21” GATE VALVES ..........................................................10

Vl. VALVE ADJUSTMENT 1.5” - 21” GATE VALVES .........................................................................................14

VlI. VALVE ADJUSTMENT CHART 1.5” - 21” GATE VALVES ............................................................................15

Figures, Tables and Drawings

Figure 1 BONNET ACTUATOR CARRIAGE ASSEMBLY. SEPARATED FROM VALVE BODY ........................................ 3

Figure 2 GATE O-RING AND BONNET PLATE O-RING .............................................................................................. 4

Figure 3 BELLOWS AND PISTON SHOWN WITH ACTUATOR HOUSING REMOVED .................................................5

Figure 4 PISTON CLOSE-UP FOR SPANNER WRENCH POSITIONING ......................................................................5

Figure 5 BELLOWS AND ACTUATOR ASSEMBLIES DRAWING .................................................................................7

Figure 6 DRIVE SHAFT O-RING .................................................................................................................................8

Figure 7 ACTUATOR O-RING .....................................................................................................................................9

Figure 8 LINKAGE REMOVAL ..................................................................................................................................10

Figure 9 PIN AND LINKAGE CLOSE-UP ...................................................................................................................11

Figure 10 GATE AND STRONG-BACK ASSEMBLIES OPENED ...................................................................................11

Figure 11 PIN, WASHERS AND R-RING REMOVAL DRAWING .................................................................................12

Figure 12 GATE AND STRONGBACK ASSEMBLIES AFTER REASSEMBLY ................................................................13

Figure 13 STRONGBACK AND GATE ASSEMBLIES DRAWING ..................................................................................13

Figure 14 VALVE ADJUSTMENT TABLE .....................................................................................................................15

Figure 15 DIMENSIONS ............................................................................................................................................15

Figure 16 PNEUMATIC ACTUATOR ASSEMBLY .........................................................................................................16

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Nor-Cal Products, Inc., 1967 South Oregon St., Yreka, CA 96097 • Toll Free 800-824-4166 or 530-842-4457 • www.n-c.com Rev. 1-2013

I. Viton Gate & Bonnet O-ring

STD AND MSB 1.5” - 21” GATE VALVES

A. Tools and Materials Required:

1. Allen Wrench for 1.5”—14” Gate Valves

2. 1/2” Box Wrench for 16”—21” Gate Valves

3. O-Ring Pick

4. Rubber Gloves

5. Grease – Apezion L O-Ring Type

6. IPA

B. Procedure: Always wear Rubber Gloves when handling the Gate Valve

1. Vent station and pump corresponding to Gate Valve to atmosphere.

2. Actuate valve to Gate Open position.

3. For safety, remove air to actuator.

4. Remove bolts that hold Bonnet Actuator Assembly to body,
or for Quick-Clamp Bonnet, undo the clamp.

5. Pull out the Bonnet Actuator Carriage Assembly,
taking care not to move adjustment of linkage.

(Continued Next Page)

VALVE BODY

GATE ASSEMBLY &
STRONGBACK

LOWER AND UPPER LINKAGE

BONNET PLATE ASSEMBLY

ACTUATOR ASSEMBLY

ACTUATOR TOP WITH SENSORS
(OPENCLOSED)

Figure 1 - BONNET ACTUATOR CARRIAGE ASSEMBLY
SEPARATED FROM VALVE BODY

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Nor-Cal Products, Inc., 1967 South Oregon St., Yreka, CA 96097 • Toll Free 800-824-4166 or 530-842-4457 • www.n-c.com Rev. 1-2013

6. Remove O-Ring or Gasket from Bonnet Assembly and discard.

7. Remove Gate O-Ring with the plastic pick, taking care not to scratch the O-Ring groove.
Discard the O-Ring.

8. Clean O-Ring groove with IPA and dry out with Nitrogen or CDA.

9. Apply a light coat of Apezion L grease to the new Gate O-Ring. (It is very important

that gloves are worn for this step)

10. Install new O-Ring on gate, taking care to avoid twisting or deforming the O-Ring.

11. Apply a light coat of Apezion L grease to the new Bonnet assembly Viton O-Ring/
Copper Gasket. Install dry.

12. Install new O-Ring/Gasket on Bonnet assembly, taking care to avoid twisting
or deforming the O-Ring.

13. Replace Bonnet Actuator Assembly into valve body.

14. Install bolts and tighten. (For MSB, Copper gasket type, tighten side to side 20-25 ft-lb)

BONNET PLATE O-RING

Figure 2: GATE O-RING AND BONNET PLATE O-RING

GATE ASSEMBLY O-RING

NOTE:

1. BE CAREFUL NOT TO
SCRATCH O-RING
GROOVE

2. APPLY ONLY THIN
LAYER OF GREASE

3. AVOID TWISTING,
STRETCHING OR
DEFORMING THE
O-RING

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Nor-Cal Products, Inc., 1967 South Oregon St., Yreka, CA 96097 • Toll Free 800-824-4166 or 530-842-4457 • www.n-c.com Rev. 1-2013

II. Bellows, Pneumatic Standard Cycle Only

1.5” – 21” GATE VALVES

A. Tools and Materials Required:

1. Spanner Wrench

2. Allen Wrench Set

3. O-Ring Pick

4. Pick (for R-Ring removal)

5. Needle-Nose Pliers

6. Small Standard Screw Driver

7. Actuator O-Rings

8. Grease for Bellows O-Ring: Apezion L

9. Vacuum Grease

10. IPA

11. Heat Gun

12. Lock-Tite

B. Procedure:

1. Vent station and pump corresponding to Gate Valve to atmosphere.

2. Actuate valve to Gate Open position.

3. For safety, remove air to actuator.

4. Remove Actuator Cover. ( 2 screws)

5. Remove Actuator Top. (6 screws)

6. Measure the distance between the top of the Piston and the top of the Drive Shaft.

(This will be helpful later during reassembly and adjustment)

7. Remove the Jam Nut from the Drive Shaft. (Heat gun may be needed to melt the

Lock-Tite on the thread)

(Continued Next Page)

Figure 3: BELLOWS AND PISTON
SHOWN WITH
ACTUATOR HOUSING
REMOVED

BELLOWS

PISTON

DIMENSION “A”

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Nor-Cal Products, Inc., 1967 South Oregon St., Yreka, CA 96097 • Toll Free 800-824-4166 or 530-842-4457 • www.n-c.com Rev. 1-2013