ANSI Valves

The team at Baelz North America is proud to offer two ANSI ISA-certified control valves — the two-way ANSI 365 and the three-way ANSI 367.

To meet clients’ specific application needs, we keep a wide variety of ANSI valve sizes in stock and available for immediate purchase in 150# and 300# pressure classes. Larger valves and some additional sizes are available through special order.ANSI Valves

What are ANSI Valves?

The American National Standards Institute (ANSI) sets rules and guidelines regarding the most critical technical aspects of various components manufactured for industrial use in North America. All ANSI-compliant Baelz valves are also compliant with ISA specifications. This is due to the International Society of Automation’s (ISA) reaffirmation of existing ISA valve-related standards, which include ANSI valve standards. 

As such, any ANSI-certified valve from Baelz may be used in any North American industrial flow control operation. Producing valves according to ANSI valve standards means adhering to a comprehensive set of rules that affect a valve’s most important characteristics, including:

  • Connection types and dimensions
  • Valve sizing
  • Pressure ratings
  • Markings
  • Tag positions
  • Factory testing procedures
  • Casting and Materials

ANSI Valves eBook

Three-Way ANSI 367

3 Way ANSI Valve

Two-Way ANSI 365

ANSI 365 Valve

ANSI Certified Valves Features

Our ANSI ISA/ASME-certified valves feature ANSI standard-size flanges, with standard face-to-face dimensions. With these new ANSI valves, users can bolt right up without the use of DIN mating flanges or companion flanges for ANSI piping.

As mentioned earlier, the new models 365 and 367 ANSI ISA-certified valves are available in 150# and 300# valve pressure classes, and are used within a wide range of applications, including those involving:

  • Hot oil
  • Steam
  • Water
  • Energy

Baelz ANSI valves are available in two different configurations:

Stainless Steel Bellows Valve With Cooling Tube


  • These valves are designed for use in higher temperature ranges, with a maximum temperature of 343 ºC, or 650 ºF.
  • These stainless steel components allow for extended life spans of the valves seals and can handle 150,000 reps up and down at 300 ºC.

Non-Bellows Seal Valves


  • These valves have a maximum temperature of 232 ºC, or 450 ºF.
  • This model does not feature the stainless-steel bellows or extended cooling tubes as mentioned in the previous model.

Click to view our ANSI Valves infographic

ANSI Valve Standards: Sizing

All ANSI-certified valves follow standard specifications regarding sizing, such as: 

  • Flange dimensions
  • Face-to-face dimensions
  • Flange bolt patterns (for connection to ANSI standard piping)
  • Pressure requirements
  • Valve body material 

Each of these valve sizing aspects must be in American standard measurements (inches, psi).

ANSI Valve Standards: Factory Testing

The structural integrity of every Baelz ANSI-certified valve is factory tested to ensure durability and leak proof, according to the stringent testing requirements defined by ANSI.

The valves are tested with a liquid that may consist of water, water with an added corrosion inhibitor, or other approved liquids with similar specific gravity. Pressure and time testing parameters are dependent on the type of material the valve is constructed from, nominal valve size, and the valve’s classification.

In order to pass all tests, a valve needs to:

  • Display no visible leaks on the valve body during the hydro testing process
  • Allow no leaks at the flanges, the stem, or any other part of the valve that must hold pressure.
  • Valve function has no impairment during testing

ANSI Valve Standards: Tag Placement / Marking

The ability to identify a valve’s specification is crucial in the industrial field. Such information may include:

  • Manufacturer
  • Materials of construction
  • Nominal diameter
  • Pressure rating designation
  • All internal components

A valve tag that is visible to help identify this information is very valuable during maintenance, upgrade, replacement, or when taking count of equipment inventory. For this reason, ANSI requires the placement of valve identification tags on the face of the b-port flange.

Benefits of ANSI/ISA Certification

Using ANSI-certified valves ensures that every valve will support the required temperature, flow, and pressures. Valve standardization also means that valves are easily replaced, or that repairs and upgrades can be performed with limited delay and downtime.

ANSI Certified Valves from Baelz North America

To learn more about our new ANSI ISA-certified valves, download the technical guides for the 365 and 367 valves. And for more information on Baelz valve offerings, or to discuss your options with an expert, contact the team today.

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