Cashco PBE-H Pressure Build Economizer Manuel d'utilisateur télécharger pdf (Page 2)

IOM-PBE-H

III. PRINCIPLE OF OPERATION

1. Movement occurs as pressure variations regis-

ter on the diaphragm. The registering pressure

is the outlet, P

, or downstream pressure. The

range spring opposes di a phragm movement. As

SECTION III

IV. STARTUP

SECTION IV

De ter mine if the regulator is ﬂ owing. If not, slowly

rotate the regulator adjusting screw clockwise

(CW) until ﬂ ow begins.

6. Continue to slowly open the inlet (upstream) block

valve until fully open.

7. Continue to slowly open the outlet (downstream)

block valve, especially when the downstream pip-

ing system isn't pressurized. If the outlet (down-

stream) pressure exceeds the desired pres sure,

close the block valve and go to Step 2, then return

to Step 4.

8. When ﬂ ow is established steady enough that the

outlet (downstream) block valve is fully open,

be gin to slowly close the bypass valve if installed.

9. Develop system ﬂ ow to a level near its expected

normal rate, and reset the regulator set point by

turning the adjusting screw CW to increase outlet

pressure, or CCW to reduce outlet pressure.

10. Reduce system ﬂ ow to a minimum level and

ob serve set point. Outlet pressure will rise from

the set point of Step 9. The maximum rise in

outlet pressure on decreasing ﬂ ow should not

exceed the stated up per limit of the range spring

by greater than 10%; i.e. 20-80 psig (1.38-5.52

Barg) range spring. (Example: at low ﬂ ow the

outlet pressure should not exceed 88 psig (6.07

barg), if it does, con sult factory).

outlet pressure drops, the range spring pushes

the dia phragm down, opening the port; as outlet

pres sure in creas es, the diaphragm pushes up

and the port opening clos es.

2. A complete diaphragm failure will cause the reg u-

la tor to fail open.

V. SHUTDOWN

1. On systems with a bypass valve, and where sys-

tem pressure is to be main tained as the reg u la tor

is shut down, slowly open the bypass valve while

closing the inlet (up stream) block valve. Fully

close the inlet (up stream) block valve. (When on

bypass, the sys tem pres sure must be con stant ly

observed and man u al ly reg u lat ed. Close the

outlet (down stream) block valve.

2. If the regulator and system are to both be shut

down, slowly close the inlet (upstream) block

valve. Close the outlet (downstream) valve only

if reg u la tor re mov al is required.

SECTION V

CAUTION

The maximum outlet pressure is list ed on the name plate

as the upper range spring pres sure level, and is the rec om -

mend ed "upper operative limit" for the sens ing diaphragm

(See Section IV. Startup, Step 7). Higher press ures could

dam age the di a phragm. (Field hydro static tests fre quent ly

de stroy dia phragms. DO NOT HYDRO STATIC TEST THRU

AN IN STALLED UNIT; ISO LATE FROM TEST.)

CAUTION

Do not walk away and leave a bypassed reg u la tor unat-

tended.

1. Start with the block valves closed. A by pass valve

may be used to maintain out let pres sure in the

down stream sys tem without changing the fol low-

ing steps.

2. Relax the range spring by turning the adjusting

screw counter clockwise (CCW) a minimum of

three (3) full revolutions. This reduces the outlet

(down stream) pres sure set point.

3. If it is a “hot” piping system, and equipped with

a bypass valve, slowly open the bypass valve

to preheat the system piping and to allow slow

ex pan sion of the piping. Closely monitor outlet

(down stream) pres sure via gauge to ensure not

over-pressurizing. NOTE: If no bypass valve is

in stalled, extra caution should be used in starting

up a cold system; i.e. do everything slowly.

4. Crack open the outlet (downstream) block valve.

5. Slowly open the inlet (upstream) block valve ob-

serv ing the outlet (downstream) pressure gauge.

1 2 3 4 5 6 7 8

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Cashco PBE-H Pressure Build Economizer Manuel d'utilisateur Page 2

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