Site Storage Precautions
1. For outside site storage ensure valves or containers are
wrapped in plastic or otherwise protected from ingress of
dust or blowing sand. Do not remove flange covers.
2. Actuated or gear operated valves should be kept dry.
3. Inside warehouse storage requires no special
protections.
Installation
1. Fluid flow may be in either direction and the valve may
be mounted in any position. When the valve terminates
a line, the insert end should be positioned toward the
flow direction (upstream side).
2. Pipe must be properly aligned and provisions made to
minimize stress from thermal expansion. Always
review pipe manufacturer's recommendations.
3. Expanded PTFE or 50 Durometer Rubber Full-Face
gaskets are recommended.
4. Flange Bolts should be evenly tightened, using a
torque wrench, in cross rotation to prevent flange
damage. Refer to the table below for proper flange
bolt torque. We recommend installation in piping
systems with flat-faced flanges.
5. When installing against raised face flanges, spacer
rings should be used to provide a flat surface to the
face of the valve flange.
6. When washers are used under the nuts on flange
studs, AN960 Aeronautics Specification washers
should be used. Optional stainless steel washer kits
meeting this specification are available from Nil-Cor.
7. After valve installation, the packing bolt torque should
be checked to ensure the stem seal. Refer to the table
below for the Packing Bolt Torque.
Disassembly
1. Depressurize the line and valve as follows:
2. Open valve and drain the line.
3. Before removal from the line, cycle (open and close)
the valve to relieve residual pressure in the body
cavity.
4. After removal and before disassembly, cycle (open
and close) the valve several times to clear it of fluid;
then flush with water.
5. Open valve completely and remove handle.
6. Secure body in a clamping device, being careful not to
damage or crush it.
7. Remove gland bolts from the valve body.
8. Use the Insert Removal Tool, sold separately, to
unscrew body insert and remove ball, body insert
gasket, (o-ring) and the two ball seats. Take care not
to damage sealing surfaces in body or gland.
9. Carefully push valve stem down into the valve body
and withdraw it through the open end. Remove the
thrust washer from stem.
Assembly
1. Inspect and clean all parts to make sure they are free
of dust, grit or other material. New O-ring and ball
seats should be used after the valve has been used in
service and is reassembled.
2. A good lubricant compatible with the fluid service,
such as silicone grease, should be applied lightly to
seats, seal, ball, stem, and body insert threads.
3. Assemble thrust washer on stem. Carefully insert
upper end of stem into body of valve and maneuver
into opening in top of valve. Push stem upward until
thrust washer is seated.
4. While holding stem in position with one hand, slip
gland packing into cavity around upper end of stem.
See table at left for correct number of compression
rings and adapter rings. Use the gland to press
packing into place and slightly draw up the packing by
tightening the gland bolts. Assemble valve handle to
stem, insert cap screw and tighten hex nut.
5. Press one ball seat firmly into the valve body seat
cavity. When using self-relieving seats, make sure the
spherical surface of the seat faces the center of the
valve. When using seats with an o-ring backup care
should be taken to be sure that the o-ring does not fall
out or become misaligned inside the valve.
6. Rotate stem so that stem bottom is aligned axially
with the valve and ball can be fully inserted.
7. Place ball in body against seat, with ball in the closed
position. Rotate stem and ball to the open position so
that ball can not fall out.
8. Place second ball seat into the body against the ball,
and the insert O-ring in the body against the back of
the seat.
9. Screw body insert into the valve body until flange
serrations between body and insert are flush with
each other.
