Jordan Valve Mark 5108 Series Back Pressure Regulator - Manual (Page 2)

M
aIn
V
alVe (M
ark
5108 & M
ark
6127)
In addition, it is highly recommended that:
1. Isolation valves (e.g., gate or butterfly) be installed
on the inlet and discharge sides of the valve to
facilitate isolating the valve for maintenance.
2. Pressure gauges be installed at the inlet and outlet
sides of the valve to provide monitoring of the
valve during initial start-up and during operation.
The body side ports, if unused by the pilot system,
provide a convenient connection for the gauges.
3. All valves larger than 6" be installed horizontally, i.e.,
with the bonnet pointed up, for ease of adjustment
and maintenance servicing.
M
aIntenance
The Jordan Mark 5108 and 6127 Series requires no
lubrication and a minimum of maintenance. However, a
periodic inspection should be established to determine
how the fluid being handled is affecting the efficiency
of the valve. In a water system, for example, the fluid
velocity as well as the substances occurring in natural
waters, such as dissolved minerals and suspended
particles, vary in every installation. The effect of
these actions or substances must be determined
by inspection. It is recommended than an annual
inspection, which includes examination of the valve
interior, be conducted. Particular attention should be
paid to the elastomeric parts, i.e., the diaphragm and
seat disc. Any obviously worn parts should be replaced.
r
epaIr
p
roceDures
In the event of malfunction of the Jordan Valve,
troubleshooting should be conducted according to the
procedures outlined for the specific model of valve.
Then, if those steps indicate a problem with the main
valve, this section will outline the procedures necessary
to correct the problem.
Problems with the main valve can be classed in three
basic categories:
1. VALVE FAILS TO OPEN
A.) Diaphragm damaged*- See Procedure A
B.) Stem binding - See Procedure B
C.) Object lodged in valve - See Procedure B
2. VALVE FAILS TO CLOSE
A.) Diaphragm damaged*- See Procedure A
B.) Stem binding - See Procedure B
C.) Object lodged in valve - See Procedure B
3. VALVE OPENS AND CLOSES BUT LEAKS WHEN
CLOSED
A.) Seat disc damaged - See Procedure C
B.) Seat ring damaged - See Procedure D
*A diaphragm failure can prevent the valve from either opening
or closing, depending on the flow direction. Most water service
valves flow "under the seat", in which case a diaphragm failure
will keep the valve from closing. On the other hand, most fuel
service valves flow "over the seat", in which case a diaphragm
failure will keep the valve from opening. To determine which you
have, examine the bridge mark cast into the side of the valve
body, then compare it with the figures below.
-2-
M
ark
5108 & 6127 S
erieS
M
ain
V
alVe