The Spherical Valves are mainly employed in power plants or dams where both water high pressure is involved and the need for high performance for low head losses and leak tightness exists. A common application is ‘turbine protection’, where the valve acts both as safety and maintenance device.
An important feature of a spherical valve is the ‘double seal system,’ consisting of both maintenance and service stainless steel seals. This sealing system enables the penstock to remain pressurised when maintenance operations are being undertaken on the downstream side of the valve.
The Spherical Valves are manufactured with the combination of steel plates and forged components. Vortex Hydra, as part of their design criteria, normally recommend the grade of steel to be used, but any special request from the customer can be analysed and agreed on.
The operational system of the gates can consist of the following:
• Cylinder with counter weight (the cylinder can be actuated by either hydraulics or high pressure water).
• Electric motorised gearbox
• Special operational system defined and agreed with the customer
A typical range of applications are:
• Diameter up to DN3000
• Pressure up to PN160
Sealing System: stainless steel seated in stainless steel operated by a dedicated hydraulic circuit.
All phases of the engineering design and fabrication through to final testing are undertaken by Vortex Hydra in compliance with UNI EN ISO 9001 Quality Management System.
Vortex Hydra design and manufacture Spherical Valves having a nominal diameter up to 2700 mm diameter.