Sleeve Valve
Fields of application : Dams and hydropower،
Medium : Raw water،
Body : Stainless Steel، Carbon steel, low alloy steel, etc، Steel،
Disc : Carbon steel, low alloy steel, etc، Steel،
Sealing : EPDM، NBR،
Temperature °C : Up to 70
Size (mm) : 2200 - 200
Pressure (bar) : 25 - 6
Price :
Description :Flanges: DIN EN 1092-1 (DIN 2501)
Application:
Sleeve Valves use as on – off & also throttling Discharge equipments in dams, power plants & pipelines.
Operation:
These type of valves Based on a concrete pedestal & inject wetter from Special form of valve Downstream.
Injection of water to concrete wall that Rein forced by stainless steel plate cause to smash the high level of water energy & lead to over flow from pond slowly.
Technical specificities:
Main materials:
Carbon steel, stainless steel, copper Alloys
Characteristic traits:
Coating:
All Parts covered by electro static epoxy Powder
(Rall 5005 – 5015).
Needle Valve
Fields of application : Water transmission، Industrial applications، Water Distribution network، Water treatment، Dams and hydropower،
Medium : Drinking water، Raw water، Sea water،
Body : Stainless Steel، Nickel Aluminum Bronze، Ductile Cast Iron، Carbon steel, low alloy steel, etc، Aluminum Bronze ،
Disc : Nickel Aluminum Bronze، Steel، Carbon steel, low alloy steel, etc، Ductile Cast Iron،
Sealing : EPDM، NBR،
Temperature °C : up to 70
Size (mm) : 1800 - 100
Pressure (bar) : 40 - 6
Price :
Description :
Product Features:
The annular flow cross section prevents vibration and allows a linear ratio of flow variation to the valve opening percentage. Linear movement of the plunger in forward direction causes reduction of flow rate and at the end position closes the valve with complete tightness by positioning the piston profile sealing ring on the seat ring.
Body: a cone shape, in one piece in the small sizes and in few pieces in the larger sizes.
Piston Guide: The long piston guide ensures smooth piston movement in each direction without vibration.
Seat ring: Different application of needle valves is determined by different replaceable types of seat rings.
Gearbox: The valves can be operated by worm screw gearbox, hand wheel or by electric and hydraulic actuators.
Application:
The Needle valves may be used for pressure control and flow adjustment in pumping lines and main supply lines. Flow media is water, Air (other media on request), permissible working temperature is 70°C.
Corrosion protection:
All casting parts are coated with epoxy powder RAL 5015 or 5005 by electrostatic method.
Outlet Valve
Fields of application : Industrial applications، Dams and hydropower،
Medium : Raw water،
Body : Carbon steel, low alloy steel, etc،
Disc : Carbon steel, low alloy steel, etc، Steel، Ductile Cast Iron،
Sealing : EPDM، NBR،
Temperature °C : Up to 70
Size (mm) : 2000 - 300
Pressure (bar) : 25 - 6
Price :
Description :Flanges according: DIN EN 1092-1 (DIN 2501)
Product Features:
Mirab co. Outlet valves are capable of keeping the flow in a constant and steady condition. In addition it can increases the volume of flow in an emergency situation e.g. flood water or etc. (The reason of increasing flow, is preventing any damages to the side walls of dam.) The structure of Outlet valves are made firmly and rigidly to eliminate any cavitations and vibration and prevention of harming to the other structures. In high speed of flow, water takes some big solid parts into the valve (such as stones, wooden parts, etc) The structure of valve is so that these parts can not harm to the body of valve and they can pass through the valve and will not make any difficulty for opening and closing.
Advantages:
- Wide range of size (DN) and pressure (PN)
- Selection of best material for all application.
- Suitable shape for flow medium and solid particles.
- The option of selecting either Electrical or Hydraulic actuators (as request)
- Possibility off installation in valve room or end of pipeline.
Applications:
Mirab co. Outlet valves are usually used as water pipelines or dams discharge (into atmosphere) and Hydro power plants. Beside of Mirab co. Needle valve, Outlet valves are also for dissipating, controlling and shutting of enormous amount of water energy in end of reservoirs.
Corrosion Protection:
Powder Epoxy by Electro Static System with Minimum thickness 250 µ (inside and outside).
Hydrostatic test Pressure (bar) according to DIN EN 12266-1
Nominal Pressure
PN (bar)Test Pressure, with water, (bar)
Seat
Body
6
6.6
12
10
11
17
16
17.6
25
25
27.5
37.5
Hollow Jet Valve
Fields of application : Dams and hydropower،
Medium : Raw water،
Body : Ductile Cast Iron، Carbon steel, low alloy steel, etc،
Disc : Carbon steel, low alloy steel, etc، Ductile Cast Iron،
Sealing : EPDM، NBR،
Temperature °C : Up to 70
Size (mm) : 1800 - 500
Pressure (bar) : 25 - 6
Price :
Description :
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.
Corrosion protection:
All casting parts are coated with epoxy powder RAL 5015 or 5005 by electrostatic method.
Product group : Control Valves (for special application)،
Product group : Control Valves (for special application)،
Flanges: DIN EN 1092-2 (DIN 2501)
To get further information about valves’ installation, operation andmaintenance, please contact AB technical department.
Product group : Control Valves (for special application)،
Product group : Control Valves (for special application)،
Product features:
To get further information about valves’s installation, operation andmaintenance, please contact AB technical department.