Dual Assemblies
843 Dual Assembly
The 843 Dual Assembly pairs two safety relief valves on a 843 three-way changeover manifold, so one valve can be isolated and serviced while the other keeps the vessel continuously protected.
- Base Manifold
- 843 Manifold
- Configuration
- Two relief valves on a three-way changeover manifold
ASME Certified
UV & NB stamped
100% Tested
Every valve, every time
American Made
Manufactured since 1912
Specifications & Details
The 843 Dual Assembly combines two Cyrus Shank safety relief valves mounted on a 843 three-way changeover manifold. The changeover manifold allows one relief valve to remain in service and fully protect the pressure vessel while the second valve is isolated for testing, replacement or recertification — eliminating the need to shut the system down for valve maintenance.
Why a dual assembly
- Continuous over-pressure protection during valve service or recertification
- No system shutdown required to change or test a relief valve
- Built on the proven Cyrus Shank 843 manifold platform
Relief valve models, set pressures and connection sizes are configured to your application. Request a quote and our team will help specify the correct dual assembly.