Dresser Masoneilan 173 Series 매뉴얼 - 페이지 6

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3.2 Installation

3.2.1 173 Series regulators must be installed with the actuator

(2) facing upwards and the diaphragm perfectly horizontal, as

shown in Fig.6.

In pressure reducing applications regulating very low down-

stream pressures (normally lower than 100 mm water column);

the regulator must be installed with the actuator facing down-

wards and perfectly horizontal (below pipeline) as indicated by

the nameplate orientation as shown in Fig. 7.

3.2.2 Before installation, ensure piping is clean, free of any

debris (machining chips, weld slag, etc). Contaminants

remaining in the piping system can damage internal compo-

nents of the regulator.

Fig.6

This pipe shall be linked to

ATEX form (Gr. II Cat. 2)

only in case of non high-

explosive atmosphere

1) Adjustment screw (spring holder)

2) Actuator

3) Pressure gauge

4) Regulator body

5) Drain hole

Fig.7

3.2.3 WARNING/CAUTION ON ATEX USAGE: When handling/

working on harmless fluids (e.g. inert gases, like nitrogen,

carbon dioxide and noble gases) the spring cover is not normally

airtight (ATEX construction, Group II- Cat.2), and has a hole

(5) in Fig.6 and 7 which prevents it from pressurizing if the

diaphragm breaks. If the spring cover is airtight (Fig.4), made

from carbon steel and stainless steel, the hole (5) in Fig.6 and

7 is always threaded ¼"NPT and must be connected to pipe

conveying the discharge to a suitable place (safely and

constantly at atmospheric pressure).

Instructions

EY0173 – 10/08

173 Series

Self-Operating Pressure Regulators

3.2.4 Please bear in mind that the regulated pressure sens-

ing port is located inside the regulator, therefore the pressure

drops in the inter-connecting piping between the regulator and

the point of use will affect the accuracy of the maintained set

pressure. This pressure drop must be considered when calcu-

lating the size of the connection piping.

3.2.5 When it is essential to avoid pressure variations at the

point of use, the regulators are fitted with an external sensing

line connection, as shown in Fig 8. The 1/8" female threaded

port must be connected to a nipple as near as possible to the

point of use.

Fig.8

External sensing line (only on request)

3.3 Start-Up and Calibration

3.3.1 The 173 series pressure regulators are shipped with a

pressure setting at the low end of the adjustable range unless

otherwise specified by the customer. The pressure setting

can be changed to any value within the adjustable range by

loosening the adjusting screw locknut (14) and turning the

adjusting screw (13) clockwise to increase the pressure set-

ting or counterclockwise to decrease the pressure setting.

During regulator start-up or operation, do not touch any part

of the regulator as this can conduct heat if the fluid used is at

a high temperature.