The Honeywell D146M1040 is a differential pressure regulator with a 1-1/4” NPT.  It has a brass body with thermoplastic/stainless steel parts and an EPDM diaphragm.
Features:
The D146M is placed between the supply and return sides of the hydronic heating system.  The installation is easy by requiring no electrical hookup.
| Application | Heating Systems | 
|---|---|
| Outlet Pressure Adjustment Range | 0-17 psi | 
| Maximum Inlet Pressure | 85 psi | 
| Diaphragm Material | EPDM | 
| Body Material | Brass | 
| Maximum Operating Temperature | 110°C (230°F) | 
| Capacity | 395,000 Btu/hr | 
| Pipe Size | 1-1/4" NPT (DN32) | 
| Valve Type | Pressure Regulating Valve | 
| Flow Rate | 50 gpm | 
Download Product Information:
Honeywell D146M Differential Pressure Control Valve Data Sheet
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