Throttling Gate Valves (H-340-B)

Hilton Throttling Knife Gate Valves are used primarily for free water discharge and flow control on dams and reservoirs. Bonneted throttling knife gate valves specifically designed for this service offer an economical option for low-head applications up to 230 feet of head (70 meters), or 100 psi (690 kPa). They are less expensive than valves designed for high head applications (over 100 psi, 690 kpa) such as jet flow gates and fixed cone valves.

Throttling valves are used on the outlet of dams to regulate the release of water for level control. The primary objective of this type of valve is free discharge of water into the atmosphere, often under a high differential pressure. Most valves are not suitable for free discharge service.

The valve includes some of the features of the Jet Flow Gate with a unique design that allows the valve to open smoothly in free discharge conditions, where there is pressure on the upstream side and zero pressure on the downstream side. UHMW guides are located on the downstream side of the gate to provide full support throughout the entire length of travel. Downstream side of the valve is larger than the upstream side which serves to resist damage from cavitation and vibration.

The H-340-B bonneted throttling knife gate valve is accepted for this application by the U.S. Bureau of Reclamation and many municipal water districts. The H-340-B bonneted throttling knife gate valve has been installed and is operating successfully at many facilities around the U.S.