FYA-P Handwheel Operated Diaphragm Valves  in Weir Type Installation/Operation/Maintenance Manual

1.0 INSTALLATION

1.1 In vertical lines, FYA-P diaphragm valves may be installed in any position.

In horizontal lines, where drainability is critical, FYA-P valves should be installed with the drain dot or hash mark, located on the end connection close to the body-bonnet flanged, at 12 o’clock. This angle is unique to each valve size. Contact the factory if a drain dot or hash mark is not present.

In horizontal lines, where drainability is a concern but not critical (typically processes other than pharmaceutical, bioprocessing, food or beverage), the valve should be positiond with the stem at 90 degrees from vertical.

In all lines, the bonnet assembly should be positioned with the weep hole (a small hole in the side of the bonnet used as a diaphragm leak detection port) facing down.

1.2 Prior to pressurization (with the valve open, tighten the bonnet nuts in a crisscross pattern in accordance with Table 1. Re-tightening 2 hours after the system reaches Operating temperature and pressure is recommended. If leakage occurs at the body/diaphragm seating area, immediately depressurize system and tighten bonnet nuts as noted above. If leakage continues, diaphragm replacement is required. See Section 3.4. 2.0 OPERATION AND ADUSTMENT 2.1 STANDARD BONNET (Fig. 3) The standard bonnet with be equipped whither a position  indicating or travel stop type spindle. The valve is closed  with a clockwise rotation  of the handwheel. See Table 2 for stroke length and  number of turns information.

1.0  Remove pressure from the line containing the valve.
2.0  Remove bonnet bolts and nuts. Remove the bonnet and unscrew the diaphragm form the Compressor.
3.0  Replace the bonnet on the valve body (without a diaphragm).
4.0  Replace two bonnet bolts and nuts on opposite sides of the bonnet, hand tight.
5.0  Turn the handhwheel until the compressor touches the weir. The valve with not closes further.
6.0  Remove the bonnet from the valve body. Screw a diaphragm into the compressor hand tight. Than back it off until the bolt holes in the   diaphragm and bonnet flange register.
7.0  Rotate the handhweel counterclockwise just enough to permit flange area of diaphragm to rest flat against flange area of bonnet.
8.0  Replace the bonnet, which now includes the diaphragm, on the valve body. The bonnet should be opened on half to one turn of the  handwheel. Tighten the bonnet nuts in accordance with Section 1.2.

If a test fixture is not available for Weir Valve s with PTFE diaphragms, use the following procedure:

1. Loosen lock nut.
2. Turn handwheel clockwise until the initial resistance of the diaphragm seating is felt. From this point, turn the handhweel another 5/8 turn.
3. Turn the lock nut sown until it bottoms on the spacer.

3.0 MAINTENANCE

3.1 Periodically inspect condition of external valve parts. Replace all parts showing excessive wear or corrosion.
3.2 If body diaphragm seating area leaks, depressurize system and open valve slightly. Tighten bonnet nuts as described in Section 1.2. If leakage continues, diaphragm replacement is required.
3.3  If leakage is occurring around the handwheel, spindle, or through a bonnet weep hole, the diaphragm is ruptured and must be replaced.

3.4 DIAPHRAGM REPLACEMENT FOR WEIR TYPE ( SEE FIG. 3)

1. Remove pressure for line containing valve. Rotate handwheel clockwise to just close valve.
2. Remove bonnet nuts.
3. Lift off bonnet and unscrew diaphragm from compressor by turning counterclockwise.
4. Replacement diaphragm should be identical size and grade as original diaphragm. See Figure 6 for location of size and grade marking. Thread new diaphragm into compressor handtight, and then back off until bolt holes in diaphragm register with bolt holes in bonnet flange.
5. Rotate handwheel counterclockwise just enough to permit flange area of diaphragm to rest flat against flange area of bonnet.
6. Replace valve bonnet on body and tighten bonnet nuts handtight.
7. Close valve fully by rotating handwheel clockwise: then back off one-half to one full turn of handwheel. Tighten bonnet nuts evenly with wrench (see Section 1.2).
8. Open valve and check bonnet nuts to ensure they are evenly tightened.

If diaphragm leaks at body/bonnet joint after reaching temperature and pressure, depressurize system and retighten nuts in accordance with Section 1.2.
  

VALVE DIAPHRAGM INDENTIFICATION ELASTOMER-1 PIECE, MADE OF RUBBER, WITH MOLDED-IN STUD. (SEE TABS)

FIGURE 6

We recommend spare operating and line diaphragms (PTFE faced, natural,
Synthetic rubber), to achieve a long shelf life: are stored in bags on wooden shelves, away
from direct sunlight and ozone (which can be formed by electrical equipment).

Leave diaphragms in FYA-P pack until required.

Do not place other articles on diaphragms to avoid possibility of deformation.

Always handle them with care.