1500# Bellows-Sealed Design

The Hammel Dahl Nuclear Sampling Valve is primarily intended for PWR applications requiring a bellows seal design.  However, its compact/light weight design makes it an excellent choice for nuclear plant sampling valve applications wherever spatial constraints and/or weight limitations exist.

For a specification sheet, click here.

Primary features and benefits include:

  • Provided to ASME Section III, Class 1 requirements
  • Compact piston actuator and body design for installation in areas with tight spatial constraints.
  • Bellows-Sealed for PWR primary system applications.
  • Secondary graphite packing provides back-up sealing in unlikely event of a bellows leak.
  • Extremely short stroke to facilitate small sample requirements.
  • Extremely short stroke permits the use of compact limit switches, reducing envelope size and weight (limit switches available as an option)
  • Enhanced bellows design and material (Inconel 750) to provide extended service life without bellows failure.
  • High closing thrust to assure positive shut-off.
  • Hermetically-sealed body to bonnet joint to eliminate any external leakage that is characteristic of bolted-bonnet designs.
  • Hardfaced seat and plug seating surfaces, precluding need for frequent servicing of valve to replace or renew seating surfaces.
  • One-Piece Plug and Stem, simplifying design.
  • Rugged construction designed to satisfy typical nuclear plant seismic requirements.
  • Radiation-resistant piston seal materials
  • Refined design based on decades of operating experience.

Frequently Asked Questions

What are Hammel Dahl nuclear sampling valves used for?

Hammel Dahl nuclear sampling valves are designed for sampling applications within nuclear power plant systems, including applications associated with primary reactor systems where reliable isolation and controlled sampling are required.

What design features are used in Hammel Dahl nuclear sampling valves?

Features can include high closing thrust, a hermetically sealed body-to-bonnet joint, hardfaced seating surfaces, a one-piece plug and stem, rugged construction, and seal materials selected for demanding nuclear service.

How does the hermetically sealed body-to-bonnet design help?

The hermetically sealed joint is designed to eliminate the external leakage path commonly associated with conventional bolted-bonnet connections, making it beneficial for demanding sampling applications.

Are Hammel Dahl sampling valves designed for nuclear plant environments?

Yes. These valves were developed for nuclear service and incorporate design features intended for demanding plant environments, including rugged construction and materials appropriate to the specified application.

Does WTM provide replacement parts for Hammel Dahl nuclear sampling valves?

WTM supports installed Hammel Dahl equipment and can assist with appropriate OEM replacement parts, technical documentation, equipment identification, and replacement requirements for supported sampling valve designs.

Can WTM help identify an existing Hammel Dahl sampling valve?

Yes. Providing the valve model number, tag number, nameplate information, drawings, photographs, system application, and other available documentation can help WTM identify the valve and determine the appropriate support options.

Can WTM provide technical support for nuclear sampling valve applications?

Yes. WTM provides engineering and technical support for Hammel Dahl and Koso Hammel Dahl products and can assist with product identification, parts, application questions, maintenance information, and replacement solutions.