Basis Informatie.
Materiaal
Roestvrij staal
Kanaal
Straight Through Type
Structuur
Vaste Kogelklep
Temperatuur
Normale temperatuur
Toepassing
industrieel gebruik, Water industrieel gebruik, huishoudelijk gebruik
Painting
Manufacture′s Std
Product Warranty
12~18 Months
Specificatie
CE, ISO, API
Beschrijving
DBB Ball valve 1,Double Block And Bleed (DBB)When the valve is closed and the middle cavity is emptied through the discharge valve, the upstreamand downstream seats will independently block the fluid at the inlet and outlet to realize double blockfunction. Another function of the discharge device is that the valve seat can be checked if there is anyleakage during the test. In addition, the deposits inside the body can be washed and dischargedthrough the discharge device to reduce damage to the seat by impurities in the medium.2,Low Operating TorqueThe trunnion pipeline ball valve adopts the trunnion ball structure and floating valve seat, so as toachieve lower torque under operating pressure. It uses self-lubricating PTFE and sliding bearingto reduce the friction coefficient to the lowest in conjunction with the high intensity and high finenessstem.3,Emergency Sealing DeviceThe ball valves with the diameter more than or equal to 6″(DN150) are all designed with sealantinjection device on stem and seat. When the seat ring or stem O ring is damaged due to accident,the corresponding sealant can be injected by the sealant injection device to avoid medium leakageon seat ring and stem. If necessary, the auxiliary sealing system can be used for washing andlubricating the seat to maintain its cleanliness.4,Fireproof Structure DesignIn case of fire during the use of valve, the seat ring, stem O ring and middle flange O ring made ofPTFE, rubber or other non-metal materials will be decomposed or damaged under high temperature.Under pressure of the medium the ball valve will push the seat retainer rapidly towards the ball to makethe metal seal ring contact the ball and form the auxiliary metal to metal sealing structure, which caneffectively control valve leakage. The fireproof structure design of trunnion pipeline ball valve conforms torequirements in API 607,API 6FA,BS 7655 and other standards.5,Anti-static StructureThe ball valve is provided with the anti-static structure and adopts the static electricity discharge deviceto directly form a static channel between the ball and body or form a static channel between the ball andbody through the stem, so as to discharge the static electricity produced dut to friction during the openingand closing of ball and seat through the pipeline, avoiding fire or explosion that may be caused by staticspark and ensuring system safety.6, Reliable seat sealing structureThe seat sealing is realized through two floating seat retainers. They can float axially to block the fluid,including ball sealing and body sealing. The low pressure sealing of valve seat is realized by springpre-tightening. In addition, the piston effect of valve seat is desinde reasonably, which realizes highpressure sealing by the pressure of the medium itself. The following two kinds of ball sealing can berealized.7, Single Sealing (automatic Pressure Relief In Middle Cavity Of Valve)Generally, the single sealing structure is used, that is, there is only the upstream sealing. As theindependent spring loaded upstream and downstream sealing seats are used, the over-pressureinside valve cavity can overcome the pre-tightening effect of the spring, so as to make the seat releasefrom the ball and realize automatic pressure relief towards the downstream part.The upstream side: When the seat moves axially along the valve, the pressure P exerted on theupstream part(inlet) produces a reverse force on A1. As A2 is higher than A1, A2-A1=B1, the forceon B1 will push the seat to the ball and realize tight sealing of the upstream part.8. Double Sealing (double Piston)The trunnion pipeline ball valve can be designed with the double sealing structure before and afterthe ball for some special service conditions and user requirements. It has double piston effect.Under normal condition, the valve generally adopts primary sealing. When the primary seat sealingis damaged and causes leakage. The secondary seat can play the function of sealing and enhancethe sealing reliability.The seat adopts the combined structure. The primary seal is metal to metal seal. The secondary seal isfluorine rubber O ring that can ensure the ball valve reach the bubble level sealinge . When the pressuredifferential is very low, the sealing seat will press the ball through the spring action to realize primarysealing. When the pressure differential rises, the sealing force of seat and body will increase accordinglyso as to tightly seal the seat and ball and ensure good sealing performance.Primary sealing: Upstream. When the pressure differential is lower or there is no pressure differential,the floating seat will move axially along the valve under the spring action and push the seat towards theball to keep tight sealing. When the pipeline pressure P increases, the force exerted on the area A2 ofvalve seat is higher than the force exerted on the area A1, A2-A1=B1. Therefore, the force on B1 will pushthe seat towards the ball and realize tight sealing of the upstream part.Secondary sealing: Downstream. When the pressure differential is lower or there is no pressuredifferential, the floating seat will move axially along the valve under the spring action and push the seattowards the ball to keep tight sealing. When