Instruction Manual
D500211X012
A41 Valve
November 2012
6
CAUTION
The valve configuration and construction materials were selected to meet particular pressure, temperature, pressure drop,
and controlled fluid conditions specified in the customer's order. Because some body/trim material combinations are
limited in their pressure drop and temperature range capabilities (especially due to differences in thermal expansion rates),
do not apply any other conditions to the valve without first contacting your Emerson Process Management sales office.
1. Install a three-valve bypass around the control valve assembly if continuous operation is necessary during
inspection and maintenance of the valve.
2. Inspect the valve to be certain that it is free of foreign material.
3. Be certain that adjacent pipelines are free of any foreign material, such as pipe scale or welding slag, that could
damage the valve sealing surfaces.
CAUTION
Damage to the disc will occur if any pipe flanges or piping connected to the valve interfere with the disc rotation path. If the
piping flange has a smaller inner diameter than specified for schedule 80 piping, measure carefully to be certain the disc
rotates without interference before putting the valve into operation.
Valve Orientation
When installing the valve, it is highly recommended that the valve drive shaft be horizontal as shown in figure 4.
Valve Direction
The high performance butterfly valve is designed to allow flow in either direction when in the open position. When in
the closed position, high pressure should be applied to a specific side of the disc to provide best performance and
optimal valve life (see list of seal types below). See figure 4.
Table 5. Special Spiral Wound Gasket Dimensions, Inches
Valve Size, NPS Class Gasket Internal Diameter Gasket Outside Diameter
Centering Outside
Diameter
(1)
3 150 4.25 5.00 5.375
3 300 4.25 5.00 5.875
4 150 5.25 6.125 6.875
4 300 5.25 6.125 7.125
1. Dimension per API 601 and ASME B16.5 Flanges.
Applications with bi-directional seals, such as soft or Phoenix III, under normal operating conditions can (at different
times) experience pressure in both directions; the highest of the two pressures should be exerted on the preferred side
of the disc. If the two pressures are equal, then the one lasting the longest period of time should be applied to the
preferred side.
1. For PTFE, reinforced PTFE, or UHMWPE seal rings: This seal is bidirectional. For best performance, high pressure
should be applied to the front (retaining ring) side of the disc.
2. For metal seal rings:
a. NOVEX seal: The NOVEX seal is uni-directional. High pressure at the closed position MUST be at the back
(waterway side) of the disc.
(184 Seiten)
(128 Seiten)
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