Stafsjö WB14E Maintenance Instruction Download Page 10

Document 

Document id 

Issue  Date 

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. 

 

 

 

Summary of Contents for WB14E

Page 1: ...tion Document id mi WB14E EN Issue 1 Date 2021 04 14 WB14E maintenance and field conversion instruction Disassembling of valve parts Changing box packing guiding pads seat and gate Installation of han...

Page 2: ...Advice Has to be respected Information Information useful to follow If these notes and warnings are not respected by the user dangerous situations may occur and may invalidate the warranty of the man...

Page 3: ...Washer 2 Yoke 8c Nut 2a Bearing 9 Box packing 2b Slide washer 9a Box scraper 2c Bearing 9b Box top scraper 3 Stem 10 Valve body 4 Stem nut 10g Valve body boltings 4a Washer 13 Seat 4b Bolt 13b Pin sho...

Page 4: ...Up to DN 300 12 a Remove stuffing box braids and its scrapers 9 9a 9b b Remove the gate and internal guiding pads Go to point 8 7 DN 350 14 up to DN 600 24 a Unscrew valve body boltings and remove on...

Page 5: ...ut equally at both sides on top of the valve body 4 Apply grease Multipurpose Grease OKS 1110 or similar grease approved for EPDM Nitril and FEPM on the gate edges to decrease friction against the sea...

Page 6: ...he one with the seat installed a Make sure that the seat profile pins are inserted correctly in each valve body halves b Insert three body bolts two in the top and one in the bottom tighten them gentl...

Page 7: ...gate with screws 4a and washers 4b Note Do not tighten fully to finally adjust it when the yoke 2 has been assembled 2 Lubricate the thread on the stem 3 with grease Q8 Ruysdael or equal Assemble and...

Page 8: ...vides sufficient space lightning visibility for installation After assembling the actuator should be freely accessible If a fault or problem is detected the knife gate valve must be disconnected and m...

Page 9: ...ded holes according to ISO 228 1 Cylinder size Connection Compressed air supply SC100 SC160 G Min 8 mm SC200 SC320 G Min 15 mm This inner dimension must be larger in case of long air feed lines Suitab...

Page 10: ...nce 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...

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