Rising stem valve

A rising stem valve, comprising:

• a hollow valve body having a pair of ports defining a flow path through the valve body, a flange base through which one of the ports extends, and a valve bonnet opposite the flange base;
• a plunger/seal assembly extendable within the valve body to a first position in which the port in the flange base is sealed and to a second position for unsealing the port in the flange base, the plunger/seal assembly including a valve stem;
• a locking mechanism for securing the plunger/seal assembly in the first position, the locking mechanism including at least one cam lever attached to the valve body and a corresponding groove in the valve stem
• the valve stem has a plunger at one end thereof for engaging the flange base to seal the port in the flange base when the plunger/seal assembly is extended to said first position;
• an opposite end of the valve stem extends through a hub in the valve bonnet and has a handle fixed thereto at a location spaced from the valve bonnet and exterior of the valve body;
• the groove is a circumferential groove on the valve stem at a location exterior of the valve body and between the handle and hub of the valve bonnet;
• and
• the at least one cam lever is secured to the hub of the valve bonnet with a cam lever pin about which the cam lever is able to be pivoted to lock the plunger/seal assembly in the first position and to unlock the plunger/seal assembly from the first position.