Dual Assemblies
ASHRAE 15 and IIAR 2 compliant dual valve assemblies
Two ASME-certified relief valves combined with a 3-way cast manifold to meet ASHRAE 15 and IIAR 2 requirements. The handwheel allows either relief valve to be isolated and replaced while the system remains pressurized and protected — eliminating the need for system shutdown.
ASHRAE 15 compliantIIAR 2 compliantHandwheel changeover designNo system shutdown required
Compare the Family
Dual Assemblies at a glance
843 Dual AssemblyView specs
- Base Manifold
- 843 Manifold
- Configuration
- Two relief valves on a three-way changeover manifold
844 Dual AssemblyView specs
- Base Manifold
- 844 Manifold
- Configuration
- Two relief valves on a three-way changeover manifold
845 Dual AssemblyView specs
- Base Manifold
- 845 Manifold
- Configuration
- Two relief valves on a three-way changeover manifold
| Specification | 843 Dual AssemblyView specs | 844 Dual AssemblyView specs | 845 Dual AssemblyView specs |
|---|---|---|---|
| Base Manifold | 843 Manifold | 844 Manifold | 845 Manifold |
| Configuration | Two relief valves on a three-way changeover manifold | Two relief valves on a three-way changeover manifold | Two relief valves on a three-way changeover manifold |
Why Cyrus Shank
Every dual assembly is built the same way
ASME Certified Quality
Manufactured and documented to meet inspection and code requirements.
Custom Set Pressures
Factory-set to your exact specification at no additional charge.
100% Bench Tested
Every valve is individually tested before leaving the factory.
American-Made
Precision-machined in Chicagoland since 1912.
Where It's Used
Dual Assemblies for demanding refrigeration systems
Frequently Asked Questions