Alfa Laval Air Actuated Valve 771L-21M-20-X-316L

Warning: Ensure the valve stem is not vibrating before proceeding

Nylon Locking Pin located in the middle of the stem thread?

If not, report the issue to the maintenance team and stop the procedure

Old nylon pin punched out with an 1/8 inch or smaller diameter punch?

New nylon locking pin inserted?

Sign off on the actuator stem replacement

Inspect Valve Body Seat(s) for nicks and scratches and other signs of excessive wear

Inspect Valve Stem & Seat(s) rubber or PTFE seat(s) for signs of cracking, tearing, checking, or excessive wear

Inspect stem finish for galling, nicks, or scratches

Inspect Split Bushing for signs of cracks, nicks, scratches or excessive wear on inside diameter

Inspect O-ring(s) for cuts, abrasions, flat spots, or other damage

Upload photos of any damage found

Sign off on the valve inspection

Warning: Disconnect and remove actuator completely from valve before proceeding

Bushing and packing failure check

If one end fails, both ends of the actuator should be serviced

Check for worn or damaged components

Replace all worn or damaged components as required

Spray stem and o- ring with Sanitary Lubricant

Check if all valve bodies are mated properly before securing with clamps

Check if all clamps are tightened securely to assure proper alignment

When disassembling and assembling valve, bench area should be clean to prevent marking and nicking of seats

Warning: This procedure requires trained personnel with PPE!

Oil injected into the unthreaded thru hole in each end of the actuator

Actuator rolled on a flat surface repeatedly to obtain uniform coverage of lubricant

Sign off on the actuator lubrication