Drinking water
Wastewater
Industrial plant
Seawater
"Hollow Jet Valve (HJET)"
Size: DN500-1800 mm
Pressure: PN 6-25 bar
Product features:
In dam application, control valves such as Hollow jet valves are installed after the butterfly valves on the outlet
side. These valves always work as flow regulating or control valves. Hallow jet valves designed to perform
regulating or control function in water supply system without any vibration as much as valve opening.
Body: st.37 or ductile cast iron (DIN EN 1563)
Shutter: ductile cast iron (DIN EN 1563)
Stem and shaft: stainless steel 1.4021
Seat ring and orings: EPDM or NBR
Application:
The Hollow jet valves are often used for the discharge into free atmosphere. However in some cases the valves
can be used in a submerged condition where the downstream level is above the altitude of the installation.
In such cases in order to in ensure proper energy dissipation, a dissipation chamber with a specific hydraulic
profile is required so as to properly aerate the flow, avoiding hydraulic instability phenomenon. Reliable and
adjustable discharge of large water flows having low or high pressure requires large energy dissipation with
causing cavitations or excessive vibrations. The Hollow jet valve or fixed cone valve ensures very efficient control
and closure and provide on economic solution for dam bottom discharge or other energy dissipating system.
The design of Hollow jet valve, ensures excellent hydraulic performances, which can highlighted by a stable
discharge The energy dissipation is achieved with excellent conditions and ensures a symmetrical flow.
Hallow screw type:
These valves are divided into two main groups of manual and Electrical. Both types with a balancer chamber
inside of the valve (inside of piston) would be provided. Enter of water to chamber piston would be done through
the holes which are located on the face of piston so will reduce the Hydrostatics pressure in opposite surface
of piston, this means that pressure adjusting needs less force to obtain the minimum adjustment.
In comparative of Hallow jet valves with other valves, the adjustment force in Hallow jet valves is much less than
others when the piston is thoroughly closed, all the packing's are absolute sealed.
The movement of piston governs by means of a screw which is under control. The Hallow jet screw Type will
apply either manual or electrical actuator which works via conic gears (bevel gear), stem and stem nut.
Aplication fields for
