Dams, ReseRvoiRsanD HyDRopoweR solutions
2 | Dams, ReseRvoiRs anD HyDRopoweR
GlenfielD Glenfield was established back in 1852 and as such is one of the most experienced valve manufacturers in the World.
Since the world leading AVK Group acquired Glenfield in 2001, design and technologies from other acquired UK valve manufacturers (ie Bestobell / Blakeborough, Guest & Chrimes/Saint Gobain) have been incorporated into Glenfield's product offer.
Major investments during 2005/06 have ensured Glenfield can meet the ever increasing requirements from the global water industry.
Today Glenfield is AVK Group's specialist manufacturing company for pressure/flow control valves (automatic and non-automatic design), large diameter gate and butterfly valves, non-slam recoil and conventional check valves, air valves, ball float valves etc.
To assist partners with local after sales service, project follow up, approvals with local utilities etc., Glenfield have Product Specialist Engineers in the following areas: UK, India, China, South East Asia, Middle East and Australia.
Glenfield work with its sister companies around the world to offer a wide range of products. For dams, reservoirs and hydropower projects, Glenfield cooperates with ORBINOX Valve International in Spain to provide full valve solutions.
ORBINOX offer high quality products such as radial gate, bonneted gate and roller gate valves together with fabricated penstocks. Full details of the ORBINOX company can be found at www.orbinox.com. Like Glenfield, ORBINOX have a wealth of experience in this market segment and by working together provide valve solutions ensuring the optimization of design, type and size of valves required.
For technical or product support relating to valve selection, please contact either Greg Morris; email@example.com or Enrique Jauregui; firstname.lastname@example.org.
Member of the group
Dams, ReseRvoiRs anD HyDRopoweR | 3
GlenfielDDams ReseRvoiRs anD
Glenfield, based in Scotland, are a valve company with considerable experience and expertise in supplying valves and valve solutions to global water and sewage systems.
Supplying valves since 1867 Glenfield continue to offer an extensive product range with valve sizes ranging from DN25 to DN3000.
Dams and Reservoirs is one of the key market segments with over a 100 years involvement.Glenfield control valves are installed in well over 100 dams around the world and continue to be a highly rated supplier of valve products and solutions for dams, reservoirs and hydro power projects.
Also within the range are specialist terminal discharge valves which provide accurate flow control as well as excellent energy dissipating characteristics.
These discharge valves can be used for a number of applications such as emergency drawdown, compensation / ecological flow, flood control, pressure relief and also for turbine bypass flow in hydroelectric power installations.
Because of the nature of these projects, flexibility in product design is highly important and Glenfield work closely with customers to ensure that the optimal valve size and type is chosen for each application.
Glenfield also offers supervisory support for valve installation and commissioning on products and are available to discuss any requirements.
Tel.: +44 (0)1563 521150
4 | Dams, ReseRvoiRs anD HyDRopoweR
Glenfield have been designing and supplying Free Discharge and Fixed Cone Valves since the 1950s. These valves have been developed from extensive in-house laboratory testing and thorough field investigations. These tests confirmed that an odd number of ribs effectively dampens vibrations that are found in other fixed cone designs.
Fixed cone valves are used to pass a controlled amount of water downstream with no damage to the immediate surroundings due to its fantastic energy dissipating characteristics. These valves also offer an effective method of aeration due to atmospheric dispersion.
The valve body is designed to operate with minimum vibration over its full stroke and uses multiple, specially shaped aerodynamically designed ribs leading to a downstream cone.
The outlet cone ensures that discharge is in the form of a hollow expanding jet, which is ideal for energy dissipation as the water is spread over a rapidly increasing surface area, thus permitting effective atmospheric cushioning. If containment of the jet is desired, a hood can be installed downstream of the valve.
The valve is manufactured from ductile iron. The sleeve is made from stainless steel and uses upstream and downstream seals to ensure drop-tight shutoff. Operation of the valve sleeve is via twin screwed spindles, worm gearboxes, intermediate rods and a double bevel input gearbox. Actuating gear may be manually, electrically or hydraulically operated.
The one piece cast unit is an important feature of this valve type in order to minimise vibrations and help provide maximum discharge. Other brands of Fabricated or welded FDVs may require numerous welds along the full length of the ribs, connection to the cone and flanges etc. This welding, in some cases, can be detrimental to the core material.
seRies 857 fRee DiscHaRGe valves(fDv)
Dams, ReseRvoiRs anD HyDRopoweR | 5
seRies 857 fRee DiscHaRGe valves
components1. Valve body2. Seal retaining ring3. Guide strips4. Seal5. Lifting brackets6. Shafts7. Operating spindles8. Couplings9. Support foot10. Lubricators11. Worm gearbox12. Double bevel gearbox
materialDuctile iron EN1563 EN-GJS.500/7 Ductile iron EN1563 EN-GJS.500/7Aluminium bronze EN12163 SW307GResilient SteelStainless steel EN10088Stainless steel EN10088MiscellaneousDuctile iron EN1563 EN-GJS.500/7MiscellaneousMiscellaneousMiscellaneous
6 | Dams, ReseRvoiRs anD HyDRopoweR
The size of the valve is determined by the required flow rates at the minimum net head at the valve. The net head is measured from the minimum upstream water surface to the centre line of the valve, less any friction losses from the conduit.
The graph below can be used as a general guide for valve size selection. Please contact Glenfield Valves for final valve selection
seRies 857 fRee DiscHaRGe valve sizinG
The equation to determine discharge is:
Q = Cd A2gH
Where :Q = Flow Discharge (m3 /s)C
d = Discharge coefficient of valve in fully open position without hood (0.83)
A = Area of valve based on nominal valve diameter (m2)H = Net head (m)
Dams, ReseRvoiRs anD HyDRopoweR | 7
There are a number of important features and benefits when using the FDV, these include:
seRies 857 fRee DiscHaRGe valve
featuRes & Benefits
Terminal Siting Free discharge Resilient seal External operating mechanism Cylindrical geometry Low head loss characteristics Single piece cast construction Atmospheric dispersion
Low civil building costs No cavitation Drop tight closure Simple and effective maintenance Hydraulic balance with low operating torque Maximum flow discharge potential Rigidity and strength Maximum energy dissipation / Minimum erosion
8 | Dams, ReseRvoiRs anD HyDRopoweR
seRies 857 fRee DiscHaRGe valve specificationThe FDV is designed for terminal regulating duties and shut-off applications under free discharge conditions.
Assembly of valve comprises body, sleeve, seal retaining ring, operating screws and nuts, worm and double bevel gear units, face and back end seals, intermediate drive shafts and universal couplings.
valve BoDy Is a cylindrical single piece casting from Ductile Iron BS EN1563 GJS 500/7, with a flange at the inlet, faced and drilled to specific requirements (BS EN1092-2). The downstream end is formed as an inverted cone cast integral with, and attached to, the cylinder by integral radial ribs.
The outer edge of the ribs and adjacent body sections are faced with extruded bronze strips of length to suit control sleeve travel.
Facings are provided at the upstream end to carry the worm gear units on the horizontal centre-line and the double bevel drive on top of the valve. A support foot is situated adjacent to the inlet flange on the underside of the valve.
valve sleeve Is a fabricated assembly comprising stainless steel cylinder and side brackets on which are mounted the operating nuts. The bore has a fine machined finish on which the back end sealing ring makes the sliding contact throughout the full length of the valve travel. The downstream end is chamfered to mate with the face seal and provides droptight contact in the closed position.
valve seals. The back end seal is housed in a body recess adjacent to the upstream end of the valve ports and provides sealing contact with the bore of the sleeve through the full valve t