CAT Pumps 7350 User manual

DATA SHEET
PRESSURE REGULATOR
FEATURES
• Maintains full pressure while running in idle for quick return
to system pressure.
• Stainless steel conical piston and seat extend valve life by providing
a consistently smooth flow that reduces wear and compensates
for pressure spikes.
• Minimum pressure fluctuations with the alternating use of multiple
guns and nozzles.
• Top adjusting cup and locking nut secure calibrated pressure setting.
• Stainless steel internal parts results in durability and compatibility.
• Standard FPM elastomers promote compatibility with many liquids.
Stainless Steel
Model:
7350
SPECIFICATIONS U.S. Metric
Flow Range 1–12 gpm 3.78–45.4 lpm
Pressure Range 400–1500 psi 27. 5 –103 b ar
Maximum Temperature 180˚F 82˚C
Inlet Port ¼" NPT(F) ¼" NPT(F)
Bypass Port ⁄" NPT(F) ⁄" NPT(F)
Weight 1.42 lbs 0.64 kg
Dimensions 2.26 x 6" 56 x 152 mm

TYPICAL REGULATOR INSTALLATION
1. Pressure Gauge
2. Relief Valve
(Secondary Pressure Relief Device)
3. Pulsation Dampener
4. Pressure Regulator
(Primary Pressure Regulating Device)
5. Triplex Plunger Pump
SELECTION
This pressure regulator is designed for systems with single or multiple
pumps, solenoid (gate) valves, nozzles, shut-off or weep guns.
Note: For multiple-pump systems, it is best to use a pressure regulator,
not a pressure-sensitive regulating unloader.
This regulator should meet both the desired system flow (combined
nozzle flow rate) and the desired system pressure.
NOTICE: Operating below the minimum rated flow of the regulator
will cause the regulator to cycle or chatter. Operating above the maximum
rated flow of the regulator will cause premature regulator wear, regulator
cycling and wear, preventing the desired system pressure.
INSTALLATION
This regulator will operate when mounted in any direction. However,
keeping the plumbing to a minimum and the adjusting cap easily
accessible is preferred. The preferred mounting location is directly
to the pump discharge manifold or perpendicular to the discharge line.
The inlet connection is a ¼” NPT(F) port located on the side.
The bypass connection is a ⁄” NPT(F) port located on the bottom of the
valve body. Bypass liquid is directed out of this port and can be routed
to a reservoir (preferred method), drain or pump inlet.
OPERATION
This pressure regulator maintains system pressure in the discharge line
and at the pump head when the trigger gun or the solenoid (gate) valve
is closed, or the nozzles are clogged, thus bypassing all unrequired flow.
Squeezing the trigger gun or opening the solenoid valve allows
for a quick return to system pressure.
PRESSURE ADJUSTMENT
Note: Pressure is not set at the factory.
1. Setting and adjusting the regulator pressure must be done while
system is running.
2. Start the system with the regulator backed off to the lowest pressure
setting (counterclockwise).
3. Increase the regulator pressure setting by turning the adjustment
cap clockwise.
4. Squeeze the trigger and read the pressure on the gauge at the pump.
Note: Do not read the pressure at the gun or nozzle.
5. If more pressure is desired, release the trigger, turn the adjusting
cap one-quarter turn in a clockwise direction.
6. Squeeze the trigger and reread the pressure.
7. Once the desired system pressure is reached, stop turning the
adjusting cap and thread the jam nut down towards the upper body
of the regulator to lock it in place.
NOTICE: A minimum of 5% of the flow through the regulator should
bypass for proper regulator performance. If the entire regulator flow
pumps through the nozzle (zero bypass), the valve can easily be set
for pressure higher than the desired pressure, causing a malfunction
or premature wear.
8. If desired system pressure cannot be reached, review
TROUBLESHOOTING chart.
Note: Do not adjust regulator pressure setting to compensate for a worn
nozzle. Check the nozzle as part of the regular maintenance and replace
if worn.
Note: A secondary pressure safety relief device (e.g., pop-off valve or
safety valve) should be used along with this pressure regulator. Final
adjustment of the relief valve should relieve at 200 psi above the system
operating pressure.
Read all CAUTIONS and WARNINGS before commencing service or operation of any high-pressure system
5
1
2
3Inlet
Bypass
Discharge
4

