Flowserve SNA User Manual

Page 1

Automax Valve Automation Systems

3-Position Control/Dribble Control

Installation, Operation and Maintenance Instructions

Flowserve Corporation 1350 N. Mountain Springs Parkway 1978 Foreman Dr. Flow Control Division Springville, Utah 84663-3004 Cookeville, TN 38501 www.flowserve.com Phone: 801 489 2233 Phone: 931 432 4021

SR Limit Switch Method

SuperNova SNA-Series Pneumatic Actuator

All actuators are factory lubricated for life, but still should be protected from the elements and stored indoors until ready for use. The ports of the actuator are plugged as supplied from the factory. If actuators are stored for a long period of time prior to installation, the units should be stroked periodically to prevent the seals from taking a set.

Prior to assembly, check the mounting surfaces, the stem adaptor and the bracket to assure proper fit. Manually open and close the valve to insure freeness of operation. Be sure the valve and actuator rotate in the same direction and are in the same position (i.e., valve open, actuator open). Secure the valve with the stem vertical. Bolt the bracket to the valve and place the stem adaptor on the valve stem. Position the actuator over the valve and lower to engage the stem adaptor to the actuator shaft. Continue to lower until the actuator seats on the bracket mounting surface. In order to align the bolt holes, it may be necessary to turn or stroke the actuator a few degrees and/or adjust the actuators travel stops. Bolt the actuator to the bracket.

After consulting the valve manufacturer's recommendations, adjust the travel stop bolts of the actuator for the proper open and closed valve positions. Pneumatically stroke the actuator several times to assure proper operation with no binding of the stem adaptor. If the actuator is equipped with an UltraSwitch or other accessories, adjust them at this time.

To prolong actuator life use only clean, dry plant air. Lubricated air is not required, however it is recommended particularly for high cycle applications.

Caution: Do not use lubricated air with positioners.

Actuator Socket Size Socket Size Color Code

SNA050 4mm 3mm White SNA063 5mm 4mm Light Green SNA085 6mm 5mm Blue SNA100 6mm 6mm Red SNA115 6mm 6mm Yellow SNA125 8mm 6mm Grey SNA150 8mm 8mm Dark Green SNA175 10mm 8mm Purple SNA200 12mm 8mm Orange

All actuated valves require accurate travel-stop adjustments at both ends of the stroke to obtain optimum performance and valve seat life. The accumulation of tolerances in adapting actuators to valves is such that there must be a range of adjustment for both ends of the strike to achieve the expected performance.

Stop Adjustments and Locations

View the actuator with the Air Ports facing you.

Endcap Screw Adjustment Bolt Spring

Travel Stop Adjustments Both Directions

The SuperNova actuators have unique travel stop

adjustments in both the clockwise and counterclockwise directions.

Actuator Fail Clockwise Counterclockwise Type Position (CW) (CCW)

Double Acting Left End Cap Right End Cap Spring Return CW Left End Cap Right End Cap Spring Return* CCW* Right End Cap Left End Cap

*The pistons are rotated 180° for CCW fail position.

Adjustment Bolt Location

Maintenance Instructions

Disassembly Procedures

1. Disconnect all air and electrical supplies from actuator.

2. Remove all accessories from actuator and dismount actuator from valve.

3. Position actuator with air supply ports facing you. Apply air pressure to Port 2 to release spring pressure from the Stop Bolt (9).

4. Remove the Stop Bolt Retaining Nut (14), Washer (15), and O-ring (16) on the Left Endcap (19) and turn the Stop Bolt (9) clockwise into the Body (1) until it is flush with the endcap (19).

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Automax Valve Automation Systems

3-Position Control/Dribble Control

Installation, Operation and Maintenance Instructions

SR Limit Switch Method

5. Exhaust air from Port 2, the Stop Bolt (9) should now turn freely. Continue turning Stop Bolt (9) clockwise until it it is disengaged from the Endcap.

6. Spring Return Actuator:

CAUTION: Follow step 4 to relieve force on inward

travel stop before proceeding.

To remove Spring Return endcap, first completely remove two diagonal Endcap Screws (21) from one endcap. The two remaining endcap screws should be removed evenly. As the screws are removed, the springs will push the endcap out. Repeat for opposite side. The springs will be totally unloaded before the screws are completely unthreaded. Remove the springs (23,24,25).

Double Acting Actuator: Remove the 8 endcap screws (21).

Step (7) will push the endcaps (18,19) from the body (1).

7. Rotate Pinion (3) counterclockwise (DA & SR-FCW) or clockwise (DR & SR-FCCW) to drive the pistons (2) off the end of the rack. Pull the left piston (2) from the body (1) by pulling on the stop bolt (9).

8. Remove the right piston (2) by pushing out through inside of Body (1).

9. Remove the pinion snap ring (5) and pinion washer (4).

10. Tap pinion (3) lightly with plastic mallet to remove.

Reassembly Procedures

1. Inspect all parts for wear and replace any worn parts as needed. Replace all O-rings.

2. Clean all components and lightly grease cylinder bore, pinion and seals per temperature rating notes (page 4).

3. Reverse the disassembly procedures to reassemble.

4. The standard Pinion (3) orientation is with the drive pocket parallel with the body (1) in the CW position.

5. When fitting the Pistons (2) ensure the teeth engage the Pinion (3) at the same time by measuring in from the edge of the body (1) the same distance from each end. Note: The orientation of the pistons will determine the operation of the actuator. Refer to the diagrams under Operation for correct piston position.

6. Test the actuator for smooth operation and air leakage at service pressure before reinstalling.

Changing Number of Spring

1. Follow the Disassembly Procedures through step 6.

2. Determine nested spring combination of inner, middle and outer springs. Consult catalog torque charts, distributor or factory. Insert appropriate springs into cylinder. Springs must be properly seated against piston and endcap to assure that springs do not bind.

