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Does my system need h-piece and lockshield valves?

Discuss Does my system need h-piece and lockshield valves? in the Plumbing Jobs | The Job-board area at PlumbersForums.net

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Hello

2 storey building
3 apartments per floor

Waterborne heating system description:
Each apartment has separate heating distribution manifold cabinet.
Manifold based distribution system where each panel is served by its own circuit.
STAD valve in the second floor manifold cabinet for the return line.
Pex pipes
Purmo Ventil Compact CV11-400-1200 + Danfoss RA 2977
Purmo Ventil Compact CV21-600-500 + Danfoss RA 2977
Purmo Ventil Compact CV22-400-1400 + Danfoss RA 2977
Purmo Ventil Compact CV21-400-1200 + Danfoss RA 2977
Purmo Ventil Compact CV33-600-400 + Danfoss RA 2977
Purmo Compact C22-900-500 + Danfoss RA-N + Danfoss RA 2977

My question is, do i need h-piece valves for the bottom connection ventil compact radiators and a lockshield valve for compact radiator?

Thank you
 

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