High-performace pipeline ball valve-reduced bore

Product Description

pplications

API6D High-performance pipeline ball valve is Raymond(RMD)hightech products,as switch control equipment,it is mainly used in natural gas,oil,gas,liquefied natural gas pipeline transmission system and other industries,its anti-sulfur products containing hydrogen sulphide,impurities and high corrosion are suitable for the long-distance natural gas pipeline.
 

Main features

Body of high-performance pipeline ball valve is forged structure.The connection type for body and vice-body can be BB(bolted connection)and WB(welded connection).The WB(welded connection)and the LWB(Fully-welded extended stem)structure isadopted for buried ball valves,as shown below.
High performance pipeline ball valve series has the feature of strength,high perfect sealing,maintenance-free,long life and so on.The production of this series ball valve adopts the international advanced ball valve design and manufacturing technology,selects high-quality materials in accordance with the standard selection of materials and combines with advanced materials forming forging technology.At the same time,with the years of ball valve design and manufacturing experience,the use of advanced processing and manufacturing equipment and production and processing technology,through the first-class inspection and testing equipment and instruments,perfect quality assurance management system and excellence in the production of high-performance philosophy can ensure the quality of valves.This series of valve has the performance of a high strength,defect-free forging body,excellent sealing performance,even at maximum pressure difference(full pressure),it will still be able to ensure that seal without leakage,after frequent switching action to realize a safe usage in the transportation of oil,natural gas,coal gas,and other special medium transportation pipeline.
 

The special structure of valve seat seal

Floating structure means seat reciprocally can move along channel direction,so as to guarantee the ball and seat are tightly sealed.
(â… )Valve seat structure suitable for different occasions and sealing requirements
Valve seat can be designed as a standard single-piston effect and specific dual piston effect,Figure1 shows single-piston effect-inletside seal;Figure2 shows Dual Piston effect-outlet-side seal;Figure3 shows special dual piston effect sealing structure
(â…¡)Multi-level structure of the valve seat seal
As shown in Figure4,there are two elastic O-ring in the valve seat ring-ring A and ring B.Sealing ring A spring-loaded through the valve seat so that the sealing surface of sealing ring A tightly fit with ball surface to form an initial seal.When there is pressure in the system medium,the piston force
produced by the piston force produced by the piston effect of size difference makes elastic deformation of the ring A Ershi sealing surface and ball more closely fit the surface to form a re-sealing;meanwhile,due to ring A in the medium resulted in elastic deformation under pressure so that the sealing ring B is also closely fit the surface of ball for the formation of the second stage seal.When the system medium pressure increasing,it will have an enormous pressure in the valve seat ring A and ring B,so that the two seals have a greater elastic deformation,and then the metal valve seat ring surface and the ball surface sealing together to form a third level of metal to metal seal.
(â…¢)The assisted valve seat sealing equipment
Based on the actual service condition,medium requirement,sealing requirement,etc.,the assisted valve sealing equipment will be considered to be necessary or not.The assisted valve sealing equipment is a one-way valve installed outside of valve body that can prevent medium leakage and can inject sealing grease into valve body by external force.When the assisted valve seat sealing equipment is required,valve seat ring shall be design and processed with injection grove and hole to connect the assisted valve seat sealing equipments.Such equipment can prevent the medium by the sealing of injection of rease.Refer to Figure5 for reference.
Multi-level structure of stem sealing 
Figure6 shows the stem multi-level sealing by adopting"O"ring,flexible graphite and grease injection;"O"ring achieves the first level stem sealing;Replaceable flexible graphite realizes the second level sealing by the compression of packing sleeve and packing flange;And the third evel sealing is realized by installing assisted sealing injection valve to the packing box,and by designing with the injection groove and hole to connect with the stem injection valve,which can inject grease.
 

