Ficed Cone Valves
Fixed Cone valve is a free discharge valve whose control of flow rate is very simple and easy regardless of the magnitude of the water head. The valve is used for extra water discharge at dams and reservoirs, flow control of downstream agricultural water, protection discharge of hydraulic turbine or distributing reservoir water. The streamline shape at discharge is distributed into a conical shape and the energy of the fluid gets very weak, and therefore there is no harm to any object in the way of discharged water. Additionally, if discharge in a distributed status is not appropriate, discharge can be performed in a parallel jet status by attaching a cylindric hood at the downstream of the body or inside the water. This means that it is classified and used as an in-air discharge type and an in-water discharge type.
Features
1. There is a big attenuation effect with regard to the fluid.
2. Actuating force is very small as the force applied on the valve is balanced.
3. Since the discharge coefficient is big, the valve diameter gets smaller and the conduit line can be designed with a small
diameter as well.
4. Operation is smooth at any opening angle and adjustment of minimal flow rate is also possible.
5. Maintenance and checking are very convenient as the moving part is installed outside of the main body of the valve.
6. The product is as robust as the structure is simple.
Drive Method
Manual, motor driven and hydraulic method
Structure AND Material
The structure: The valve is connected to the upstream of the water conduction line, while the other side is connected with the radial rib in a cone shape. The cylindric gate slides around the circumference of the body and driving device. The body and gate are in a general welding structure and the seat part is in a stainless steel plate material or a copper material welding overlay. The main body and the sliding part of the gate is made of a welding overlay of stainless steel. And opening and closing of the valve is done by sliding the gate upstream and downstream of the main body. This driving part transfers the torque of the drive shaft to Bevel Gear, Worm Gear and Screw and moves the gate to the front and rear along the nuts fixed on the gate. Hydraulic drive is also possible by attaching servo cylinders on both sides of the main body.
Selection of the Size
Dam Discharge Valve
Howellbunger Valve(Cone Valve)
ㆍ Nominal diameter - 200 ~ 2700mm
ㆍ Pressure - 2.94Mpa (30㎏/㎠)
ㆍ Major material - Body : SS400, SM450
Gate : SS400, SM400
Spindle : SUS403
Seat : SS400 + SUS304 welding overlay
※ Installed on a round cross section and downstream of the pipe mainly for high dam discharge, and the flow is controlled by the movement of the gate after installing a 90˚ cone in the center.
The actuating force of the gate is very small and the transfer power to open and close the gate is almost constant during the entire stroke.
Jet Flow Gate
ㆍ Nominal diameter - 250 ~ 1500mm
ㆍ Pressure - 0.98Mpa (10㎏/㎠)
ㆍ Major materia - Body : SM450, SS400
Gate : SUS304, SS400
Spindle : SUS304, SUS403
Seat : ALBC
※ Used in the medium position such as discharge line, etc., this is a gate that controls the flow of the high head. Since the jet flow following the seat ring gets distributed and discharged through the gate slot, the cavitation characteristic is excellent.
Hollow Jet Valve
ㆍ Nominal diameter - 250 ~ 2000mm
ㆍ Pressure - 2.94Mpa (30㎏/㎠)
ㆍ Major materials - Body : SC450, SS400
Needle : SC450, SS400
※ The valve is for the control of the flow for high heads. The flow is adjusted through the regulation of the gap between the body and the needle. The discharge is effected with a lot of air mixed inside.
There is no vibration caused by the discharge and the fine tuning of the flow is possible throughout the opening of the valve.
Cone-Sleeve Valve
ㆍ Nominal diameter - 300 ~ 1600mm
ㆍ Pressure - 0.98Mpa (10㎏/㎠)
ㆍ Major materials - Body): SUS304L Sleeve : SS400
※The valve attenuates by absorbing the discharged energy that rapidly propagates inside the vertical attenuation tank. There are a lot of benefits such as its compact size, light weight, the rational structure of the valve itself, its simplicity, etc.
derived from its vertical attenuation tank characteristic.
Guide Valve
Nominal dia : 500 ~ 3000mm
Pressure : 1.47Mpa (15㎏/㎠)
Main material : Body/Gate--Steel Plate (SS400 SM400)
Spindle--Stainless Steel (STS304)
Seat--Bronze Casting (BC6)
※ Fixed at the discharge pipe of a dam, mainly used as the guide
valve of a discharge valve.
Spring Type Large Diameter Air Valve
Nominal dia : 300 ~ 600mm
Pressure : 1.96Mpa (20㎏/㎠)
Main material : Body/Disk--Steel Casting (SC450)
Spindle--Stainless Steel (STS304)
Seat--Bronze Casting (BC6) Rubber
※ For PENSTOCK at an hydrothermal power plant. Anti-freezing heater
is attached as a component.
Hydraulic Turbine Inlet Valve
Nominal dia : 500 ~ 3000mm
Pressure : 0.98Mpa (10㎏/㎠)
Main material : Body/Disk--Steel Plate (SS400, SM400)
Spindle--Stainless Steel (STS304)
Seat--Bronze Casting (BC6)
※ Fixed at the discharge pipe of a dam, mainly used as the guide valve of a discharge
valve.
Ring Follover Gate
Nominal dia : 500 ~ 2500mm
Pressure : 0.98Mpa (10㎏/㎠)
Main material : Body/Disk--Steel Plate (SS400 SM400)
Spindle--Stainless Steel (STS304)
Seat--Bronze Casting (BC6)
※ As the flow is guided through the round leaf that has the same diameter as the
plumbing when fully open shut, large quantity discharging is easily possible.
No draining device and less additional equipment are needed thanks to its
structure.
