Jordan Valve Mark 627 User Manual

I & M Mark 627

3170 Wasson Road • Cincinnati, OH 45209 USA

Phone [phone] • Fax [phone]

[e-mail] • www.jordanvalve.com

Warning: Jordan Valve Pressure Regulators must only be used, installed and repaired in accordance with these In­stallation & Maintenance Instructions. Observe all applicable public and company codes and regulations. In the event
of leakage or other malfunction, call a qualied service person; continued operation may cause system failure or a
general hazard. Before servicing any valve, disconnect, shut off, or bypass all pressurized uid. Before disassembling
a valve, be sure to release all spring tension.

Note: This document is to be used in conjunction with
The Mark 627 Series Cut Sheet.

WARNING! Over-pressure of this regulator or
installation of the regulator in applications which
may see pressure levels beyond those for which
the regulator is designed may result in leakage
and/or catastrophic failure. This failure could
result in leaking gas, damage to surrounding
equipment, personal injury or death. To prevent
such damage / injury the regulator should be in­stalled in a safe location and should be chosen
based upon the user’s specic application.

It is highly recommended that suitable pressure relieving
devices, as recommended by appropriate codes or stan­dards, be installed in your system to assure that maxi­mum rated pressures are not exceeded.

Installation

The Mark 627 should be chosen based upon the 1.
maximum, differential and outlet pressures as
described in Table 1. Flow capacities are listed in
Table 2. The operating temperature range is -20°F
to 180°F. When choosing and installing a regulator
one must ensure that the conditions do not exceed
these parameters. Furthermore, large differentials
in pressure across the regulator may result in the
formation of ice in the orice area. The resulting
decrease in orice area may affect the regulators

Installation & Maintenance Instructions for

Mark 627 High Pressure Regulator

ability to ow in sufcient volume for downstream
demand. Therefore, large pressure drop applica­tions may require the use of more than one regula­tor.
Make sure that line pressure has been eliminated 2.
prior to the installation of any regulator. Prior to
installation the line should be inspected to ensure
that there is no debris that might damage the regu­lator.
The regulator should be installed with the ow ar-3.
row on the side of the body in the correct orienta­tion to ow - i.e. higher pressure upstream, lower
regulated pressure downstream. As is true with
most regulators, the Mark 627 has an outlet pres­sure rating that is lower than the inlet pressure rat­ing. Over-pressure protection is needed to avoid
over-pressure if the actual inlet pressure can ex­ceed the outlet pressure rating.
The regulator may be installed in any orientation 4.
as long as the ow is in proper agreement with
the ow arrow on the side of the body. However,
the regulator should be positioned such that the
screened vent will not collect debris or moisture.

Vent Line Option

The Mark 627 includes a vent in the upper housing (24).
If there is concern about build-up of gas in a conned
location, the vent assembly (25) may be removed to al­low installation of a remote vent line. With the vent as­sembly removed, a vent line may be installed into the ¾”
NPT port. This vent line should be as large a diameter as
possible and should utilize minimal bends and elbows.
Furthermore, the vent line opening should be protected
from weather or debris and should be checked regularly
for blockage.

Start-up Operation

WARNING! Release downstream pressure to
prevent a potential over-pressure of the dia­phragm. Failure to do so may result in property
damage and/or personal injury. Always employ
upstream and downstream pressure gauges to
monitor startup pressures.

Assuming that the regulator is isolated with shutoff
valves on both the upstream and downstream sides,
slowly open upstream valve followed by slowly opening
the downstream valve. Check all connections for leaks
and make necessary output adjustments by manipulating
the adjusting screw (29) per the adjustment procedures
below.

Adjustment

The range of adjustment for a particular regulator is
indicated on the nameplate. Different ranges can be
achieved by substituting a different spring (27).

IMPORTANT: If a new spring is installed the name­plate must be remarked to indicate the new pressure
range.

Refer to Tables 1 and 2 prior to adjustment for pres-1.
sure and ow information, assuring that the chosen
spring will facilitate the desired pressure regulation
and that the maximum pressure output does not
exceed the downstream system pressure limits.
Remove the cap (30) and loosen the jam nut (28). 2.
To INCREASE pressure:3. Turn adjustment screw
clockwise.
To DECREASE pressure:4. Turn adjustment screw
counterclockwise.
Once the desired pressure is achieved, hold adjust-5.
ment screw while securing the jam nut and replace
cap.

Shutdown

the ow will result in accelerated wear on the disc as­sembly (9) and seat (2).

Replacing the Disk Assembly and Seat

Remove cap screws (3), separating the diaphragm 1.
case (5) and upper housing (24) as a unit.
Inspect the seat (2) and remove / replace if neces-2.
sary. Apply general purpose lubricant to threads of
new seat prior to installation.
Inspect disc assembly (9) for wear / damage. 3.
Should replacement be necessary, remove the hair
pin clip (13) that holds the disc assembly to the
stem (10). Install new disc assembly by aligning the
hole in the disc assembly and stem and reinstalling
the hair pin clip.
Should stem maintenance be required proceed as 4.
follows:

Remove the boost body (6), stabilizer (7) and a.
stem guide (8) form the diaphragm case. Un­hook and remove the stem from the lever (15)
and remove the diaphragm case.
Remove and inspect the diaphragm case o-ring b.
(4) and replace as necessary, being sure to lib­erally lubricate with a general purpose grease

prior to installation in the boost body.
To reassemble, insert the stem into the diaphragm 5.
case and hook into the lever. Be sure to position
the diaphragm case assembly such that the pilot
tube is inserted into the Outlet side of the body.
Secure the diaphragm case assembly to the body
with the two cap screws. Torque the cap screws to
25 ft.-lbs. (34 N•m).

WARNING! Downstream pressure must be re­leased to prevent an over-pressurization of the
diaphragm. Failure to do so may result in prop­erty damage and/or personal injury.

Close the upstream block valve followed by closing 1.
the downstream block valve. Open the nearest vent
valve between the regulator and the downstream
block valve.

Maintenance

Routine maintenance should be expected due to normal
wear and tear, damage from external sources or debris.
The regulator components, especially the moving and
sealing parts, should be inspected periodically and re­placed as necessary. Frequency of inspection/replace­ment depends upon severity of conditions, but may also
be required by local/state/federal law or industry stan­dards.

Body Area Maintenance

Large pressure drops or large amounts of particulate in

Diaphragm Assembly and Upper Housing
Maintenance

IMPORTANT! Prior to accessing the spring (27) all
pressure must be released from the diaphragm case.

Remove the cap (30), loosen the jam nut (28) and 1.
turn the adjusting screw (29) counter-clockwise un­til all spring compression is relieved.
Remove the upper housing cap screws (31) and re-2.
move the upper housing. If changing the spring or
adjusting the upper housing position, do so at this
point and reinstall spring, upper spring seat (26)
and upper housing cap screws and readjust regula­tor per the instructions under Start-Up Operation
on page one.
If diaphragm assembly maintenance is required, re-3.
move the diaphragm assembly by tilting it such that
the post and pin assembly (19) slips off the lever
(15). If lever replacement is necessary, free it by
removing the lever cap screws (18). Install the new
lever into the lever retainer (16) by inserting the
lever pin (17). Secure the entire assembly into the
diaphragm case by reinstalling the lever cap screws
and torquing them to 7 ft.-lbs. (9 N•m).

-2-