Patent ID: 11931500
Assignee: NIKKISO COMPANY LIMITED
Field: Measurement (Instruments)
Classification: CPC A  G | IPC A  G

Claim 0:
1. A pressure detector comprising:
a case comprising:
a liquid-phase-portion-case and
a gas-phase-portion-case, wherein the case is connectable to a flow route for liquid, and

a membrane member provided in the case between the liquid-phase-portion-case and the gas-phase-portion-case so that the membrane member separates a liquid-phase portion to be supplied with the liquid in the flow route and a gas-phase portion to be supplied with gas, the membrane member being displaceable in accordance with a pressure of the liquid supplied to the liquid-phase portion,
the pressure detector detecting the pressure of the liquid in the flow route by detecting a pressure in the gas-phase portion,
wherein the gas-phase-portion-case has an opening through which the gas is allowed to be introduced or discharged in accordance with displacement of the membrane member, and a secured portion secured for introduction or discharge of the gas through the opening during the displacement of the membrane member towards the gas-phase-portion-case; and
wherein the secured portion consist of recesses surrounding the opening and ribs formed in the recesses around the opening;
wherein the gas-phase-portion-case has a bottom wall and the secured portion is formed in the bottom wall and a top of the bottom wall and a top of the ribs are coplanar and the ribs extend into the secured portion so that the recesses are formed along the ribs; and
wherein the membrane member, when moved into a state where the membrane member is displaced towards the gas-phase portion, contacts the ribs so that the recesses provide spaces that allow the gas to flow through the opening.