Legend Brands 111843 Suttner Brass Pressure Regulator - Sapphire Scientific 23-010 / Prochem 8.635-294.0
Replacement Brass Pressure Regulator for Carpet Cleaning Truckmounts
The Legend Brands 111843 pressure regulator is a Suttner-style adjustable brass water pressure regulator used in selected Sapphire Scientific, Prochem, and Legend Brands truckmounted carpet cleaning machines.
This regulator helps maintain the desired operating pressure by allowing excess water pressure to bypass back into the truckmount water system.
Proper pressure regulation is especially important on truckmounted carpet cleaning machines equipped with heat exchangers, where excessive water pressure can damage expensive components.
Replacement and Cross Reference Part Numbers
This pressure regulator is associated with the following manufacturer and legacy part numbers:
- Legend Brands: 111843
- Sapphire Scientific: 23-010
- Sapphire Scientific: 23010
- Sapphire Scientific: 23-140
- Sapphire Scientific: 23140
- Sapphire Scientific: 23-147
- Sapphire Scientific: 23147
- Prochem: 8.635-294.0
- Prochem: 86352940
- Manufacturer: Suttner
Current Legend Brands Part Number: 111843
The manufacturer identifies 111843 as a 1/4-inch NPT Suttner pressure regulator.
Some older equipment manuals and parts diagrams identify this component as 23-010.
Verify the required regulator configuration and connection sizes against your equipment parts manual before ordering.
Technical Specifications
| Manufacturer |
Suttner / Legend Brands |
| Current Part Number |
111843 |
| Older Part Number |
23-010 |
| Component Type |
Adjustable Water Pressure Regulator |
| Body Material |
Brass |
| Thread Connection |
1/4-inch NPT |
| Maximum Pressure |
3600 PSI* |
| Maximum Flow |
8 GPM* |
| Maximum Temperature |
200 Degrees F* |
| Internal Components |
Stainless Steel Piston and Seat* |
| Application |
Truckmount Water Pressure Regulation |
*Specifications are published for the 23-010 Suttner-style regulator. Confirm specifications for the supplied 111843 configuration before operating at maximum ratings.
Common Truckmount Applications .jpg)
This regulator is listed in parts information associated with selected:
- Sapphire Scientific 370 SS truckmounts
- Sapphire Scientific Rage truckmounts
- Prochem Peak truckmounts
- Other compatible Prochem and Legend Brands truckmount systems
Applications vary by model, production year, and equipment configuration. Always verify the original equipment part number.
What Does a Truckmount Pressure Regulator Do?
A carpet cleaning truckmount uses a high-pressure water pump to deliver cleaning solution through the solution hose to the cleaning wand, upholstery tool, or hard surface cleaning tool.
Different cleaning applications require different water pressures.
For example:
- Upholstery Cleaning: Generally requires lower operating pressure to avoid oversaturating delicate fabrics.
- Carpet Cleaning: Typically uses moderate operating pressure depending on the cleaning tool and carpet.
- Tile and Grout Cleaning: May require substantially higher water pressure depending on the surface and cleaning equipment.
The pressure regulator helps control the pressure supplied by the pump while allowing excess water to bypass through the system.
Helps Protect Truckmount Heat Exchangers
Many truckmounted carpet cleaning machines use heat exchangers to recover heat from the engine or blower exhaust system.
These heat exchangers contain internal water passages that must operate within their designed pressure limits.
Excessive water pressure can damage heat exchanger components, fittings, hoses, and other plumbing components.
A properly installed and adjusted pressure regulator helps prevent excessive operating pressure.
Some truckmount configurations use a pressure limit of approximately 1000 PSI to help protect the heat exchanger.
Important: The correct regulator setting depends on the specific truckmount model and plumbing configuration. Always follow the equipment manufacturer's pressure adjustment instructions.
Symptoms of a Worn or Malfunctioning Pressure Regulator
A pressure regulator that is worn, contaminated, or improperly adjusted may contribute to:
- Unstable or fluctuating water pressure
- Difficulty maintaining the selected cleaning pressure
- Excessive system pressure
- Pressure that does not respond properly to adjustment
- Pressure spikes when the cleaning tool is closed
- Excessive water bypass
- A regulator adjustment stem that becomes difficult to turn
These symptoms can also result from other problems, including worn pump valves, restricted filters, leaking plumbing, or damaged pressure gauges.
Pressure Regulator Maintenance
Legend Brands service documentation recommends periodic lubrication of the pressure regulator O-ring and adjustment stem.
For the Sapphire Scientific 370 SS, the service manual recommends lubrication approximately every 50 operating hours or whenever necessary.
Before servicing:
- Shut down the truckmount.
- Disconnect the incoming water supply.
- Relieve all pressure from the water system.
- Allow hot components to cool.
- Follow the manufacturer's instructions for removing and servicing the regulator.
- Inspect and lubricate the regulator components as specified by the manufacturer.
- Reassemble and test the system for leaks and correct pressure regulation.
Safety Warning: Never remove the regulator adjustment cap or disassemble the regulator while the truckmount is running or the system is pressurized.
Manufacturer Manuals and Parts Diagrams
The following manufacturer documents contain additional information about the Sapphire Scientific pressure regulation system.
Legend Brands Sapphire 370 SS Parts Listing - PDF
This parts listing identifies Legend Brands 111843 as a 1/4-inch NPT Suttner regulator in the pressure regulator and bypass valve assembly.
Sapphire Scientific 370 SS Service and Operation Manual - PDF
The service manual provides pressure regulator adjustment instructions, maintenance information, and an exploded regulator diagram.
Frequently Asked Questions
What does Legend Brands part number 111843 replace?
Legend Brands 111843 is associated with older Sapphire Scientific part number 23-010 and Prochem part number 8.635-294.0. Other legacy references include 23-140 and 23-147.
Is 111843 used on the Sapphire Scientific 370 SS?
Yes. Legend Brands identifies 111843 in the Sapphire Scientific 370 SS pressure regulator and bypass valve assembly.
What is the maximum pressure rating?
Published specifications for the 23-010 Suttner-style regulator list a maximum pressure rating of 3600 PSI. This is the component rating, not the recommended operating pressure for your truckmount.
Can this regulator help protect a heat exchanger?
Yes. Proper pressure regulation helps limit excessive water pressure that could damage a truckmount heat exchanger. The regulator must be correctly installed and adjusted for the specific equipment.
Is this the same as the main pump unloader?
Not necessarily. Truckmount systems may use different regulators, unloaders, and pressure-limiting components. Identify the correct component using the manufacturer's plumbing schematic and parts diagram.
Can this regulator be used for tile cleaning?
It may be used on compatible truckmount systems that support higher-pressure cleaning applications. The allowable operating pressure is determined by the complete machine, including the pump, heat exchanger, hoses, fittings, and cleaning tools.
Important Ordering Information
Order by manufacturer part number, not image. Product appearance, finish, and component configuration may change without notice. The manufacturer reserves the right to change specifications and appearance.
Protect the regulator and associated water system from freezing.
| 
English
French
Spanish
German
Italian
Portuguese
