data sheet - Cat Pumps

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DATA SHEET

THERMO VALVES Brass Models:

7140, 7141, 7142, 7143, 7144, 7145, 7146, 7170, 7171, 7172, 7175, 7176, 7177 SPECIFICATIONS

1/4" NPT 3/8" NPT 1/2" NPT

FEATURES •P  rotects pump from premature failure of seals and cups by eliminating heat build-up in closed loop by-pass systems. •C  hoice of three port sizes to allow convenient and easy installation into the by-pass loop. •A  utomatically seats during unloader/regulator pressure spikes to prevent liquid bleed. • Temperature protection without interruption in flow. • Compatible with systems using either unloader or regulator valves. • Mount multiple thermo valves in-line to handle increased system flow. • Optional by-pass hose with thermo valve for quick, compact installation.

SELECTION

The thermo valve is a simple device designed to be installed in the by-pass line of the regulating device when the by-pass liquid is being recirculated to the inlet of the pump. This thermo valve is effective with either a pressure regulator or an unloader.

INSTALLATION

Exercise caution when installing the thermo valve as to not exceed the maximum inlet pressure of the valve or the pump. NOTE: The thermo valve must be installed with a pressurized pump inlet. When installed in a piston pump application with the by-pass routed directly to the inlet line, the maximum inlet pressure to the pump is 40 psi and a pressure reducing valve must be installed between the thermo valve and pump inlet. When installed in a plunger pump application with the by-pass routed directly to the inlet line or inlet port, the maximum inlet pressure to the pump is 60-70 psi and a pressure reducing valve must be installed between the thermo valve and the pump inlet.

130° – 7146 Max. Inlet Pressure Inlet Port (7146) Bleed Port Weight Dimensions 145° – 7140, 7141, 7142 Max. Inlet Pressure Inlet Port (7140) Inlet Port (7141) Inlet Port (7142) Bleed Port Weight Dimensions 165° – 7143, 7144, 7145 Max. Inlet Pressure Inlet Port (7143) Inlet Port (7144) Inlet Port (7145) Bleed Port Weight Dimensions 180° – 7170, 7171, 7172 Max. Inlet Pressure Inlet Port (7170) Inlet Port (7171) Inlet Port (7172) Bleed Port Weight Dimensions 190° – 7175, 7176, 7177 Max. Inlet Pressure Inlet Port (7175) Inlet Port (7176) Inlet Port (7177) Bleed Port Weight Dimensions

U.S. Measure

Metric Measure

125 psi 1/4" NPT(M) 1/8" NPT(F) 6.2 oz. 3.0 x 88"

8.6 bar 1/4" NPT(M) 1/8" NPT(F) 0.17 kg 76 x 22 mm

125 psi 1/4" NPT(M) 3/8" NPT(M) 1/2" NPT(M) 1/8" NPT(F) 6.2 oz. 3.0 x 88"

8.6 bar 1/4" NPT(M) 3/8" NPT(M) 1/2" NPT(M) 1/8" NPT(F) 0.17 kg 76 x 22 mm

125 psi 1/4" NPT(M) 3/8" NPT(M) 1/2" NPT(M) 1/8" NPT(F) 6.2 oz. 3.0 x 88"

8.6 bar 1/4" NPT(M) 3/8" NPT(M) 1/2" NPT(M) 1/8" NPT(F) 0.17 kg 76 x 22 mm

125 psi 1/4" NPT(M) 3/8" NPT(M) 1/2" NPT(M) 1/8" NPT(F) 6.2 oz. 3.0 x 88"

8.6 bar 1/4" NPT(M) 3/8" NPT(M) 1/2" NPT(M) 1/8" NPT(F) 0.17 kg 76 x 22 mm

125 psi 1/4" NPT(M) 3/8" NPT(M) 1/2" NPT(M) 1/8" NPT(F) 6.2 oz. 3.0 x 88"

8.6 bar 1/4" NPT(M) 3/8" NPT(M) 1/2" NPT(M) 1/8" NPT(F) 0.17 kg 76 x 22 mm

NOTE: The thermo valve must be installed with a pressurized pump inlet.

