Jordan Valve Mark 695 User Manual

I & M Mark 695 Series

3170 Wasson Road • Cincinnati, OH 45209
Phone [phone] • Fax [phone] (f)
[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 qualified service person; continued operation may cause system failure
or a general hazard. Before servicing any valve, disconnect, shut off, or bypass all pressurized fluid. Before disas­sembling a valve, be sure to release all spring tension.

Please read these instructions carefully!

Your Jordan Valve product will provide you with
long, trouble-free service if it is correctly installed
and maintained. Spending a few minutes now read­ing these instructions can save hours of trouble and
downtime later.
When making repairs, use only genuine Jordan Valve
parts, available for immediate shipment from the fac­tory.

Ideal Installation

Installation & Maintenance Instructions for the

Mark 695 Internally Piloted Tank Blanketing Valve

5. It is strongly recommended that the installer read
and be thoroughly familiar with API 2000, Standard

Information for Tank Blanketing Regulator Selection
before installing and attempting to operate this
product.

Control Line

A control line must be installed as follows:

1. Connect one end of a 3/8” tube to the fitting on the
bottom of the main valve actuator.

2. Connect the other end to an appropriate fitting on
the tank.

3. DO NOT locate the control line tap in any location
where turbulence or abnormal velocities may occur.

4. The control line should be sloped away from the
valve.

5. Install a pressure gauge to measure pressure in the
tank itself, not in the outlet piping or the control line
to aid in setting the valve.

1. To protect the valve from grit, scale, thread
chipsand other foreign matter, ALL pipelines
and pipingcomponents should be blown out and
thoroughly cleaned before the installation process
begins.

2. Shutoff valves, pressure gauges and by-pass piping
are optional, and if installed should be in accordance
with all applicable codes, standards, and practices.
They are recommended to provide easier adjustment,
operation, and testing.

3. The flow arrow on the valve body must be pointed
in the direction of flow. Ideally, the valve should be
installed in the highest horizontal line of piping.

4. Install the relief valve on the tank. Set above the
control point of the valve but below the maximum
safety limit for the tank.

Control Line Piping Recomendation

• Keep the regulator as close to the tank as possible

and as high as possible.

• Minimize the length of the downstream pipe coming

from the valve.

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Mark 695 Series Tank Blanketing Valve

• NEVER reduce the pipe size on the valve outlet to the

tank. This line must always be as large as the valve
size, or one pipe size larger to assure it does not act
as a restriction.

• Any downstream isolation valve after the regulator

must be a full port type. The isolation valve cannot
act as a restriction.

• The sensing line must be a minimum of 3/8” tube.

• A sensing line isolation valve is recommended Again,

must be full ported.

• Slope the sensing line to the sensing port on the

tank.

• Keep the sensing line as short and straight as

possible.

• For each 10 feet of sensing line, increase the tube by

1/8”. (Especially important on the blanket pressures
of less than 5 inches of water column).

• Keep the sensing port on the tank as far removed as

possible from the downstream pipe outlet going into
the tank.

Start-Up

With the inlet, and bypass shutoff valves closed,
and no pressure in the downstream line:

1. Slowly open the inlet valve just enough to start
flow through the valve. Observe the tank pressure
gauge. Increase the downstream pressure slowly by
gradually opening the inlet valve.

2. Do not fully open the inlet valve until you are sure that
the regulator has control of the system. Usually, the
handwheel on the inlet valve will turn freely when this
is achieved.

3. To change the controlled pressure, adjust the set
screw (25), and secure with the jam nut (26), and the
closing cap (12).

Trouble Shooting

The first step in troubleshooting a piloted pressure
regulator is to classify the action of the controlled
pressure into one of the following categories:

The next step is to determine what could cause the
trouble. The third step is to locate and remedy the cause
by the process of elimination. Make no assumptions and
check the easy ones first. The guide below lists the
controlled pressure action, common causes and
procedure for checking each cause.

Controlled pressure action UNDER PRESSURE:

• Valve undersized for application. Check capacity

required and valve capacity. As described in API-

2000.

• Line strainer screen clogged. Blow down strainers or

visually check that they are clear.

• Incorrect setting on range spring. Vary the setting

and check response.

• Main valve diaphragm or balance diaphragm

ruptured. See section on valve maintenance.

• Malfunction of other piping components. Check

for leaking safety valves, inadvertently opened or
closed valves.

Controlled pressure action OVER PRESSURE:

• Incorrect setting on range spring. Vary the setting

and check response.

• Main valve seats leaking. Close inlet shut-off valve,

allow downstream pressure to bleed off, close outlet
valve and remove loading pressure tubing. Back out
adjusting screw on valve until free. Crack open inlet
shut-off valve - if the fluid issues from the main valve
port, the main valve seats are leaking.

• By-pass shut-off leaking. During period of leakage

close outlet shut-off valve, observe downstream
pressure gauge

• Under certain circumstances, the vent valve may be

open when the tank is not being filled. This may not
be caused by an inability to control or seat leakage.
The tank may be “outbreathing” due to increases
in the temperature of the gas or contents inside the
tank.