SERVICING
Disassembly
1. Disconnect bypass and inlet plumbing from the regulator.
2. Remove regulator from the pump.
3. Secure lower body of regulator in a vise with adjusting handle
facing upwards.
4. Remove adjusting cap by unthreading from the upper body
in a counterclockwise direction.
5. Remove upper body by unthreading from the lower body.
6. Remove spring retainer, spring set and conical piston.
NOTICE: Exercise extreme caution to avoid contact that could damage
the outside diameter and sharp tip of the conical piston.
7. Remove the lower body from the vise and place it on a flat surface
with the bypass port facing upwards.
8. Using a tool with the same diameter as the conical seat, drive out
the conical seat and piston retainer.
NOTICE: Exercise extreme caution to avoid contact and damage to the
inside diameter of the piston retainer, as well as the outside diameter
and tapered surfaces of the conical seat.
Note: With the regulator completely disassembled, inspect the sealing
area where the conical seat and piston retainer make contact within
the regulator’s lower body for grooves, pitting and wear. If damage is
found, stop the repair and replace the lower body. If damage is more
severe, installation of a new regulator is suggested. If no damage is found,
proceed with the reassembly.
Reassembly
1. Place lower regulator body with bypass port facing downwards
in a vise.
2. Lubricate and install the O-ring onto the outside diameter of the
conical seat. Press the conical seat down into the lower regulator
body with the tapered surface facing upwards.
3. Lubricate and install O-ring onto piston retainer. Press piston retainer
with the larger diameter facing downwards.
4. Place conical piston on a flat surface with the sharp point facing
upwards. Lubricate and install backup ring, then O-ring onto the
outside diameter of the conical piston. Lubricate outside diameter
of conical piston.
5. Press conical piston with the sharp point down into piston retainer.
6. Place the upper body with the large opening facing up.
7. Drop spring retainer into the cap, ensuring spring pilot faces up.
8. Drop in 28 spring washers, alternating direction per exploded view on
the last page.
Note: Use a small rod such as an ink pen to guide the washers into the cap
to ensure the proper orientation is maintained.
9. Invert lower body assembly onto upper body and thread together.
10. Thread adjusting cap into the upper body.
11. Re-install the regulator onto the pump.
12. Reconnect bypass and inlet plumbing to the regulator.
13. Proceed to PRESSURE ADJUSTMENT.
TROUBLESHOOTING
Excessive pressure
fluctuations
• Too little flow for valve specifications
• Air in system, poor connections
• Worn low-pressure seals in the pump
• Worn O-ring in the gun
System will not
build up to
pressure
• Worn nozzle
• Improper nozzle size for system specifications
• Foreign material trapped in seat
Pressure drop • Worn nozzle
• Worn regulator seat or piston
• Air in system, poor connections
• Insufficient flow to pump
• Filter clogged. Check and clean regularly
Pressure spikes
while in bypass
• Minimum bypass of 5% not present
• Excessive pressure adjustment made for worn nozzle
REPLACE NOZZLE. Reset system pressure
Leakage from
regulator vent hole
• Piston retainer scored, or worn O-ring
Service with O-ring kit
Read all CAUTIONS and WARNINGS before commencing service or operation of any high-pressure system

401
406
490
410
408
418
427
436
401
468
Inlet
Bypass
EXPLODED VIEWPARTS LIST
ITEM P/N MATL DESCRIPTION QTY
401 30161 —Cap, Adjusting, Assembly 1
(Includes: Cap, Stud, Jam Nut)
406 — STNP Body, Upper 1
408 76229 STL Spring Set 1
410 30726 BB Retainer, Spring 1
418 30566 SSB Piston, Conical 1
427 31488 SS Retainer, Piston 1
436 76724 SSB Seat, Conical 1
440 —SS Body, Lower 1
468 30749 FPM Kit, O-Ring 1
490 34090 STL Panel Mount Assembly (Includes: 2 Jam Nuts) 1
Italics are optional items.
Material Codes (Not Part of Part Number): BB=Brass FPM=Fluorocarbon
SS=316SS SSB=316SS Condition B STL=Steel STNP=Steel Nickel Plated
PN 993367 Rev B 22125 10/22
CAT PUMPS 1681 94th Lane N.E., Minneapolis, MN 55449-4324 P: [phone] F: [phone] E: [e-mail] www.catpumps.com
• CAUTIONS AND WARNINGS
All high-pressure systems require a primary pressure regulating device (e.g. regulator, unloader) and a secondary pressure relief device (e.g. pop-off valve, relief valve). Failure to install such
relief devices could result in personal injury or damage to pump or property. Cat Pumps does not assume any liability or responsibility for the operation of a customer’s high-pressure system.
Read all CAUTIONS and WARNINGS before commencing service or operation of any high-pressure system. The CAUTIONS and WARNINGS are included in each Service Manual and with each
Accessory Data sheet. CAUTIONS and WARNINGS can also be viewed online at www.catpumps.com/dynamic-literature/cautions-and-warnings or can be requested directly from Cat Pumps.
WARRANTY
View the Limited Warranty online at www.catpumps.com/literature/cat-pumps-limited-warranty