Description
Watson McDaniel DL Series — Dome-Loaded Pressure Regulators
The DL Series Dome-Loaded Regulators are designed for precise steam pressure control in industrial and process steam systems. Unlike spring-loaded regulators, these valves use a pressure dome that is adjusted by air or gas pressure, allowing smooth and accurate control of downstream steam pressure. Ideal for installations requiring remote adjustment or where reduced maintenance and fast response are needed.
Product Overview
- Maintains constant downstream pressure using a dome-loaded control mechanism
- Allows remote pressure adjustment via air supply (using control panels such as PL1, PL2, or PL3)
- Available in ductile iron, carbon steel, or stainless steel construction
- Compact design with high capacity and quick response
- Commonly used in steam distribution, process heating, and condensate systems
Technical Specifications
- Body Material: DLDI — Ductile Iron; DLCS — Carbon Steel; DLSS — Stainless Steel
- Maximum Operating Pressure: 450 PSIG
- Connection Types: NPT or ANSI Flanged (150# and 300#)
- Adjustment: Dome-loaded via external air regulator or control panel
- Applications: Steam pressure control, reducing stations, and clean steam systems
Available Models
| Size / Connection | Model Code (DLDI) | Model Code (DLCS) | Model Code (DLSS) | Weight (lb) |
|---|---|---|---|---|
| 1/2″ NPT | DLDL-12-N | – | – | 24 |
| 3/4″ NPT | DLDL-13-N | – | – | 24 |
| 1″ NPT | DLDL-14-N | – | – | 30 |
| 1″ 150# FLG | DLDL-14-F150 | DLCS-14-F150 | DLSS-14-F150 | 31 |
| 1″ 300# FLG | DLDL-14-F300 | DLCS-14-F300 | DLSS-14-F300 | 32 |
| 1¼″ NPT | DLDL-15-N | – | – | 50 |
| 1½″ NPT | DLDL-16-N | – | – | 51 |
| 1½″ 150# FLG | DLDL-16-F150 | DLCS-16-F150 | DLSS-16-F150 | 60 |
| 1½″ 300# FLG | DLDL-16-F300 | DLCS-16-F300 | DLSS-16-F300 | 64 |
| 2″ NPT | DLDL-17-N | – | – | 90 |
| 2″ 150# FLG | DLDL-17-F150 | DLCS-17-F150 | DLSS-17-F150 | 87 |
| 2″ 300# FLG | DLDL-17-F300 | DLCS-17-F300 | DLSS-17-F300 | 90 |
| 2½″ 150# FLG | DLDL-18-F150 | – | – | 105 |
| 2½″ 300# FLG | DLDL-18-F300 | – | – | 107 |
| 3″ 150# FLG | DLDL-19-F150 | DLCS-19-F150 | DLSS-19-F150 | 170 |
| 3″ 300# FLG | DLDL-19-F300 | DLCS-19-F300 | DLSS-19-F300 | 175 |
| 4″ 150# FLG | DLDL-20-F150 | DLCS-20-F150 | DLSS-20-F150 | 230 |
| 4″ 300# FLG | DLDL-20-F300 | DLCS-20-F300 | DLSS-20-F300 | 250 |
Features & Benefits
- Allows remote pressure adjustment using air supply regulators or PL control panels
- High-accuracy dome-loaded operation ensures stable downstream pressure
- Available in ductile iron (DLDI), carbon steel (DLCS), or stainless steel (DLSS)
- Compact and reliable design minimizes maintenance requirements
Note: The DL Series Dome-Loaded Regulators are used with external air control panels (PL1, PL2, or PL3) for pressure adjustment. Not standalone control valves.