Description
The Watson McDaniel O-15-N-0910-B Pressure Regulating Valve, part of the O-Series, is a direct-operated pressure regulator with a heavy-duty cast-iron body and internal strainer. They are suitable for a wide range of applications in the low-to-moderate flow range. Applications include small heaters, humidifiers, various hospital equipment, tire molds, as well as many other general uses. This style of regulator does not require an external sensing line. Set pressure is controlled by turning an adjustment screw with lock nut that increases or decreases spring force above the diaphragm. Several spring ranges are available, depending upon the downstream pressure that needs to be maintained. O-Series contains hardened stainless-steel seat and disc for extended service life. Phosphor Bronze Diaphragm specifically designed for Steam service is considered a preferred choice over Stainless Steel diaphragms which are prone to work-hardening and potential cracking. Viton diaphragms are specifically designed for water, air, gases and other liquid service and have a working temperature range up to 300°F.
The O-Series valve reduces downstream pressure of steam, water, or gas. Downstream pressure is set by turning an adjustment screw that increases or decreases spring force above a diaphragm. The downstream pressure applies an upward force to the diaphragm to compress the adjustment spring. When the system pressure equals the set point, the diaphragm moves upward against the adjustment spring force, closing the valve. When selecting any regulator, the proper control spring must be selected so the valve may be properly adjusted to the desired outlet pressure.
The smallest size O-Valves (3/8”- 3/4“ size) have four distinct overlapping pressure ranges. The larger size O-valves, which include the 3/4 -HC thru the 2” bodies have four distinct pressure range when using the SINGLE spring option and two wider pressure ranges when using the DOUBLE spring option. The double spring option gives the user added flexibility in downstream pressure adjustment depending on the application.
The limitation of the direct-operated type regulator is a variation of up to 10% of initial set pressure depending on changes in flow through the valve. As flow requirements through the valve increase, the outlet set pressure will tend to decrease.
For example; Inlet pressure is 100 PSIG and downstream pressure is adjusted to maintain 50 PSIG while 250 lbs/hr of steam flows through the valve. If the steam flow rate happens to increase to 500 lbs/hr, then the outlet pressure would drop to 45 PSIG.
Features
- Hardened stainless steel seat and disc for extended service life (55 Rc)
- Phosphor Bronze diaphragm for Steam Service
- Viton diaphragm for up to 300ºF for Water, Oil & Air Service
- Double spring available for extended outlet pressure range
- Integral stainless-steel strainer on 3/4” HC, 1”, 1-1/4”, 1-1/2” & 2”
Specifications
- Model – Watson McDaniel O-15-N-0910-B
- Service – Steam
- Size – 1.25″
- Connection – NPT
- Reduced Pressure Range (psig) – 0-75
- Max. Inlet Pressure (psig) – 250
- Min. Inlet Pressure (psig) – 15
- Max. Differential Pressure (psig) – 125
- Min. Differential Pressure (psig) – 15
- Body – Cast Iron
- Seat – Hardened 420 Stainless Steel
- Disc – Hardened 420 Stainless Steel
- Diaphragm – Phosphor Bronze, Double Spring
- Weight – 22lbs
- Dimensions – (4.5×4.5×13)
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