Hammel Dahl and Koso Hammel Dahl control valves have been utilized in the nuclear power industry for several decades. These valves have been provided for BWR’s, PWR’s, and PHWR’s worldwide since the late 1960’s. A partial list of applications includes the following:
- PWR Primary Reactor System Sampling Valves
- BWR Control Rod Drive System Scram Valves (CRD Valves)
- BWR Control Rod Drive System Flow Control Valves
- Chemical Volume Control
- Heater Drains
- Main Steam Dump Valves
- Reactor Water Clean-up (RWCU) System Flow Control
- Service Water Flow Control
- BWR Primary Recirculation System Flow Control

Frequently Asked Questions
What nuclear power applications use Hammel Dahl and Koso Hammel Dahl control valves?
Hammel Dahl and Koso Hammel Dahl valves have been used in numerous nuclear applications, including reactor sampling, BWR control rod drive systems, chemical volume control, heater drains, main steam dump service, RWCU systems, service water, and reactor recirculation flow control.
Are Hammel Dahl valves used in both BWR and PWR nuclear plants?
Yes. Hammel Dahl control valve products have a history of applications in Boiling Water Reactors and Pressurized Water Reactors, as well as other reactor designs worldwide.
Are Hammel Dahl valves used in BWR Control Rod Drive systems?
Yes. Hammel Dahl CRD Scram Valves and flow-control valves have been used in Boiling Water Reactor Control Rod Drive systems.
Are Hammel Dahl valves used for nuclear reactor sampling?
Yes. Hammel Dahl nuclear sampling valves have been applied to sampling duties in nuclear systems, including PWR primary reactor system sampling applications.
Can Koso Hammel Dahl valves be used in Reactor Water Cleanup systems?
Hammel Dahl equipment has been used for Reactor Water Cleanup, or RWCU, system flow-control applications. WTM also has experience with engineered trim modifications for certain original Hammel Dahl RWCU valves.
Does WTM support valves used in service water and recirculation systems?
Yes. Supported applications include service-water flow control and BWR primary recirculation system flow control, among other nuclear plant applications.
Can WTM evaluate a valve for a nuclear application not listed on the website?
Yes. The applications listed by WTM represent only part of the installed application base. Customers can provide system conditions, valve specifications, drawings, model information, and performance requirements for technical review.

