Metso Jamesbury Wafer-Sphere Series, Руководство по эксплуатации

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4 IMO-15
PRECAUTIONS
Safety first! For your safety, take the following precautions
before removing the valve from the line, or before any
disassembly:
1. WHAT'S IN THE LINE?
Be sure you know what fluid is in the line. If there is
any doubt, double-check with the proper supervisor.
2. ARE YOU PROTECTED?
Wear any protective clothing and equipment normally
required to avoid injury from the particular fluid in the
line.
3. IS THE LINE DEPRESSURIZED?
Depressurize the line and drain the system fluid. The
Wafer-Sphere valve’s offset shaft creates greater disc
area on one side of the shaft. This means that a
Wafer-Sphere valve tends to open when pressurized
on the insert side without an actuator on the valve.
Note: DO NOT pressurize the valve without an actua-
tor mounted on it. DO NOT remove an actuator from a
valve under pressure.
4. IS THE VALVE CLOSED?
Before you install a Wafer-Sphere valve in, or remove it
from the line, cycle the valve fully closed. The
Wafer-Sphere valve must be removed from the line in
the closed position or damage to the wafer will result.
INSTALLATION
I. FULL PRESSURE RATING – ELASTOMER-SEATED WAFER-
SPHERE VALVES
In general, for full pressure rating, all elastomer-seated
Wafer-Sphere butterfly valves should be installed with
the disc face toward the higher pressure (shaft down-
stream). Butt weld piping flanges are recommended
for high pressure valves.
II. METAL-SEATED WAFER-SPHERE VALVES
Metal-seated Wafer-Sphere butterfly valves are single-
directional. They must be installed ONLY with the disc
face toward the higher pressure (shaft downstream).
III. GENERAL INFORMATION
1. Read the GENERAL PRECAUTIONS section carefully.
2. IMPORTANT: ONLY actuator stop set screws must
be used to stop the disc in position. DO NOT use
the “positive stop” insert (2) by itself to limit actuator
travel.
3. Visually check the position of the disc when the
Figure 2
Approximate Dimensions (Inches)
Valve Size A B C D E F G K L M P S Shaft Diam.
14 3-1/4 1-15/16 13-3/8 18-3/4 12-1/2 16-1/4 16-3/16 12-7/16 1 – 8 28-1/4 1-1/8 1-5/8
16 3-13-16 2-1/16 18-1/2 21-1/4 14-3/8 18-7/8 18-5/8 14-5/8 1 – 8 20 31-7/8 1-5/8 1-7/8
18 4-5/8 2-5/16 21 22-3/4 16-9/16 21-3/8 19-3/4 15-3/4 1-1/8 – 7 22-1/2 34-3/4 1-5/8 2-1/8
20 4-1/2 2-9/16 23 25 18-5/8 23-3/8 20-3/4 16-3/4 1-1/8 – 7 25 36-3/4 1-5/8 2-3/8