Valve with handle latch/lock

A valve assembly comprising:

• a valve body defining a valve chamber having inlet and outlet ports connected therewith;
• a rotary valve element mounted in said chamber for controlling flow between the inlet and outlet ports;
• a bonnet member;
• an operating stem extending from the valve element to a position externally of the body;
• a handle assembly joined to the operating stem for rotating the stem between selected positions, the assembly including a handle body defining a first guide slot extending transversely of the stem and a second guide slot extending generally in the direction of the stem, a first operating member mounted for sliding movement in the first guide slot, spring means biasing the first member in a first direction toward a first position, a second operating member carrying a downwardly extending latch pin adapted for selective engagement with the body, said second operating member being guided for sliding movement in the second slot and cam means interconnecting said first and second operating members such that movement of the first operating member in a direction opposite to the first directions toward a second position produces upward movement of the second operating member and the latch pin to disengage the latch pin from the valve body.