LowFlow Mark 5800HP Series Back Pressure Regulator User Manual
Assembly instructions
3170 Wasson Road • Cincinnati, OH 45209 USA
Phone 513-533-5600 • Fax 513-871-0105
[email protected] • www.lowflowvalve.com
I & M 5800HP/5850HP Series
Installation & Maintenance Instructions for
Mark 5800HP & Mark 5850HP Regulating Valves
Warning: Low Flow 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 leak-
age 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 LowFlow/Jordan product will provide you with long,
trouble-free service if it is correctly installed and main-
tained. Spending a few minutes now reading these in-
structions can save hours of trouble and downtime later.
When making repairs, use only genuine LowFlow Valve
parts, available for immediate shipment from the factory.
Assembly Instructions
1. Inspect the Teflon soft seat insert. There can be no burrs,
cuts, or scratches in the ID sealing area of the insert.
2. Install the soft seat insert into the orifice.
3. Thread the seat cap on top of the insert and tighten
securely.
4. Apply liquid Teflon (Loctite 567) to the exposed
threads of the seat assembly.
5. Assemble the seat assembly into the body and
torque to 200 in-lbs.
6. Lube the piston and cylinder o-rings with Dow
Corning grease.
7. Assemble the o-rings to the mating parts.
8. Install the Teflon piston bushing onto the piston.
9. Slide the piston into the cylinder as shown, being
careful not to damage the o-ring.
10. Install the plug, plug spring, follower, and stem seal
into the piston in order as shown below.