Page 2 of 7 HP300-IOM Rev. 0 6/20
THIS INFORMATION IS SUBJECT TO THE CONTROLS OF THE EXPORT ADMINISTRATION REGULATIONS (EAR). THIS INFORMATION SHALL NOT BE PROVIDED TO
NON-US PERSONS OR TRANSFERRED BY ANY MEANS TO ANY LOCATION OUTSIDE THE UNITED STATES CONTRARY TO THE REQUIREMENTS OF THE EAR.
INSTALLATION
The HP300 can be line or panel bracket mounted. For line
mounted applications, refer to porting configurations for proper
orientation of ports.
Panel bracket mounting can be achieved using the two 1/4-20
threaded mounting holes in the bracket. These threaded
mounting holes are spaced 2.80” (71.1 mm) apart.
PRINCIPLE OF OPERATION
Turning the control knob clockwise will increase the force
on the range spring and in turn the outlet set pressure.
Conversely, turning the control knob counterclockwise will
decrease the force on the range spring and decrease the outlet
set pressure. In equilibrium, the force exerted by the range
spring is balanced by the outlet pressure.
An unbalance between the outlet pressure and the set
pressure causes a corresponding reaction on the sensor and
valve. If the outlet pressure rises above the set pressure, the
piston sensor will lift allowing the main valve to seat. This
action causes the relief valve to open relieving the excess
pressure to atmosphere until equilibrium is reached.
If the outlet pressure falls below the set pressure, the range
spring will push the sensor down and unseat the main valve.
This allows supply pressure to flow through the main valve to
the downstream port increasing output pressure. At
equilibrium, the valve plug assumes a position which supplies
the required flow while maintaining the outlet pressure at the
set pressure. See figure 2 on page 5 for labeled assembly.
MAINTENANCE
All regulators require scheduled maintenance to remove
deposits left by the media and to replace parts worn or
damaged as a result of use. Annual maintenance is
recommended when the regulator is used under normal
conditions. More frequent maintenance may be required due to
the condition, cleanliness and/or corrosiveness of the media.
TOOLS REQUIRED
1/4”Open end wrench (“T” handle disassembly)
3/16” Wide, flat blade screwdriver (relief adjustment screw)
5/16” Wide, flat blade screwdriver (spring button screw)
1/2” Open end wrench (spring base on sensor assembly)
1/2” Wide, narrow blade screwdriver (sensor)
1/2” Socket (main valve gland)
3/4” Wide, narrow ground screwdriver (valve body)
1-3/4” Open end or crowfoot wrench (for the bonnet)
Pin Vise (remove sensor relief valve seat)
Pliers (to remove sensor assembly)
Retaining ring pliers (handknob retaining ring)
Tweezers (to remove connector pin from the main valve gland)
Other possible tools would be a vise, a clean lint-free cloth,
and a torque wrench.
CAUTION: MAINTENANCE
It is recommended that maintenance be performed by a person
experienced in the operation and repair of high pressure
regulators.
Maintenance of this unit is best performed by gripping a
protruding end of a pipe fitting installed into the regulator body.
WARNING: Bleed System Pressure Prior to Removing
Regulator for Servicing.
MAINTENANCE PROCEDURE
1. Adjust the handwheel to the full counterclockwise position.
Remove the hole plug and with retaining ring pliers remove the
retaining ring. Grip the handwheel firmly and pull upward until
free.
2. Unscrew the bonnet using 1-3/4” open end or crowfoot
wrench. This will come off as an assembly containing the
bonnet, thrust bearing assembly, spring button screw, spring
button, adjusting stem, stem rod, stem screw, and stem spring.
Note that the rod will drop free when the bonnet is unscrewed.
Lift off the range spring.
3. To service components in the bonnet assembly, remove
spring button screw. The adjusting stem, thrust bearing
assembly, and spring button will drop out. Unthread the stem
screw and remove the stem spring.
4. To remove the sensor assembly grip the spring base with
pliers and pull upward until assembly is free. Lift out the sensor
assembly backup ring and the sensor assembly O-ring.
5. Lift out the connector pin and then remove seat gland and
main valve seat using 1/2” socket.
6. Remove the main valve body as an assembly using 3/4”
screw driver.
7. With the main valve assembly removed from the body hold
firmly in hand and unthread the filter. The main valve plug and
main valve spring will drop out. Remove and inspect the valve
body backup ring and the valve body O-ring.
8. To disassemble the sensor assembly, grip the sensor and
unthread the spring base using a 1/2” open end wrench. When
the spring base is removed, the vent seat will be freed. With
your thumb, firmly push sensor until it is freed from the sensor
ring. Remove the O-ring and backup ring. The vent plug and
spring can be removed for inspection.
NOTE: See figure 3 on page 5 for exploded view.
THE REGULATOR IS RE-ASSEMBLED IN THE
REVERSE ORDER OF DISASSEMBLY, OBERSVING
THE FOLLOWING PRECAUTIONS:
1. Inspect all component parts and replace those worn or
damaged with ITT Conoflow replacement parts. Always
replace the valve seats if they have been removed.
2. All component parts should be cleaned to the cleanliness
level required for safe operation with the media used. All parts
in the flow stream must be free of particles which could prevent
proper seating of the main valve.
