SV inlet spherical valve with valve-type service seal

Parameters:

  • Diameters D = 710mm…4200mm
  • Heads H = 170m…800m

Possible drive types:
  • - counterweight for closing, servomoror for opening
  • - servomotor for opening and closing
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№ Designation Material
1 Body Carbon steel
2 Rotor Carbon steel
3 Valve Carbon steel
4 Service seal ring (in the body and on the rotor) Stainless steel
5 Maintenance seal movable ring Stainless steel
6 Maintenance seal stationary ring Stainless steel
7 Trunnions Stainless steel / Carbon steel with stainless surface built up by welding
8 Bearings DEVA, self-lubricating
9 Bearing seal Polyurethane / NBR

SV spherical valve features:

  • capability of the valve emergency closing in the stream of water at maximum flow rate
  • when the spherical valve is closed, the rotor and trunnions are not loaded by axial hydraulic thrust (they are loaded for a short time during opening and closing), which considerably extends the spherical valve service life
  • service seal (metal-to-metal)
  • maintenance seal (metal-to-metal) is intended for replacing the service seal under the protection of the maintenance seal without dewatering the penstock
  • two rows of seals in the trunnion bearings
  • manually driven locking member for fixing the rotor (to perform operations in a safe manner under the protection of the valve)
  • limit switches for the valve closed and open positions
  • electrical interlock to prevent the rotor rotation until the maintenance seal and locking member are open
  • drainage from the valve body
  • maintenance seal bypass
Spherical valve with counterweight driving mechanism for closing and servomotors for opening

Spherical valve with counterweight driving mechanism for closing and servomotors for opening

Scope of equipment required to install the spherical valve at HPP

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