cashco 987 Kurulum, Kullanım ve Bakım Kılavuzu - Sayfa 2

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III. INSTALLATION

A. Orientation:

For welded installations, all internal trim parts and

seals

must be removed from body prior to welding

into pipeline. The heat of fusion welding will dam age

non-metallic parts if not re moved.

not apply to units equipped with extended pipe nip ples.

1. Recommended orientation when installed in

a hor i zon tal pipeline is with the stem vertical.

Valves may also be installed in vertical

pipe lines with stems horizontal.

2. Outdoors, all installations may be oriented

any angle from horizontal-to-vertical.

3. Valves are not recommended for in stal la tion

with the actuator oriented down wards.

Drain

Figure 1: Typical Control Valve Station

B. Piping System:

1. It is recommended that the control valve unit

be installed with a double-block and bypass

as indicated in Figure 1. This arrangement is

recommended especially where main te nance

will be done on the valve body while still

installed in the pipeline.

2. Pipe unions are recommended for NPT

screwed in stal la tions to allow complete

re mov al from system.

3. If pipe reducers are located before and/or after

the valve body, keep the reducers as close as

CAUTION

NOTE: This does

Drain

SECTION III

practical to the valve body; this is especially

important where the reducers are more than

one line size larger than the valve body size,

which is common in gaseous ser vice.

4. For flangeless installation, body (1) must be

machined with serrations on each end of body.

DO NOT attempt to install a body machined for NPT end

connections as a flangeless in stal la tion. Fail ure to heed

could cause fluid leak age.

Model 987 bodies with flangeless end

connections may be installed as below:

PIPING FLANG ES & FLANGELESS

Basic Flange

Size

1/2"

3/4"

1" x 1/2" Reducing

1" x 3/4" Reducing

√ Available

5. Opt-32 Extended Pipe Nipples should be used

for socket welding or butt welding. Standard

end preparation is for socket welding. If butt

weld ing is desired, weld end preparations must

be done in field with suitable tools.

6. Clean the piping of all foreign debris, including

chips, weld scale, weld spatter, oil, grease,

sand or dirt prior to installing the control valve.

This is an absolute re quire ment for valves

supplied with composition soft seats. System

start-up strainers, for removal shortly after

initial start-up, are recommended.

7. Field hydrostatic testing the completed piping

system to 1-1/2 x CWP in psig indicated on the

nameplate, including the 987, is acceptable.

If hydro test pressure exceeds the 1-1/2 x

CWP limit, the 987 must be removed for such

testing. Before pressurization, the valve plug

should be lifted from the seat if of ATO-FC

action. Tighten packing as required.

8. In placing thread sealant on pipe ends prior

to en gage ment, ensure that excess material

is removed and not allowed to enter the valve

upon start-up.

WARNING

TABLE 1

VALVE CONNECTIONS

Flange Pressure Class

150#

300#

N/A

√

600#

N/A

√

IOM-987