Flowserve 818 Series - Manual (Page 3)

WCAIM2020
818/828 Series 150# and 300# Flanged 2" - 8" Two-Piece Ball Valves
3
Flow Control Division
Worcester Controls
pointing downstream. This arrow is stamped on the body or on a
metal tag welded to the body.
For all valves, lightly lubricate the ball, seats, body seal, stem
seal(s), and thrust bearing, with a lubricant compatible with the
media being handled, except for valves with V20, V33 or V38
options, which are assembled dry. White petroleum jelly is a good
general purpose lubricant. For oxygen-prepared valves (prefix
code “X”), use a PTFE-based lubricant such as Fluorolube S-30 or
equivalent.
2"-8" Two-Piece Valves:
a. Insert new seat in body. Make sure seat rests firmly on back
surface of recess.
b. Reassemble stem assembly by putting new thrust bearing
onto stem and inserting through body cavity into stem hole.
For 3"-8" sizes the thrust bearing can be distinguished from
the stem seals by the darker color of the 25% filled
fluoropolymer used in the thrust bearing. For the 2" size the
stem seals and thrust bearing are the same size and color,
and are interchangeable. Put metal stem washer, new stem
seal(s), and follower onto stem. Fire-rated valves use graphite
stem seal(s), which are metallic silver gray and thicker than
the graphite thrust bearing.
c. Add stop, pointing in correct direction (or round spacer for 8"
size), and stem nut. Using a wrench to prevent the stem from
turning, tighten the stem nut until stem packing is fully
compressed. Then back off
1 /
6
turn. Excessive tightening
causes higher torque and shortens stem seal life.
d. With valve in closed position (stop pointer and/or stem
groove and flats going across pipeline), carefully insert ball
into body so that stem slot engages tang on stem.
e. Install and make sure body seal rests squarely in seal surface
of body. Insert new seat in cavity of end connector.
CAUTION: If the body seal is installed on the end connector,
it will be damaged.
f. Carefully place the end connector into the body using two or
three body studs to align the mid-flange holes. When
correctly located, strike the end connector with a mallet to
push down the end connector further into the body. Tighten
all body nuts to the following torques:
Torque (Ft-Lbs)
Stainless Steel Studs Carbon Steel Studs
Valve Size 818-150# 828-300# 818-150# 828-300#
2" 33 33 34 34
3" 33 82 34 87
4" 57 82 60 87
6" 82 170 87 178
8" 170 214 178 253
g. Replace handle assembly and tighten hex head screw (manual
valves only).
Pressure checking of valve is desirable if practical.
6. When ordering parts, please provide the part name and the
following information as found on the valve nameplate:
a. Valve Size and Style and Revision Number - Examples:
3" - 818 6 66 T 150 - R3 Stem
6" - AF828 4 66 RZ 300 - R3 Ball
OR
b. Valve Size, Style and 5 Character Code, known as a “P”
Number, “T” Number, “C” Number, or similar number, the
designation for a non-standard product.
Example: 6" 828 6 66 T 300 P2577 Ball
The terminology shown in the part listing on the following
page is standard. Please use them when ordering parts.