Filter By
Connection Size






Operating Condition
Fluid
Steam Load  
Filter
O-Series (for Steam)

O-Series Regulator

The O-Series direct-operated pressure regulators with heavy duty cast iron bodies and internal strainer 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.

Controlling Pressure

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 diaphram 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.

Design Features

The O-Series contains hardened stainless steel seat and disc with a guided stem for extended service life. An internal strainer protects against dirt and scale.

A phosphor Bronze diaphragm (Model Code B) specifically designed for steam service is a preferred choice over a stainless steel diaphragm which are prone to work hardening. Phosphor Bronze diaphragms are for steam use only and may fracture if used on liquid service.

Viton diaphragms (Model code V) are specifically designed for water, air, or other liquid service and have a working temperature range up to 300ºF.

Pressure Adjustment Range

When selecting any regulator the proper control spring must be selected so the valve may be properly adjusted to the desired outlet pressure.

Our 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 flflexibility in downstream pressure adjustment depending on the application.

Other Considerations

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.

How To Size for O-Series

From the Capacity chart, find the inlet pressure and required regulator outlet pressure. Follow across chart to nearest capacity (steam, air, water) that meets or slightly exceeds demand requirements. Follow vertically up to determine appropriate size. When exact application values are not shown, interpolate between values. Select a model with the spring range that accommodates the required outlet set pressure.

Important Application Note:
  • Use Phosphor Bronze Diaphragms for Steam.
  • Use Viton diaphragms for Water, Air and Oil Applications.

Phosphor Bronze Diaphragms may fracture if used on Liquid Service. Use for Steam Only.

Notes:
HC Denotes High Capacity (3/4” size Only)

Diaphragm Code:
B - Phosphor Bronze

Example
Application: 200 lbs/hr of 100 PSIG Steam reduced to 30 PSIG

Model Code: O-12-N-14-B ( 1/2” O-Series, 10-50 PSIG spring range, NPT with Bronze Diaphragm for Steam)

Find the inlet pressure: 100 PSIG
Next find the required regulator outlet Pressure: 30 PSIG
Follow across to the nearest capacity (Steam) that meets or slightly exceeds demand requirements: 200 lbs/ hr (214)
Follow vertically up to determine appropriate size: 3/8”, 1/2”, 3/4”
To determine actual full model code see model code chart below


Steam: The O Series, with Cast Iron body and Hardened Stainless internals, is our most popular and economical solution for reducing pressure in systems.

Size Connection Inlet Pressure Range (PSIG) Max Capacity
3/8" - 2" NPT 15-250 2,141 lbs/hr.
ModelSizeTypeSpring TypeReduced Pressure Range (psig)Max Inlet Pressure (psig)Capacity (lb/h)
O-11-N-13-B3/8"NPTSingle0 - 10250
O-11-N-14-B3/8"NPTSingle10 - 50250
O-11-N-09-B3/8"NPTSingle40 - 100250
O-11-N-10-B3/8"NPTSingle100 - 200250
O-12-N-13-B1/2"NPTSingle0 - 10250
O-12-N-14-B1/2"NPTSingle10 - 50250
O-12-N-09-B1/2"NPTSingle40 - 100250
O-13-N-13-B3/4"NPTSingle0 - 10250
O-13-N-14-B3/4"NPTSingle10 - 50250
O-13-N-09-B3/4"NPTSingle40 - 100250
O-13-N-10-B3/4"NPTSingle100 - 200250
OHC-13-N-0003-B3/4"NPTSingle0 - 10250
OHC-13-N-0004-B3/4"NPTSingle10 - 30250
OHC-13-N-0005-B3/4"NPTSingle30 - 50250
OHC-13-N-0006-B3/4"NPTSingle40 - 85250
OHC-13-N-0708-B3/4"NPTDouble0 - 75250
OHC-13-N-0809-B3/4"NPTDouble30 - 130250
O-14-N-0008-B1"NPTSingle10 - 30250
O-14-N-0009-B1"NPTSingle30 - 50250
O-15-N-0809-B1 1/4"NPTDouble0 - 75250
O-16-N-0010-B1 1/2"NPTSingle30 - 50250
O-16-N-0011-B1 1/2"NPTSingle40 - 85250
O-17-N-0010-B2"NPTSingle30 - 50250
O-14-N-0007-B1"NPTSingle0 - 10250
O-15-N-0009-B1 1/4"NPTSingle30 - 50250
O-15-N-0010-B1 1/4"NPTSingle40 - 85250
O-16-N-0009-B1 1/2"NPTSingle10 - 30250
O-16-N-0910-B1 1/2"NPTDouble30 - 130250
O-17-N-0009-B2"NPTSingle10 - 30250
O-17-N-0011-B2"NPTSingle40 - 85250
O-17-N-0809-B2"NPTDouble0 - 75250
O-17-N-0910-B2"NPTDouble30 - 130250
O-14-N-0809-B1"NPTDouble0 - 75250
O-14-N-0910-B1"NPTDouble30 - 130250
O-15-N-0007-B1 1/4"NPTSingle0 - 10250
O-14-N-0010-B1"NPTSingle40 - 85250
O-15-N-0008-B1 1/4"NPTSingle10 - 30250
O-15-N-0910-B1 1/4"NPTDouble30 - 130250
O-16-N-0008-B1 1/2"NPTSingle0 - 10250
O-16-N-0809-B1 1/2"NPTDouble0 - 75250
O-17-N-0008-B2"NPTSingle0 - 10250
Product Overview
The O-Series direct-operated pressure regulators with heavy duty cast iron bodies and internal strainer 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.
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”
Selection / Sizing / Capacities
From the Capacity chart, find the inlet pressure and required regulator outlet pressure. Follow across chart to nearest capacity (steam, air, water) that meets or slightly exceeds demand requirements. Follow vertically up to determine appropriate size. When exact application values are not shown, interpolate between values. Select a model with the spring range that accommodates the required outlet set pressure.

Example:
Application: 200 lbs/hr of 100 PSIG Steam reduced to 30 PSIG
Model Code: O-12-N-14-B (1/2” O-Series, 10-50 PSIG spring range, NPT with Bronze Diaphragm for Steam)


** 3/4" HC is high-capacity version of standard 3/4" valve.

Dimension and Weights