LowFlow Mark 708HP Series 8000 psi Control Valve - Manual

3170 Wasson Road • Cincinnati, OH 45209 USA
Phone 513-533-5600 • Fax 513-871-0105
[email protected] • www.lowflowvalve.com
I & M Mark 708HP / 708HPA
Installation & Maintenance Instructions for
Mark 708HP/708HPA 35M Actuator
Warning: Jordan LowFlow Control Valves must only be used, installed and repaired in accordance with these Instal-
lation & 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 LowFlow 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
To control very low flow rates, Mark 708HP/HPA 1.
control valves are often provided with trims having
very small clearances. To keep this trim function-
ing properly, it is essential that the fluid flowing
through the valve be clean.
To protect the valve from grit, scale, thread chips 2.
and other foreign matter, ALL pipelines and piping
components should be blown out and thoroughly
cleaned before the installation process begins.
Shutoff valves, pressure gauges, and by-pass pip- 3.
ing should be installed as indicated in the Ideal In-
stallation Schematic to provide easier adjustment,
operation and testing.
A line strainer should be installed on the inlet side 4.
of the valve to protect it from grit, scale, and other
foreign matter. A 0.033 perforated screen is usu-
ally suitable for this purpose. Line strainers are
available from Jordan Valve.
For best control, 3’ 0” straight sections of pipe 5.
should be installed on either side of the valve.
In preparing threaded pipe connections, care 6.
should be exercised to prevent pipe-sealing com-
pound from getting into pipelines. Pipe sealing
compound should be used sparingly, leaving the
two end threads clean. Jordan uses, and recom-
mends, thread sealer Teflon ribbon.
The flow arrow on the valve body must be pointed 7.
in the direction of the flow. Ideally the valve should
be installed in the highest horizontal line of piping
to provide drainage for inlet and outlet piping, to
prevent water hammer, and to obtain faster re-
sponse.
If possible, install a relief valve downstream from 8.
the valve. Set at 15 psi above the control point of
the valve.
In hot vapor lines, upstream and downstream pip- 9.
ing near the valve should be insulated to minimize
condensation.
Evaluate inlet and outlet pipe friction losses and 10.
velocities to decide when smaller outlet piping
might cause, excessive back pressure. When re-
quired, a standard tapered expander connected to
the outlet of the valve is recommended.
Where surges are severe, a piping accumulator is 11.
recommended.
Start-Up Procedure
Be sure that the action of the control valve and 1.
of the controller are such that you achieve the
desired results. The action can be changed if
needed using the instructions shown in “Reversing
Action”.
Increase in
temperature or
pressure must:
And the action of the
valve is:
Then the action
of the controller
must be:
Close Valve Air to Close (direct) Direct
Close Valve Air to Open (reverse) Reverse
Open Valve Air to Close (direct) Reverse
Open Valve Air to Open (reverse) Direct
1. Shut off Valve
2. Pipe Union
3. Strainer and Drain Valve
4. Pressure Gauge
5. Mark 708HP/HPA
6. Relief Valve
3 4
1
5
1
4
6
R
2 2
1
1