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Bonneted gate valves are designed and manufactured in accordance with “Bureau of Reclamation” standards, always with a rectangular geometry, which is generally located on bottom or mid-bottom water outlet conduits, embedded in concrete with the exception of the actuator (fig.1). Its normal configuration includes a service gate (downstream) and a safety gate (upstream) for maintenance purposes.
It is an fabricated and specially robust construction, the flush bottom design of which avoids the accumulation of solids, and the absence of rubber seals avoids potential leakage over the long term due to the rapid deterioration of this kind of material.
All ORBINOX bonneted gate valves are designed for the specific service conditions of each particular case. The structural evaluation is performed using the finite elements method and CAD modelling systems. The standards used in the evaluations are:
DIN 19704: “Hydraulic Steel Structures. Criteria for Design and Calculation”.
DIN 19705: “Hydraulic Steel Structures. Recommendation for Design, Construction and Erection”.
Standards and design criteria of the Bureau of Reclamation (USBR) for sliding gates. The body of the gate is designed as a self-resistant recipient which resistant to the design pressure without the assistance of the concrete. The recess along which the gate moves is designed so that no downstream depression zones are created. The upper and side body faces downstream are appropriately bevelled for this purpose (fig.2).
BU
1. GENERAL DESCRIPTION 2. DESIGN CHARACTERISTICS
Fig. 1
Fig. 2
The gates are normally raised to a height where, in the maximum open position, the lower edge of the gate is slightly above the upper body face (fig.3) so that in cases of small leaks in hydraulic circuit, the position indicators together with the hydraulic units have sufficient margin to carry out a hydraulic reset to return the gate to its maximum opening position.
Reserves the right to chage specifications without notice ORBINOX S.A. Pol. Ind. s/n - 20270 ANOETA - Tel.: +34 943 698030 - Fax: +34 943 653066 - e-mail: [email protected] ORBINOX CANADA, ORBINOX USA, ORBINOX BRASIL, ORBINOX COMERCIAL, ORBINOX UK, ORBINOX FRANCE, ORBINOX GERMANY, ORBINOX INDIA, ORBINOX CHINA, ORBINOX S.E.A.
OBX 09/10 EDITION 1 REVISION 1 BU-
OBX 09/10 EDITION 1 REVISION 1 BU-
A gate valve has the following elements:
Gate Body and bonnet Actuation cylinder By-pass device Air adduction device
Gate: The gate is a robust part, made from either thick steel plate sheets or from an fabricated structure, with a skin plate located on the upstream position. The gate has seats on the sides, upper and lower faces. All of said seals are bronze, with the exception of the bottom one which is made of stainless steel. Bronze sliders are located on the front face of the gate which fit with the counter guides. Similarly, sliders are located for guiding the gate at the side. Four wedges are also arranged on the front face in order to guarantee closure with little water pressure. The gate has a 45º bevel and has the side and top horizontal seat facing in bronze, which are correctly adjusted and machined in order to achieve the required tightness required. The lower edge of the panel is machined austenitic stainless steel and sits upon a piece of the same material located on the bottom of the gate.
Body and bonnet: The body of the valve is designed as two fabricated sub units and are joined together along its vertical length using flat screwed flanges. The front body is formed by a short armoured section joined to the upstream part of the valve recess and its corresponding bonnet section (or housing chamber). It includes the stainless steel counter guides and has a series of horizontal stiffeners. The fixture of this body to the conduit armouring is done using a flat flange. The rear body includes the downstream part of the valve recess and bonnet and includes the sill, side and lintel seals along with the side guides, all of which are stainless steel, it also includes the venting inlet. Stiffening and joining to the rear armour of the conduit is done using a flat flange. The side seat facings, counter guides on the upstream faces and side guides at the bottom of the recess are made of stainless steel and designed to go along the height of the body and bonnet.
BU
Fig. 3
Fig. 4
The gate can be raised above the open position to the upper packing change position when required (fig.4). The sealing system in this position guarantees the water tightness of the shaft and allows the packing to be changed whilst the valve is loaded.
Maximum admissable leakage for this type of gate is 0.08 litres per second and linear meter of joint.
The aeration conduits are dimensioned is such a way that maximum depression does not exceed 2 mwc, for which air speed is limited (max. 90 m/s) with the aim of avoiding excessive load losses and air swirls in the conduits which could cause vibrations in the valve.
3. MANUFACTURING CHARACTERISTICS
Reserves the right to chage specifications without notice ORBINOX S.A. Pol. Ind. s/n - 20270 ANOETA - Tel.: +34 943 698030 - Fax: +34 943 653066 - e-mail: [email protected] ORBINOX CANADA, ORBINOX USA, ORBINOX BRASIL, ORBINOX COMERCIAL, ORBINOX UK, ORBINOX FRANCE, ORBINOX GERMANY, ORBINOX INDIA, ORBINOX CHINA, ORBINOX S.E.A.
OBX 09/10 EDITION 1 REVISION 1 BU-
BU
- Body part 1: Carbon Steel C S275JR + AISI 304 6. By-pass device: see BU-5 specifications file
- Body part 2: Carbon Steel C S275JR + AISI 304 7. Venting system: see BU-5 specifications file
- Panel: Carbon Steel S275JR + Bronze 8. Air relief safety valve: see BU-5 specifications file
- Hydraulic Cylinder: Shaft in AISI 304
- Packing Gland: Impregnated synthetic fibre
POSSIBLE MATERIAL COMBINATIONS
Reserves the right to chage specifications without notice ORBINOX S.A. Pol. Ind. s/n - 20270 ANOETA - Tel.: +34 943 698030 - Fax: +34 943 653066 - e-mail: [email protected] ORBINOX CANADA, ORBINOX USA, ORBINOX BRASIL, ORBINOX COMERCIAL, ORBINOX UK, ORBINOX FRANCE, ORBINOX GERMANY, ORBINOX INDIA, ORBINOX CHINA, ORBINOX S.E.A.
OBX 09/10 EDITION 1 REVISION 1 BU-
BU
OPERATING CONDITIONS
Valve application: Maximum operating pressure: mwc Design Pressure: mwc Maximum Flow: m^3 /s BU valve configuration: Only valve Tandem (Safety + Service)
CHARACTERISTICS
Conduit dimensions: mm x mm Bypass: DN mm 2 Manual gate valves (with outer spindle in AISI 304) 1 manual gate valve (with outer spindle in AISI 304) and 1 motorised gate valve Other:
Aeration: x DN mm Dual function Triple function
Air relief safety valve: Manual gate valve (with outer spindle in AISI 304); one per relief valve. Other:
Actuator: Hydraulic Hydraulic Unit Electrical Cabinet ( V/ Hz) Electric (DIN; V/ Hz) Manual Observations:
TESTS
NDT Welding approval: ASME IX Other:
OBSERVATIONS
SPECIFICATIONS OF THE "BUREAU" TYPE SLIDING GATE VALVE
Reserves the right to chage specifications without notice ORBINOX S.A. Pol. Ind. s/n - 20270 ANOETA - Tel.: +34 943 698030 - Fax: +34 943 653066 - e-mail: [email protected] ORBINOX CANADA, ORBINOX USA, ORBINOX BRASIL, ORBINOX COMERCIAL, ORBINOX UK, ORBINOX FRANCE, ORBINOX GERMANY, ORBINOX INDIA, ORBINOX CHINA, ORBINOX S.E.A.
