The Fixed Cone valve is a Free Discharge valve, it is also known as Howell Bunger ® and Hollow Jet valves. These valves are used to discharge water at high pressure from reservoirs or full pipes into atmosphere. Some designed valves can also work submerged in the water.

The flow towards the exit of the valve is not converging so that the discharge is in the shape of a hollow jet. A major air area contact with the water spray reduces the kinetic energy of water.

The hollow jet valve is designed to dissipate huge amount of energy without cavitation and vibration.

A hood can be incorporated at the end of the valve in order to reduce the risk of erosion from the water jet against the immediate environment.
Submerged valves need a special profile chamber to avoid hydraulic instabilities.

The body of the fixed cone valve is a tube with a cone in the end welded with some vanes.
Another tube acts as the closure member. This slides over the body vanes in a linear movement to regulate until making contact against the seat of the cone when the valve is fully closed.

General features and ranges for Fixed Cone Valves

Diameter range: From 6" to 108". Coefficient of Discharge with valve full-open: 0,85 0,75 with hood Flanges Connection to the pipe: From DIN PN 2.5 to 16, AWA C207 class "D", 4504/4772 Actuation: Manual, electric actuator, hydraulic by double effect cylinders. Typical applications: Regulation and discharge of reservoirs, Regulation valve for consume, Energy disipation to the end of pipes.

Standards for Fixed Cone Valves

TR HL-81-4
Fixed-Cone Valves, New Melones Dam California

ANSI/ISA 75.08.04-2001
Fixed-Cone Valves, New Melones Dam California