| General: |
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All automation hardware is designed and documented by trained and experienced designers using SolidWorks. |
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All linkage kits will be assigned a permanent kit number and descriptive title for the ease of future re-ordering and to assure consistency from lot to lot. |
Linkage Kit Assembly: |
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A. |
Design |
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1. |
No special tools or modification to any component will be required on assembly. |
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2. |
Kit will allow access for routine valve servicing such as: Gland adjustment, plug lubrication, leak testing, etc., (May not be applicable on direct mount linkages). |
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3. |
Actuator and/or linkage kit must be capable of being removed while the valve is in service. No valve or component containing pressure shall be used to mount the linkage. |
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4. |
Detailed explanation of bracket and coupling design are listed below. |
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B. |
Packing |
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1. |
All kits will be individually packed with the kit number and description highly visible on front of box. |
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2. |
All fasteners required to mount all of the components will be in a sealed plastic bag. |
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3. |
Brackets will be wrapped to prevent scratching or ruining the appearance. |
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4. |
Coupling will be either wrapped or bagged to prevent damage to the machined surfaces. |
Bracket: |
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A. |
Bracket Design |
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1. |
Brackets will typically be 1 piece formed or 1 piece jig welded (from 2 or 3 pcs.). |
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2. |
Rectangular or square tubing brackets are not acceptable unless otherwise authorized by engineering. |
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3. |
Bracket design and tolerance shall ensure suitable stem/shaft alignment and squareness without special skills or tooling during assembly. |
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4. |
Bracket surface where the actuator mounts shall be perpendicular within 0.030" of vertical centerline of the valve. |
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5. |
Bracket assembly shall not permanently deform under torque of twice the highest output torque actuator capable of mounting to the bracket. |
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6. |
The assembly shall support 200lb load at the end of the longest actuator capable of mounting to the bracket with out permanent damage to the bracket. |
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7. |
Bracket shall allow access to valve flange bolts/nuts. |
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8. |
Fastener holes for 3/8" bolts and smaller will be 1/32" larger than the bolt size. Fastener holes for 7/16" bolts and larger will be 1/16" larger than the bolt size. |
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9. |
Bracket must allow for easy access to tighten fasteners based on standard wrench clearances for open-ended wrenches. |
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10. |
Valve clearance holes must be large enough to allow the bracket to be put on without interfering with the packing gland. |
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11. |
Bracket height must allow for easy observation of the position indicator on the side of the coupling. |
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B. |
Bracket Material |
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1. |
Carbon Steel brackets utilize A-36 hot rolled carbon steel unless otherwise specified. |
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2. |
Stainless steel brackets utilize Type 304 stainless steel unless otherwise specified. |
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C. |
Bracket Finish |
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1. |
All brackets will be vibratory deburred to remove all burrs, slag, and scale prior to coating. |
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2. |
All carbon steel brackets will receive Burke Industrial Coatings Supercoat 316L liquid stainless steel paint, unless otherwise noted. Burke paint Number is BW54. |
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3. |
All Stainless steel brackets are vibratory deburred and then glass bead blasted for a uniform and attractive appearance. |
Coupling: |
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A. |
Coupling Design |
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1. |
Couplings must incorporate sufficient end play to allow valve stem to fully extend in the event of a fire, where applicable. |
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2. |
Couplings cannot become disengaged or under engaged regardless of orientation of valve/actuator, i.e., upside down, or horizontal. |
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3. |
Couplings must have minimal backlash (+/-1.0 degrees max.) from actuator driver to valve stem, control valve linkages require zero backlash. |
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4. |
Couplings will be closed milled. Slotted couplings are not acceptable unless approved by engineering. |
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5. |
Couplings must be able to rotate through complete valve cycle without contacting the bracket. |
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6. |
Coupling shall not interfere with valve packing adjustment. |
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7. |
Unless otherwise specified, couplings will have a position indicator. |
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B. |
Coupling Material |
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1. |
Carbon Steel couplings with an O.D. of 1/25" or smaller will be constructed from Type 1144 cold drawn steel. |
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2. |
Carbon steel couplings will receive Burke Industrial Coatings Supercoat 316L liquid stainless steel paint, unless otherwise noted. Burke Paint number is BW 54. |
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3. |
Stainless steel couplings are glass bead blasted for the same uniform appearance as the brackets. |
Miscellaneous: |
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1. |
All fasteners shall have sufficient engagement, material grade with appropriate markings showing so that no yield is possible under maximum rotational and side load. |
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2. |
Hex head cap screws are preferred to mount linkage kit to valve/actuator. |
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3. |
All fasteners will have a lock washer where applicable |
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