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Maintenance instruction
mi-WB14E-HW-SC-EN 1
2021-04-14
10 (10)
6
Assemble the locking nut (28) onto the threaded piston rod (25). Do not
tighten the locking nut fully if stroke length has to be adjusted.
7
Assemble the gate clevis (17) on the threaded piston rod (25).
8
Assemble the cylinder (18) onto the beams (7) and tie rods (5).
9
Center the cylinder (18) and press the beams (7) together and tighten the
tie rod nuts (8c) manually, evenly and crosswise all-around. Use washers
below the nut. Do not tighten fully!
10
Connect the air supply to the cylinder and move the piston rod (25) towards
the gate (6) by gently operating the cylinder. Make sure that the hole in the
gate clevis (17) will interface with the hole in the gate and with the hole in
the beams (7) to enable installation of the clevis pin (20).
11
Connect the clevis (17) with the gate (6) using the clevis pin (20) and secure it with the split pins
(21).
12
Finnish tightening of the tie rod nuts on the valve-cylinder interface evenly and crosswise while
holding the beams together.
13
Open the valve completely by gently operating the pneumatic cylinder (18). In full open position the
clevis pin should be in the center of upper limit switch hole. If the valve has lockouts in open/closed
position, ensure beam lockout holes and gate lockout holes are also aligned. If all are aligned and
centered, continue to step 15.
14
If the clevis pin or the gate lockout holes are not centered in the upper beam holes, measure
distance to have them centered. Demount the split pins (21) and clevis pin (20), then gently open
the cylinder far enough to adjust locking nut and gate clevis. Disconnect the air supply. Adjust the
gate clevis (17) and locking nut (28) to correct position. Ensure you are not turning the piston rod,
only gate clevis and locking nut. Re-do step 10-11 and 13.
15
Lock the gate clevis (17) with the locking nut (28). For extra reliable locking, apply Loxeal thread
adhesive type 55-03 or similar on the gate clevis top before tightening the locking nut.
16
Install gate indicator (65) if needed and gate guards (16) and the black protective caps (7a) in the
beam holes if not limit switches are used.
17
Make a full function test of the knife gate valve.
18
Ensure installation and service instruction for valve, actuator and accessories are followed and the
unit have passed all tests.
19
Operate the valve a few times before the system is pressurized. Leave the valve in desired (open or
closed) position.
•
A valve with double-acting pneumatic cylinder requires a continuous supply of
compressed air to ensure reliable and steady operation.
•
The cylinder should be regularly checked visually for tightness or damage to ensure
that the external conditions do not poses any risk for the operating personnel, cylinder,
valve or its accessories.
•
Inspect the valves on regular basis for any leakages. Seat and box packing are wear
parts that have to be replaced regularly. The interval for both inspection and
replacement depends on the application and operating data such as pressure,
temperature, erosion, chemical, mechanical effect of the media on the materials in the
knife gate valve and on how often the valve is operated.