the valve cavity pressure P increases, the force exerted onthe area A4 of valve seat is higher than the force exerted on the area A3,A4-A3=B1. Therefore, the forceon B1 will push the seat towards the ball and realize tight sealing of the upstream part.9. Safety Relief DeviceAs the ball valve is designed with the advanced primary and secondary sealing that has double pistoneffect, and the middle cavity cannot realize automatic pressure relief, the safety relief valve must beinstalled on the body in order to prevent the danger of over-pressure damage inside the valve cavity thatmay occur due to thermal expansion of medium. The connection of the safety relief valve is generallyNPT1/2. Another point to be noted is that the medium of the safety relief valve is directly discharged intothe atmosphere. In case direct discharging into the atmosphere is not allowed, we suggest that the ballvalve with a special structure of automatic pressure relief towards upper stream should be used. Referto the following for details. Please indicate it in the order if you don not need the safety relief valve or if youwould like to use the ball valve with the special structure of automatic pressure relief towards upperstream.10. Secial Structure Of Automatic Pressure Relief Towards Upper StreamAs the ball valve is designed with the advanced primary and secondary sealing that has double pistoneffect, and the middle cavity cannot realize automatic pressure relief, the ball valve with the specialstructure is recommended to meet the requirement of automatic pressure relief and ensure no pollutionto the environment. In the structure, the upper stream adopts primary sealing and the lower streamadopts primary and secondary sealing. When the ball valve is closed, the pressure in the valve cavitycan realize automatic pressure relief to the upper stream, so as to avoid the danger caused by cavitypressure. When the primary seat is damaged and leaks, the secondary seat can also play the functionof sealing. But special attention shall be paid to the flow direction of the ball valve. During the installation,note the upstream and downstream directions. Refer to the following drawings for sealing principle of thevalve with the special structure.11. Blow-out Proof StemThe stem sdopts the blow-out proof structure. The stem is designed with the footstep at its bottomso that with the positioning of upper end cover and screw, the stem will not be blown out by themedium even in case of abnormal pressure in the valve cavity.12. Corrosion Resistance And Sulfide Stress ResistanceCertain corrosion allowance is left for the body wall thickness. The carbon steel stem, fixed shaft,ball, seat and seat ring are subjected to chemical nickel plating according to ASTM B733 and B656.In addition, various corrosion resistant materials are available for users to select.According to customer requirements, the valve materials can be selected according to NACE MR0175/ISO 15156 or NACE MR 0103, and strict quality control and quality inspection should be carriedout during the manufacturing so as to fully meet he requirements in the standards and meet the serviceconditions in sulfurization environment.13. Extension StemAs for the embedded valves, the extension stem can be supplied if ground operation is needed. Theextension stem is composed of stem, sealant injection valve, and drainage valve that can be extendedto the top for the convenience of operation. Users should indicate the extension stem requirements andlength when placing orders.For ball valves driven through electric, pneumatic and pneumatic -hydraulic operations , the extensionstem length should be from the centre of pipeline to top flange.
Adres:
A1211, East Coast Plaza, No.5558 Chuansha Ave, Pudong New Area, Shanghai 201299, P.R.C
Soort bedrijf:
Fabrikant/fabriek
Zakelijk Bereik:
Elektrotechniek & Elektronica's, Industriële Apparaturen & Onderdelen, Instrumenten & Meters, Produceren & Verwerken Machine
Certificering Van Managementsysteem:
ISO 9001, ANSI/ESD
Bedrijfsintroductie:
V&C is een toonaangevende fabrikant van afsluiters in China met meer dan twintig jaar ervaring in het ontwerp en de levering van industriële kleppen en pijpfittingen.
De fabrikant van V&C-kleppen levert hoogwaardige producten en uitstekende diensten aan de olie- en gasindustrie, de petrochemische, chemische, energie- en elektriciteitssector, de scheepvaart en mijnbouw, van algemeen tot ernstig in gebruik.
Ons productassortiment omvat kogelkleppen, regelkleppen, choke-kleppen, hek-, bol- en terugslagkleppen, veiligheidskleppen, automatische recirculatiekleppen, andere industriële kleppen, Wellhead-apparatuur, Leidingen en fittings.
De gediversifieerde stroomregelingsoplossing van V&C bestaat uit kwartdraai- en meerslag-afsluiters in een verscheidenheid aan staalmaterialen, bekledingen, configuraties, afmetingen, drukklassen, die zijn ontworpen en op maat gemaakt om aan uw specifieke procesvereisten te voldoen.
V&C-afsluiters zijn gelicentieerd en gecertificeerd volgens API 6D, API 6A, API 600, API 607/API 6FA, ISO 9001 en andere monogrammen of goedkeuringen, zoals CE, BV, DNV, TUV, SGS, PED EN ATEX.
V&C richt zich op veiligheid en levertijd van het meten van afsluiters, engineering, fabricage, test & inspectie, lakken en transport. Onze filosofie van "High Sense of Responsibility for Clients" garandeert onze betrouwbaarheid en de totale tevredenheid van onze klanten. V&C streeft ernaar om wereldwijd voortdurend goede producten en diensten te bieden tegen concurrerende prijzen.