Malfunction Prevention Manual Valve

A malfunction prevention manual valve including:

• a handle rotatable for operating opening and closing of the valve;
• a rod threaded in a housing in such a manner as to be movable in a vertical direction along a rotation axis of the handle;
• a power transmitting mechanism for transmitting rotation of the handle to the rod to cause the rod to move threadedly in the vertical direction;
• a valve section arranged to bring a valve element into and out of contact with a valve seat in association with vertical movement of the rod;
• and
• a lock mechanism for restraining the handle from rotating;
• wherein the lock mechanism includes:
• a rotation stopper member held against rotation relative to the housing;
• a cam groove formed in the handle, in which the rotation stopper member is engaged;
• and
• the power transmitting mechanism arranged to be integral with the handle and be urged by an urging member.

A malfunction prevention manual valve including:

• a handle rotatable for operating opening and closing of the valve;
• a rod movable in a vertical direction along a rotation axis of the handle;
• a power transmitting mechanism for transmitting rotation of the handle to the rod by converting the rotation to vertical movement;
• a valve section arranged to bring a valve element into and out of contact with a valve seat in association with the vertical movement of the rod;
• and
• a lock mechanism for restraining the handle from rotating;
• wherein the lock mechanism includes a rotation stopper member held against rotation relative to the housing and an engagement member provided in the handle in such a manner as to be engageable with the rotation stopper member, and
• the lock mechanism is arranged to maintain a locked state in which the handle is restrained from rotating when one of the rotation stopper member and the engagement member is urged by an urging member and the engagement member engages with the rotation stopper member.

A malfunction prevention manual valve including:

• a handle rotatable for operating opening and closing of the valve;
• a rod movable in a vertical direction along a rotation axis of the handle;
• a power transmitting mechanism for transmitting rotation of the handle to the rod by converting the rotation to vertical movement;
• and
• a valve section arranged to bring a valve element into and out of contact with a valve seat in association with the vertical movement of the rod;
• wherein the handle is a plate shape pivoted on the rod protruding from an upper surface of the housing by a pin diametrically extending through the rod.