Opening degree detection device for automatically operated valve

An opening degree detection device for an automatically operated valve having a fluid flow path formed in a valve body that is opened or closed due to the movement of a valve stem caused by an operation of an actuator, the opening degree detection device comprising:

• a base member which is detachably mounted on the automatically operated valve;
• a displacement sensor which is moved along with the valve stem;
• and
• a target having an inclined detection surface which is detected by the displacement sensor,
• wherein:
• the displacement sensor is supported on the valve stem by way of a sensor support member,
• the sensor support member is supported on the base member by way of a guide means;
• the guide means includes:
• at least one guide shaft which is mounted on the base member in an erected manner;
• and at least one guide shaft insertion hole which is formed in the sensor support member, and allows each guide shaft to pass therethrough;
• the sensor support member is integrally moved with the valve stem by being guided by the guide shaft;
• the target is fixed to the base member;
• the displacement sensor is movably supported on the base member;
• at least one cylindrical linear bushing guides each guide shaft is inserted into the at least one guide shaft insertion hole formed in the sensor support member;
• and
• a compression coil spring which biases the sensor support member downward is fitted on the guide shaft.

An opening degree detection device for an automatically operated valve which is installed in an automatically operated valve where a fluid flow path formed in a valve body is opened or closed due to the movement of a valve stem caused by an operation of an actuator, wherein

• the opening degree detection device comprising:
• a base member which is detachably mounted on the automatically operated valve;
• a displacement sensor which is moved along with the valve stem;
• and a target having an inclined detection surface which is detected by the displacement sensor, wherein the target is fixed to the base member, and the displacement sensor is movably supported on the base member,
• wherein the automatically operated valve is an automatically operated valve which uses a resin-made diaphragm as a valve element, and includes a valve element exchange timing determination means which obtains a change with time of an output signal of the displacement sensor at a fully closed position of the fluid flow path, and informs the arrival of exchange timing of the resin-made diaphragm when a value of the output signal exceeds a predetermined value.