GE Masoneilan 48000 Series, Инструкция по эксплуатации

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1st
2nd
1st 2nd 3rd 4th 5th 6th
actuator Type
87 Spring Diaphragm
Air to Close
88 Spring Diaphragm
Air to Open
51 Double acting
Cylinder
52 Spring Cylinder
Air to Close
53 Spring Cylinder
Air to Open
Body
Series
48
Plug Type
3. Unbalanced
5. Balanced with
metal Seal Ring
F low
Characteristics
1. Linear
2. Equal
Percentage
Cage Type
1. Standard
cage
2. Lo-dB*Cage
O ptional
Configuration
EB Extension
Bonnet
1. Introduction
The following instructions should be thoroughly reviewed
and understood prior to installing, operating or performing
maintenance on this equipment. Throughout the text,
safety and/or caution notes will appear and must be strictly
adhered to, otherwise, serious injury or equipment
malfunction could result.
GE has a highly skilled After Sales Department available for
start- up, maintenance and repair of our valves and
component parts.
Arrangements for this service can be made through your
local GE's Masoneilan representative or sales department.
When performing maintenance use only Masoneilan
replacement parts. Parts are obtainable through your local
representative or spare parts department. When ordering
parts, always include model and Serial number of the unit
being repaired.
2. General
These installation and maintenance instructions apply to all
sizes and ratings of the 48000 Series control valves
regardless of the type of trim used.
The 48000 Series control valves are designed especially for
high temperature and nigh pressure steam services where
the cages tend to be deformed due to high heat-cycle
frequency or thermal stress by sudden changes of
temperature.
Note that the 48000 Series would be well suited for vapors
other than steam and gases.
The basic structure of the 48000 Series is of the hung cage
type. The cage is hung and the seat ring is directly fixed to
the valve body by screwing. This allows the cage to be less
affected by heat to prevent leak from the seat ring gasket
caused by heat cycles in the normal retainer structure and
erosion of the gasket resulting from the leak.
A seat ring gasket is inserted between the body and the seat ring for
sealing.
Three types of trims (plugs) are available : Single – seat contoured
(Unbalanced contoured), Unbalanced and Balanced. For the
balanced type plug, double seal ring structure is provided to reduce
valve seat leakage.
3. Unpacking
Care must be exercised when unpacking the valve to prevent
damage to the accessories and component parts. Should
any problems arise, contact your local GE's Masoneilan
representative or sales department.
4. Installation
4.1 Before installing the valve in the line, clean piping and
valve of all foreign material such as welding chips, scale, oil,
grease or dirt. Gasket surfaces should be thoroughly
cleaned to ensure leak-proof joints.
4.2 To allow for in-line inspection, maintenance or removal of
the valve without service interruption, provide a manually
operated stop valve on each side of the 48000 Series valve
with a manually operated throttling valve mounted in the by-
pass line (See Figure 2).
4.3 The valve must be installed so that the controlled
substance will flow through the valve in the direction
indicated by the flow arrow located on the body.
• Lo-dB cage design flow-to-open
• Standard cage design: flow-to-close
4.4 For heat-insulated installation, do not insulate the valve bonnet.
Take necessary protective measures relate to personal safety.
Figure 1 - numbering System