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PCE
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DIFF Subgroup
F16K 1/40

of helical shape

Introduced: September 1968

Full Title

Full titles differ between systems:

IPC:

Lift valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces > Details > Cutting-off parts > Valve members > of helical shape

CPC:

Lift valves , i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces ( ; diaphragm valves F16K7/00) > Details (details of more general applicability F16K25/00 - F16K51/00) > Cutting-off parts, e.g. valve members, seats (F16K1/06, F16K1/12, F16K1/14, F16K1/26 take precedence) > Valve members (for double-seat valves F16K1/44 ) > of helical shape

No child classifications to compare. This is a leaf node in both IPC and CPC.