Unique and safe seat structures

Ball valve fireproof design is implementation of the API**7,API6FA standards.According to service conditions and user requirements,ball valve can be designed as a fireproof structure.
(â… )Fireproof structure of seat
As shown in figure7,there is composite fireproof ring,which are combined with graphite and stainless steel wire in the seat.Once the soft ring is burnt out in case of a fire,the fireproof ring and seat ring will form a piston structure through the spring to load the valve body.That will push and closely contact the metal seal surface of the seat ring to the body surface,So as to prevent a lot of medium from leaking from the burnt place of the seat ring,and prevent the fire from expending.
(â…¡)Fireproof structure(body and bonnet)
The seal gasket for bolt connecting valve body and valve bonnet,are used fireproof stainless steel wire and flexible graphite gaskets.Gasket compression load through the bolts and ultimately,ensure the valve body and valve cover between the metal to metal contact,so that the valve can with stand more high load,but also improve the fire safety of the valve.But for the full welded ball valve,the valve body and cover is welded structure,that fundamentally eliminate the possibillity of leakage of the valve housing.Even in the case of fire damage,there will be no leak.
(â…¢)Fireproof structure(body/packing and stem)
The body and packing connection gasket adopts fireproof stainless steel wire and flexible graphite gaskets.The stem packing adopts flexible graphite to ensure no leakage in case of fire.
 

Anti-blow out and anti-static structure of stem

As figure8 shows,the stem head is designed to convex forms with a big and small head structure.And it is hold tightly by the packing box so that the stem will not blow out when the cavity pressure increasing abnormally,during the valve operation,the friction of the ball and seat will cause static,which will gather on the ball.In order to prevent static sparks,we set a stem anti-static device to derive the electric charge gathering on the ball.
 

Automatic pressure relief structure

When the cavity pressure is increasing abnormally,the single-piston seat can release the pressure by the pressure-relief device installed on valve body;While the specific double-seat piston effect of the valve seat have automatic pressure relief function through the additional pressure relief devices installed on the valve body.
 

Double block and bleeding structure

In order to meet the customers' various requirement,the ball valve has two series,full-bore structure and reduced-bore.For the full-bore structure,the channel diameter is equal to the pipes,which is conceit for pipe clearing.For the reduced-bore,compared with the same size of full bore structure,it has smaller volume and lighter weight,so it is widely used,and has bright future.
 

Full-bore structure and reduced-bore structure

In order to meet the customers' various requirement,the ball valve has two series,full-aperture structure and reduced-aperture.For the full-aperture structure,the runner diameter is equal to the pipe's,so as to cleaning the pipe more easily.For the reduced-aperture,compared with the same size of full-aperture structure,it has smaller volume and lighter weight,so it is used widely,and has bright future.
 

Valve driven

We can supply two types of maual operated valves,one with hand level and the other on with hand operation device.The size of hand level operation valve is limited to 4"-Class**0；4"-Class**0；3"-Class**0；3"-Class**0；2"-Class***0；1"-Class***0。
We can also supply valves driven by electrical actuator,pneumatic hydraulic and hydro-pneumatic actuator,The connection flange is according to ISO***1

Extended stem design

We can extend the ball valve stem according to the customer specific requirement(underground ball valve).No specific restriction for the length of the exteded stem,but it must be specified before signing the order.

Main characteristics

LWB ball valve is a type of API6D fully welded ball valve with extended stem.It is mainly applied understand.Its valve body is buried understand while the operation device and accessories(assisted sealing device,exhaust/over pressure protection device,bleeding device)are above the groud by exteded stem,which enable the user to operate the valve easily.This type of valve can be driven by hand (worm gear),pneumatic,hydraulic,pneumatic-hydraulic linked and electrical actuator.Moreover,according to actual service condition and end user's special requirements,high performance,intelligent hydro-pneumatic and hydro-electrical ball valve can be designed as the switch device or energency device(with emergency shut down system).The intelligent hydro-electrical ball valve is a type of self-operation valve which can open or close by medium pressure in pipeline without extra assistance.

Extended stem size

The stem can be extended according to the customer's requirement.No specific restriction for the length of the extend stem,but it must be specified before signing the order.

Transit short pipe(sleeve pipe)

As long as following the instruction of the operation and installation,our fully-welded underground ball valve do not need the transit short pipe(sleeve pipe).If the customer needs the sleeve pipe,we can provide the following two choices:
A. forged steel sleeve pipe,welded on the basic material of the bonnet side before finishing,installed with the ball valve,the length can be up to **0mm.
B. as a part of the pipeline,the pressure grade and the specification of the sleeve pipe is equal to the pipeline.It is welded on the valve after the valve produced and inspected according to the standard.No size restriction,unless the shipment reasons.It is better than the customer provides the material if the grade and size is not standardized.

Accessories

We can supply the accessories according to the customer requirement.For example discharge pipe,bleed port,assistant grease injecting pipe,and so on.