Jordan-valve Mark 627 Series - Gas Service Regulator User Manual download pdf (Page 3)

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Diaphragm and Spring

Remove the diaphragm head cap screw (33), 1.

spring seat (23), diaphragm head (22) and separate

the diaphragm (21) from the post and pin assembly

(19).

After examination and / or replacement, reas-2.

semble by installing diaphragm on post and pin

assembly and reinstalling diaphragm head, spring

seat and cap screw.

Hook the post and pin assembly onto the lever, 3.

rotating the diaphragm assembly until holes match

up with threaded holes in diaphragm case.

Unhook the post and pin assembly from the lever 4.

and torque the diaphragm head cap screw to 7 ft-

lbs (9 N•m).

Re-hook the post and pin assembly to the lever and 5.

re-check diaphragm hole alignment, loosening and

adjusting as necessary, making sure to re-torque

the diaphragm head cap screw appropriately each

time.

Once proper hole alignment is achieved re-hook 6.

the post and pin assembly to the lever.

Apply lubricant to upper spring seat and install with 7.

the Spring.

Install the upper housing such that the screened 8.

vent assembly is in the preferred orientation.

Install the upper housing cap screws through the 9.

upper housing and diaphragm and screw into the

threaded holes in the diaphragm case nger tight.

Install the adjustment screw into the upper housing, 10.

putting slack into the diaphragm.

Finish tightening the upper housing cap screws, 11.

using a crisscross method, and tightening each to

7 ft.-lbs (9 N•m).

Re-adjust the regulator per the instructions on page 12.

one under Startup Operation.

Mark 627 Regulator Tips

Overpressure protection must always be installed 1.

to protect against overpressure of regulator, as

well as overpressure of downstream equipment in

the event of a regulator failure. Also, downstream

pressure that is substantially higher than the pres-

sure setting may result in damage to the regulator

components.

When sizing regulator you should utilize the small-2.

est orice necessary to accommodate the desired

ow/pressure requirement. Pipe size should pref-

erably be 1”, but no smaller than ¾”.

When picking spring range, if two available spring 3.

ranges will accommodate the preferred pressure

setting, utilize the lower range spring, as it will allow

ner adjustment of the setting.

ADJUSTING SET POINT: Prior to adjustment the 4.

regulator should be owing 5% or higher of the

normal operating ow.

Vent should be oriented such that it is protected 5.

from water and other material which might collect

in the Upper Housing.

It is not uncommon that a small amount of gas may 6.

migrate through the diaphragm material. Proper

venting should be installed to avoid dangerous gas

build up.

Downstream pressure will change to some degree 7.

if upstream pressure changes.

FREEZING: Freezing is a common issue where the 8.

ow of pressurized gas is concerned due to normal

refrigerative effects. It is expected that the user will

realize approximately 1°F in temperature drop for

each 15 psi of differential across the regulator. This

may be particularly problematic during cold weath-

er, when temperatures drop below 45°F (7°C). It is

important that the system be designed to alleviate

this problem by utilizing one or more methods such

as:

Multiple regulated pressure drops

Application of heat to the gas

Removal of water from the gas

Utilizing antifreeze solutions in the ow

Failure to consider the temperature-drop aspect

may result in ice plugging of the orice or erratic

performance due to ice formation on other compo-

nents within the regulator.

Noise can be generated in regulators with large 9.

pressure drops and high ow volumes, resulting in

premature wear of regulator components.

Regulators inability to maintain published ow rate 10.

may be as a result of inefcient piping on both the

upstream and downstream side of the regulator.

Upstream pressure should be checked at body

inlet.

Table 1

Maximum Spring & Diaphragm Housing Pressure

Maximum pressure to avoid leakage to

atmosphere or possible damage to internal

parts.

250 psi

Maximum pressure to prevent burst or

possible damage to internal parts.

375 psi

Maximum diaphragm housing over-pressure

(above set-point) to avoid damage to internal

parts.

60 psi

Table 2 - Wide-Open Flow Coefcients

Orice Size C

3/32” 6.9 0.24 28.5

1/8” 12.5 0.43 29.4

3/16” 29 0.93 31.2

1/4” 50 1.71 29.3

3/8” 108 3.42 31.6

1/2” 190 5.29 35.9

1 2 3 4

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Jordan-valve Mark 627 Series - Gas Service Regulator User Manual Page 3

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