Yokogawa EJX430B User Manual

Page 26

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<5. Installing Impulse Piping>

5-2

IM 01C27B01-01EN

Pipe-Mounting Type 3-Valve Manifold

(Figure 5.2)

1) Screw nipples into the connection ports on the

transmitter side of the 3-valve manifold, and

into the impulse piping connecting ports on

the process connectors. (To maintain proper

sealing, wind sealing tape around the nipple

threads.)

2) Mount the 3-valve manifold on the 50 mm (2-

inch) pipe by fastening a U-bolt to its mounting

bracket. Tighten the U-bolt nuts only lightly at

this time.

3) Install the pipe assemblies between the 3-valve

manifold and the process connectors and lightly

tighten the ball head lock nuts. (The ball-shaped

ends of the pipes must be handled carefully,

since they will not seal properly if the ball

surface is scratched or otherwise damaged.)

4) Now tighten the nuts and bolts securely in the

following sequence:

Process connector bolts → transmitter-end ball

head lock nuts → 3-valve manifold ball head

lock nuts → 3-valve manifold mounting bracket

U-bolt nuts

F0502.ai

Nipple

Nipple
Process

connector

Ball head

lock nut

Pipe assembly

Ball head

lock nut

Process

connector

bolts

50 mm (2-inch) pipe

Pipe assembly

3-valve

manifold

Impulse

piping

Vent plug

(optional)

Stop valve

(low pressure side)

Equalizing valve

(balancing)

Stop valve

(high pressure

side)

Figure 5.2

3-Valve Manifold (Pipe-Mounting Type)

Direct-Mounting Type 3-Valve Manifold

(Figure 5.3)

1) Mount the 3-valve manifold on the transmitter.

(When mounting, use the two gaskets and the

four bolts provided with the 3-valve manifold.

Tighten the bolts evenly.)

2) Mount the process connectors and gaskets

on the top of the 3-valve manifold (the side on

which the impulse piping will be connected).

Bolts

Process

connector

Gasket

Gasket

Process

connector

Bolts

Stop valve

(low pressure side)

Stop valve

(low pressure side)

3-valve

manifold

3-valve

manifold

Equalizing valve

Equalizing

valve

Stop valve

(high pressure side)

Impulse

piping

Impulse

piping

Stop valve

(high pressure side)

F0503.ai

(high

pressure side)

Figure 5.3

3-Valve Manifold (Direct-Mounting

Type)

NOTE

After completing the connection of the transmitter

and 3-valve manifold, be sure to CLOSE the low

pressure and high pressure stop valves, OPEN

the equalizing valve, and leave the manifold with

the equalizing valve OPEN.

You must do this in order to avoid overloading

the transmitter from either the high or the low

pressure side when beginning operation.

This instruction must also be followed as part of

the startup procedure (chapter 7.)

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