Controlled Pressure Fluctuates:

• Valve oversized. Check capacity required and valve

capacity per API 2000.

A. Under Pressure: Controlled pressure too low; not
enough flow or no flow through valve.
B. Over Pressure: Valve will not close or controlled
pressure increases after valve closes.
C. Pressure Fluctuates: Controlled pressure rises and
falls, will not settle out under low loads.

Main Valve

Note: All work to the main valve can be accomplished
in-line. The only reason to remove the valve is if
the location makes it too difficult to work on the
regulator.

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Mark 695 Series Tank Blanketing Valve

Diaphragm Replacement

Parts Required for this operation: seal washer (27),
diaphragm (11), two actuator case gaskets (21), and
closing cap o-ring (45).

1. Remove closing cap (12). Remove and discard
closing cap o-ring (45).

2. Mark position of adjusting screw (25) where it meets
the jam nut (26).

3. Slightly loosen the jam nut (26) and remove the
adjusting screw (25), leaving the jam nut in position.

4. Remove actuator case bolts and washers (23)(35)
(36). Remove upper actuator case assembly (16).

5. Remove the upper spring guide (20) and range
spring (38). Remove the diaphragm assembly (15).

6. Remove and discard the upper and lower actuator
case gaskets (21).

7. Remove the diaphragm retaining nut (22) from the
diaphragm assembly. Remove the upper diaphragm
plate (15), diaphragm (11), lower diaphragm plate
(14), and discard the seal washer (27).

If replacing only the diaphragm, reassemble in reverse
order using new replacement parts. If replacing internal
seals or other parts, continue to section below.

Internal Seal Replacement

Parts Required for this operation: Jordan Valve seal kit
consisting of the following parts: teflon sheet gasket (13),
pilot upper cage o-ring (32), two pilot body inner o-rings
(31), pilot plug o-ring (29), rolling diaphragm-pilot (17),
pilot body/main body o-ring (34), main piston o-ring (5),
main plug o-ring (33), and four threadseal washers (43).

1. Remove the four HHCS (28), discard the threadseal
washers (43), and lift off the actuator lower case (9).

2. Remove and discard the flat teflon gasket (13). Re­move and discard the pilot upper cage o-ring (32).

3. Firmly grasp the stem of the pilot plug (4) and pull
the pilot upper cage (8) out of the pilot body (2).
Remove the pilot plug return spring (40) and the pilot
lower cage (7) from the pilot body (2).

4. Remove the pilot plug assembly (4)(17)(30) from the
pilot upper cage.

5. Referring to the tubing connection inset, disconnect
the tubing at points (A) and (B).

6. Remove and discard the two pilot body inner o-rings
(31).

1. Separate the main body (1) from the pilot body (2).
Remove and discard the pilot body / main body o­ring (34).

2. Remove the main plug assembly (3), main plug
return spring (39), and the spring spacer (18). Re­move and discard the main piston o-ring (5) from the
main piston (3).

3. Refer to section “B”. Remove screw (42) and lock­washer (41) from the main piston. Remove the main
plug (6) and replace the main plug o-ring (33).
Replace main plug (6), lockwasher (41), and screw
(42). Replace the main piston o-ring (5).

10. Place the plug assembly back on its seat in the main
body. Place the spacer (18) and the return spring
(39) into the main plug assembly.

11. Replace the pilot body / main body o-ring (34).
Place the pilot body (2) back onto the main body (1).
Reconnect the tubing at points (A) and (B).

12. Retrieve the pilot plug assembly (4)(17)(30) from
step 4 above. Separate the components and discard
the pilot rolling diaphragm (17).

13. Rebuild the pilot plug assembly using a new rolling
diaphragm from the repair kit. Make sure the “bead”
on the rolling diaphragm faces the pilot piston (30)
as shown in Detail ‘A” on the parts diagram. Install
the new the pilot plug o-ring (29) onto the pilot plug
(4).

14. Install the two new pilot body inner o-rings (31).

15. Place the pilot lower cage back into the pilot body
bore. Place the pilot return spring (40) into the pilot
lower cage.

16. Place the pilot plug assembly into the pilot lower
cage, making sure the “bead” on the pilot rolling dia­phragm goes into the groove on the top of the pilot
lower cage (7).

17. Install the pilot upper cage (8) into the pilot body (2),
making sure the stem of the pilot plug (4) is visible
through the top of the pilot upper cage. Install a new
pilot upper cage o-ring (32).

18. Replace the teflon gasket (13), and place the lower
case (9) onto the top of the teflon gasket. Secure the
lower case to the pilot body and the main body with
four HHCS (28) and four new threadseal washers
(43).

Return to Section I above and reassemble in reverse
order

Filter/Dripwell Maintenance

Please refer to the documentation for the filter/dripwell
that was supplied with your valve for periodic recom­mended maintenance of this accessory.

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