Product Detail

• Design standard:API 6D

• Length of structure:API 6D.

• Flange connecting end:ASME B16.5/ASME B16.47

• Butt welding connecting end:ASME B16.25/ ASME B31.8

• Wall thickness:ASME B16.34

• Fireproof test:API 607/API 6FA

• Inspection and test:API 6D

• Pressure and temperature rating:ASME B16.34

• Product scope:NPS 1-1/2″~NPS 60″,CL150~CL900

• Main body material:WCB､LCB､WCC､CF8､CF8M､CF3､CF3M､A890 4A etc.

• Valve seat material:PTFE､RPTFE､NYLON､DEVLON､Derlin､PEEK､PPL､HNBR､FKMor metal hard seal etc.

• Drive device:handle, worm wheel, electric, pneumatic, pneumatic- hydraulic, electro-hydraulic, etc.

STRUCTURAL FEATURES


1. Special Seat Design
The floating ball valve adopts the design of flexible seal ring structure. When the medium  pressure is lower, the contact area of seal ring and ball is smaller. so higher sealing ratio is formed at the place where the seal ring and ball contact to ensure reliable sealing. When the medium pressure is higher, the contact area of seal and ball becomes bigger along with the elastic deformation of seal ring, so the seal ring can endure higher medium thrust without being damaged.

2. Fireproof Structure Design

In case of fire during the use of valve, the seat ring made of PTFE or other non-metal materials will be decomposed or damaged under high temperature and cause higher leakage. The fireproof seal ring is set between ball and seat so that after the valve seat is burnt, the medium will push the ball rapidly towards the downstream metal seal ring to form the auxiliary metal to metal sealing structure, which can effectively control valve leakage. In addition, the middle flange sealing gasket is made of metal wound gasket, which can ensure sealing even under high temperature. The fireproof structure design of floating ball valve conforms to requirements in API 607,spi 6FA,BS 6755 and other standards.

3. Reliable Sealing Of Valve Stem
The stem is provided with the shoulder at its bottom so that it will not be blown out by the medium even under the extreme conditions such as abnormal pressure rise inside the valve cavity, failure of gland plate and etc. In addition, to avoid leakage after the stem packing is burnt in case of fire, the thrust bearing is set at the place where the stem shoulder and body contact to form a reverse sealing seat. The sealing force of the reverse seal will increase according to the increase of medium pressure, so as to ensure reliable stem sealing under various pressure, prevent leakage and avoid accident spreading.
4. Anti-static Structure
The ball valve is provided with anti-static structure and adopts the static electricity discharge device to directly form a static channel between the ball and body or form a static channel between the ball and body through the stem, so as to discharge the static electricity produced due to friction during the opening and closing of ball and seat through the pipeline, avoiding fire or explosion that may be caused by static spark and ensuring system safety.