INSTALLATION continued Some regulating devices may have excessive pressure spikes when in by-pass. The maximum inlet pressure to the thermo valve is 125 psi. Caution should be exercised not to exceed 125 psi in the by-pass loop as this may cause harm to both the valve and the pump. For convenience in installation, by-pass hose and thermo valve assemblies are available for 1/4", 3/8" and 1/2" NPT unloader connections.

TROUBLESHOOTING Problems

Probable Cause

Solution

Leaking at low temperature or non by-pass operation through bleed port

• Foreign material trapped

• Check internal and external o-rings on cap for cuts and fit and replace if worn or damaged.

• Damaged o-ring

• Check for deep cuts or imperfect ions on top lip of power pill which o-ring seats.

• Damaged Power Pill

• Check for deep cuts or imperfections on top lip of power pill which seats up to inner cap o-ring and replace if damaged.

OPERATION

As the system liquid is recirculated during the by-pass cycle, the temperature will increase. Frequent or prolonged by-pass can result in extremely high temperature build-up. These high temperatures cause premature failure of cups and seals. Installing the thermo valve protects the pump against these excessive temperatures. The power pill in the thermo valve detects the temperature rise in the liquid and compresses the spring, opening the bleed port and dumping a portion of the over-heated liquid. The thermo valve is most effective when operating with ambient temperature liquids and moderate gpm. As the incoming liquid temperature increases, the quicker the by-pass liquid will reach its temperature release point, forcing the thermo valve to bleed-off.

• Check for malfunctioning power pill stem. Failure of stem to expand and retract will prevent opening and closing of valve. Replace if worn. • Damaged o-ring

Leaks between body and cap

• Check external o-ring on cap and replace if worn or cut.

The higher the system gpm, the more heat generating energy is produced, also forcing the thermo valve to bleed-off. For example, a 25 gpm system @ 130°F will activate the thermo valve much quicker than a 5 gpm system @ 90°F. In high flow systems, it may be necessary to install multiple thermo valves to best prevent overheating the system. Because of the unique design of the thermo valve it will not bleed liquid during a pressure spike from the regulator or unloader as it completely seats and shuts off the flow.

EXPLODED VIEW

Bleed Port

1 2 3 4 5

6

Inlet Port

7

PARTS LIST ITEM P/N

MATL DESCRIPTION

1 2 3 4 5 6 7 — — —

BB NBR D NBR CU S BB — — —

— — — — — — — 7090.40 7091.41 7092.40

Cap, Bleed O-Ring, Cap - Internal Washer, Back-up O-Ring, Cap - External Power Pill Spring Body By-Pass Hose w/7140 Thermo Valve (145°) By-Pass Hose w/7141 Thermo Valve (145°) By-Pass Hose w/7140 Thermo Valve (145°)

MODEL QTY USED

All All All All All All All 2SF 4SF 2SFX 7, 15 — 7093.42 — By-Pass Hose w/7142 Thermo Valve (145°) 5, PFR MATERIAL CODES (Not Part of Part Number): BB=Brass CU=Copper D=Acetal NBR=Medium Nitrile (Buna-N) S=304SS

1 1 1 1 1 1 1 1 1 1 1

• CAUTIONS AND WARNINGS All High Pressure Systems require a primary pressure regulating device (i.e. regulator, unloader) and a secondary pressure relief device (i.e. 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/cautionswarnings or can be requested directly from Cat Pumps. WARRANTY View the Limited Warranty on-line at www.catpumps.com/warranty. CAT PUMPS 1681 - 94TH LANE N.E. MINNEAPOLIS, MN 55449-4324 PHONE (763) 780-5440 — FAX (763) 780-2958 e-mail: [email protected] www.catpumps.com For International Inquiries go to www.catpumps.com and navigate to the “Contact Us” link.

PN 993179 Rev C 5/17

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data sheet - Cat Pumps

DATA SHEET THERMO VALVES Brass Models: 7140, 7141, 7142, 7143, 7144, 7145, 7146, 7170, 7171, 7172, 7175, 7176, 7177 SPECIFICATIONS 1/4" NPT 3/8" NP...

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