3. Re-assemble the actuator.

Spring chart SNA063-SNA200

Spring Combination ➀

Spring Group #1 Spring #2 Spring #3 Spring

42 51➂ 1➂ 62 71 2 82 2 91➂ 1➂ 2 10 2 2 11 1 2 2 12 2 2 2

Spring chart SNA050 ➁

41➂ 1➂ 52 62 1 71 2 82 2 92 2

➀ #1 Spring has one color code dot

Note #2 Spring has two color code dots #3 Spring has three color code dots

(inner) (middle) (outer)

Spring Combination ➀

#1 Spring #2 Spring #3 Spring

(inner) (low rate outer) (high rate outer)

➁ S50 has maximum of 2 springs per endcap ➂ Install springs on opposite sides

Changing Pinion Orientation

Note: Steps 4&8 are not required for DA actuator.

1. Disconnect all air and electrical supplies from actuator.

2. Remove all accessories from actuator and dismount actuator from valve.

3. Position actuator with air supply ports facing you.

4. Follow step 6 under disassembly procedure to unload spring pressure from right endcap (18) only.

5. Remove the Pinion Snap ring (5) and Pinion Washer (4).

6. Tap Pinion (3) lightly with plastic mallet to remove.

Failure to follow step 4 will result in permanent damage to SR actuator.

7. Reverse steps 5&6 with new pinion (3) orientation.

8. Assembly right endcap (18) in reverse order of disassembly. Grease endcap screw (21) threads with multipurpose “polymer” fortified grease, such as Dubois Chemical MPG-2, before assembly.

Caution:

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Automax Valve Automation Systems

3-Position Control/Dribble Control

Installation, Operation and Maintenance Instructions

SR Limit Switch Method

Operation (as viewed from top of actuator)

Double Acting

Applying air pressure to Port 2 drives the pistons outward, which turns the pinion counterclockwise as the air volume on the outside of the pistons exhausts through Port 1.

Applying air pressure to Port 1 drives the pistons inward, which turns the pinion clockwise as the air volume on the inside of the pistons exhausts through Port 2.

Spring Return (Fail CW)

Applying air pressure to Port 2 drives the pistons outward, which compresses the springs and turns the pinion counterclockwise as the air volume on the outside of the pistons exhausts through Port 1.

Spring Return (Fail CCW)

Applying air pressure to Port 2 drives the pistons outward, which compresses the springs and turns the pinion clockwise as the air volume on the outside of the pistons exhausts through Port 1.

Exhausting the air pressure from Port 2 allows stored energy of the springs to drive pistons inward, turning the pinion clockwise. Air volume on outside of pistons vents through Port 1.

Exhausting the air pressure from Port 2 allows stored energy of the springs to drive pistons inward, turning the pinion counterclockwise. Air volume on the outside of pistons vents through Port 1.

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Automax Valve Automation Systems

3-Position Control/Dribble Control

Installation, Operation and Maintenance Instructions

SR Limit Switch Method

Item

No.

1 Body Hard Anodized Aluminum 1 1 2 Pistons Die Cast Aluminum 2 2 3 Pinion Nickel Plated Steel 1 1 4 Pinion Washer ➀ Nylon 1 1 5 Pinion Snap Ring ➀ Steel/Plated 1 1 6 Upper Pinion O Ring ➀ Nitrile Rubber 1 1 7 Lower Pinion O Ring ➀ Nitrile Rubber 1 1 8 Piston and End Cap O Ring ➀ Nitrile Rubber 4 4

9 Inward Travel Stop Bolt Stainless Steel 1 1 10 Inward Travel Retaining Nut Stainless Steel 1 1 11 Inward Travel Spring Steel/Plated 1 1 12 Piston Guide Nylon and Molybdenum Disulfide 2 2 13 Piston Guide Band Nylon and Molybdenum Disulfide 2 2 14 Stop Bolt Retaining Nut Stainless Steel 2 2 15 Stop Bolt Washer Stainless Steel 2 2 16 Stop Bolt O Ring ➀ Nitrile Rubber 2 2 17 Stop Bolt Stainless Steel 1 1 18 Right End Cap Die Cast Aluminum/Electrostatic Poly 1 1 19 Left End Cap Die Cast Aluminum/Electrostatic Poly 1 1 20 End Cap Supply O Ring Nitrile Rubber 2 2 21 End Cap Screw Stainless Steel 8 8 22 End Cap Screw Washer Stainless Steel 8 8 23 Outer Spring Spring Steel Coated 0 2 max. ➁ 24 Middle Spring Spring Steel Coated 0 2 max. ➁ 25 Inner Spring Spring Steel Coated 0 2 max. ➁

Part Description

Materials

Quantity

DA SR

Note: ➀ Parts included in Seal Kit.

➁ See spring chart for required spring combination.

Seal Kits

Buna Seal Kit Number Viton Seal Kit Number Low Temperature Seal

Kit Number

SN kits consist of all sealing parts, snap ring and washers.

SN (Actuator Model No.) SKB SN (Actuator Model No.) SKV

S (Actuator Model No.) SKF

Pressure Rating

150 psig maximum

Temperature Ratings

Standard ● Nitrile -20°F to +175°F High Temp ▲ Viton 0°F to +300°F Low Temp ▲ Silicon-based -55°F to +175°F

Notes:

● For standard applications use multi-purpose

polymer fortified grease, such as Dubois Chemicals MPG-2.

▲ For low temperature and high temperature

applications, use special formulated grease such as Dow Corning® 55.