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A valve assembly for use in heating, ventilating and air conditioning systems. The valve assembly includes a valve body having a chamber in which is rotatably mounted a quarter-turn flow control ball valve. A valve body nut having an outlet port is threadably mounted on the valve body adjacent the o

A valve assembly for use in heating, ventilating and air conditioning systems. The valve assembly includes a valve body having a chamber in which is rotatably mounted a quarter-turn flow control ball valve. A valve body nut having an outlet port is threadably mounted on the valve body adjacent the outlet end of the valve body chamber. A flow venturi is removably mounted in the inlet end of the valve body. A pipe union tailpiece is detachably mounted on the inlet end of the valve body. A pair of pressure/temperature readout ports are mounted on the valve body for use in determining the rate of fluid flow through the venturi. A vent plug is mounted on the valve body for venting air from the ball valve chamber.

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1. In a valve assembly, the combination comprising:(a) an elongated valve body (12) having an inlet end and an elongated inlet bore (40,42); (b) a flow venturi (62) removably mounted in said elongated inlet bore (40,42), and having an inlet end with an entrance throat passage (106) and an outlet end

1. In a valve assembly, the combination comprising:(a) an elongated valve body (12) having an inlet end and an elongated inlet bore (40,42); (b) a flow venturi (62) removably mounted in said elongated inlet bore (40,42), and having an inlet end with an entrance throat passage (106) and an outlet end with an exit passage 108; (c) a union tailpiece (44) detachably mounted on the inlet end of the valve body (12), by a union nut (56), and having an inlet port (58) formed therein; (d) said elongated valve body (12) having a ball valve chamber (26) formed therein, adjacent the venturi exit passage (108); (e) a quarter-turn ball valve (22) rotatably mounted in said ball valve chamber (26) for controlling the flow of fluid through the valve body (12); (f) a valve body nut (14) detachably mounted on the valve body (12), adjacent the ball valve chamber (26), and having an outlet port (20) formed therein; (g) a first pressure/temperature readout port (82) detachably mounted on said valve body (12); (h) a first readout passage (80) formed in the valve body (12) and communicating said first pressure/ temperature readout port (82) with said elongated inlet bore (42) adjacent the inlet end of the venturi (62); (i) a second pressure/temperature readout port (82a) detachably mounted on said valve body (12); (j) a second readout passage (80a) formed in the valve body (12) and communicating said second pressure/temperature readout port (82a) with passage means (102,104) in the venturi (62) which communicate with the venturi entrance throat passage (106); (k) control lever means (124) attached to said ball valve (22) for rotating the ball valve (22) between open and closed positions; and, (l) said pressure/temperature readout ports (82,82a) being adapted to allow pressure and temperature detecting instruments to be inserted throughout to provide the pressure and temperature differences of fluid flowing into the venturi (62) and the fluid flowing through the entrance throat passage (106) of the venturi (62), for determining the rate of flow of fluid through the ball valve (22) for setting the ball valve (22) in a selected open position.