Neles Easyflow J7 DN15, Installation Maintenance And Operating Instructions

5

IMO-240 EN - Issue 7/2020

WARNING: 

ALWAYS DISCONNECT THE ACTUATOR FROM ITS POWER 

SOURCE, PNEUMATIC, HYDRAULIC OR ELECTRICAL, 

BEFORE ATTEMPTING TO REMOVE IT FROM THE VALVE! 

WARNING: 

DO NOT REMOVE A SPRING-RETURN ACTUATOR UNLESS 

A STOP-SCREW IS CARRYING THE SPRING FORCE! 

1. 

Detach the air supply, electrical supply, hydraulic supply and 

control signal cables or pipes from their connectors. 

2.  Remove the actuator mounting bracket screws. 
3.  Lift the actuator straight up in line with the valve stem until 

the connection between actuator drive and valve  stem is 

completely disengaged. 

4. 

Place actuator in a safe location to avoid damage or  

personal injury. 

4.3 VALVE DISASSEMBLY 

NOTE:

  It is good practice to replace all seats and seals any time a 

valve is disassembled. 

NOTE:

 Always use original OEM parts to make sure that the valve 

functions properly.
Numbers in ( ) refer to items shown in the exploded view
1.  Follow the steps in all the 

WARNING

 sections above before 

performing any work on the valve.

2.  Open the valve.
3.  Place the valve on a bench or other suitable working space.
4.  Secure tank side flange to working surface to prevent 

movement during disassembly.

5.  Remove body nuts (20).
6. 

Lift end piece (2), body seal (17), body gasket (18), and seat 

(4) from valve.

7.  Close ball (3) by rotating stem (5) and lift ball (3) from body.
8.  Remove lower seat (4) from valve body, being careful not to 

scratch the body sealing surface behind the seat.

9.  Remove gland nuts (16), gland flange (14), disc spring (13), 

stem retainer 2 (10), v-ring stem seal (9), stem retainer 1 

(8), and stem seal (6).  Use caution to prevent denting or 

scratching the sealing surface inside the packing bore.

10.  Push stem (5) into valve body and carefully remove.  Avoid 

denting or scratching the sealing surface on the stem.

11.  Remove bottom stem washer (7) from the body.

4.4 CHECKING PARTS 

1.  Clean all disassembled parts. 
2.  Check the stem (5) and ball (3) for damage. Pay particular 

attention to the sealing areas. 

3. 

Check all sealing and gasket surfaces on the body (1) and  

end piece (2).

4.  Replace any damaged parts. 
5.  Replace any fastener where the threads are damaged or have 

been heated, stretched or corroded.

6.  Replace any parts that have cracks, gouges or pits that will 

affect sealing. 

NOTE:

 When ordering spare parts, always include the following 

information: 

a.    Valve type code as per technical bulletin and model 

number from name plate,

b.     If the valve is serialized - the serial number (stamped 

on the valve body or name plate) or applicable 

manufacturing order number,

c.     Spare part set number as per 

Table 3

.

4.5 VALVE ASSEMBLY 

Numbers in ( ) refer to items shown in the exploded view.

It is advisable to replace seats and seals if complete disassembly 

and reassembly become necessary.
1.  Clean all valve components, if not previously done.
2. 

Inspect all components for damage before assembling the 

valve. Look for damage to the sealing areas on the ball, stem, 

and body.

3. 

With a brush, clean body studs (19) and gland stud (15) 

of foreign material such as paint, thread locker, grime and 

commodity. Inspect the threads for damage or defect with 

appropriate ring or plug gage. Repair any out-of-tolerance 

threads or replace in-kind.

4. 

Re-inspect all components for damage to the sealing areas, stem 

(5), body (1), and end piece (2).  Replace any damaged parts.

5. 

Carefully clean and polish the ball (3) sealing surface: It should 

be free of all scratches and grooves.

6. 

If the ball is slightly damaged, it may be possible to smooth the 

sealing surface with crocus cloth or equivalent.  If deep scratches 

are present, replace the ball.

7. 

With the body cavity facing up, insert one valve seat (4) into 

the body (1) to below the stem bore. Tilt the seat into place and 

position so the proper surface will be in contact with the ball.

8.  Place stem washer (7) over stem (5) and gently press into 

place against shoulder on stem (5).

9. 

Insert the stem (5) into the body (1), being careful not to 

scratch the stem sealing surface; and press it gently up into 

the stem bore until resistance is felt from the stem washer (7).

10. 

Holding stem (5) in place from the bottom, insert stem seal (6), 

stem retainer 1 (8), v-ring stem seal (9), and stem retainer 2 

(12) with both inner and outer o-rings (11) and (12).

11. 

Install disc springs (13) (see 

figure

 for proper orientation), gland 

flange (14), and gland flange nuts (16). 

Figure 3. 

Proper Disc Spring Arrangement (uncompressed)

12. 

Tighten gland nuts (16) evenly until stem seal (9) is 

compressed and then tighten an additional ¼ turn.  Visually 

inspect to ensure gland flange (14) is parallel with top of 

actuator mounting flange.

13.  Rotate the stem (5) so the ball drive is in the closed position.  

Place the ball (3) into the body cavity by partially rotating and 

sliding the ball onto the stem (5) and against the seat (4). 

Make certain the stem is roughly in the middle of the ball slot.

14. 

Place the second seat (4) into the end piece (2) in the correct 

orientation so the proper surface contacts the ball.