Regulator Sizing Tools / Model 243
Model 243 Sizing ToolBeta
Large-capacity regulator for commercial, industrial and gas distribution service, with interchangeable bodies and diaphragm cases. Available with an internal relief valve, a low-pressure cut-off, or in a high-pressure configuration.
What you'll need
- Inlet pressure — psi or bar
- Outlet pressure / set point — psi, in. w.c. or bar
- Gas load or flow rate — CFH, CMH or BTUH
Optional, improves the result
- MAOP (maximum inlet pressure)
- Desired pipe size
- Over-pressure protection — internal relief valve or monitor
- Generator or high-efficiency boiler load percentage
- Gas type — natural gas, propane, or another gas by specific gravity
- Altitude above 3,000 ft
Operating envelope
| Input | Accepted range |
|---|---|
| Inlet pressure | 0.5 – 125 psi |
| Outlet pressure | 3.5" w.c. – 10 psi |
| Outlet vs. inlet | must be lower |
| MAOP | ≥ inlet pressure |
If you request an internal relief valve and your set point is above 4.5 psi, the tool sizes a monitor arrangement instead — an internal relief valve cannot protect above that pressure on this model.
Sizing Tool
Open the Model 243 Sizing Tool
The tool opens in a new tab so you can keep this page open for reference. It returns the body, orifice, spring and calculated capacity, along with the Holland Supply part number and the full sizing tables.
Launch the Model 243 Tool ↗First visit of the day may take about 30 seconds to start up. If you see a message saying the tool is asleep, click “Yes, get this app back up!” and give it a moment.
On a phone? When the tool opens, the input fields start hidden. Tap the » arrows at the top-left of the tool to slide the input panel in, fill it in, then tap the arrows again to close it and see your result.
Not sure this is the right model? The General Sizing Tool compares every USG regulator and recommends one for your conditions.
Preliminary selection only. This tool provides a starting point based on the values entered and does not account for every variable in a field installation — including inlet pressure variation, ambient temperature, elevation, piping losses, venting requirements, over-pressure protection strategy, and applicable codes. Final regulator selection, installation and setting must be performed by qualified personnel in accordance with the product installation and maintenance manual and all applicable federal, state and local codes. Improper regulator selection or installation can result in over-pressurization, property damage, serious injury or death. Contact Holland Supply Company to review any selection before ordering.