API 6D Cast Steel Wcb/304/316 Trunnion Mounted Flange Type Ball Valve

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Product Details

NSV cast trunnion mounted ball valve is widely used in oil, nature gas pipeline and the industries of liquefied gas, coal gas, etc. as an open/close control element. The design of seat seal uses unique two-level soft seal and metal to metal seal to form triple sealing to ensure seal reliability with small open/close torque and easy operation. So it is safe and free of maintenance to use this series of ball valve.

This type of valves has advantage of less weighted and cost effective with cast body . It is ideal for frequent on-off flow control in big size and high pressure pipeline.

Applicable Standard
Design Standard: API 6D, ASME B16.34, BS 5351, API 608, MSS SP-72
Face to Face: ASME B16.10, API 6D, EN 558
End Flange: ASME B16.34, DIN 2501
Buttwelding Ends: ASME B16.25
Inspection and Test: API 598, API 6D

Products Range
Size: 2" ~ 48"(DN50 ~ DN1200)
Rating: ANSI 150lb ~ 2500lb
Body Materials: Carbon steel, Stainless steel
Trim: A105+ENP, 13Cr, F304, F316
Operation: Lever, Gear, Electric, Pneumatic, Hydraulic actuators

Design Features
Full port or reduced port
Trunnion mounted ball
Blowout-proof stem
Double block & bleed
Emergency sealant injection

STRUCTURAL FEATURES

1. Double Block And Bleed(DBB)
When the valve is closed and the middle cavity is emptied through the discharge valve, the upstream and downstream seats will independently block the fluid at the inlet and outlet to realize double block function. Another function of the discharge device is that the valve seat can be checked if there is any leakage during the test. In addition, the deposits inside the body can be washed and discharged through the discharge device to reduce damage to the seat by impurities in the medium.

2.Emergency Sealing Device
The ball valves with the diameter more than or equal to 6″（DN150） are all designed with sealant injection 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 leakage on seat ring and stem. If necessary, the auxiliary sealing system can be used for washing and lubricating the seat to maintain its cleanliness.

3. 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 the independent spring loaded upstream and downstream sealing seats are used, the over-pressure inside valve cavity can overcome the pre-tightening effect of the spring, so as to make the seat release from 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 the upstream part(inlet) produces a reverse force on A1. As A2 is higher than A1, A2-A1=B1, the force on B1 will push the seat to the ball and realize tight sealing of the upstream part.

The downstream side: Once the pressure Pb inside the valve cavity increases, the force exerted on A3 is higher than that on A4.As A3-A4=B2, the pressure differential on B2 will overcome the spring force to make the seat release from the ball and realize pressure relief of valve cavity to the downstream part. Afterwards, the seat and ball will be sealed again the spring action.

4. Double Sealing (double Piston)
The trunnion pipeline ball valve can be designed with the double sealing structure before and after the ball for some special service conditions and user requirements.Double seal combination of O-ring and stainless steel graphite metal wound gasket is adopted between body and adapter,so that our valves can meet and exceed the fugitive emission requirements across wide range of pressure and temperature applications.Valves are also suitable for above and underground installation.

5. Anti-static Structure
The ball valve is provided with the 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 dut 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.

6. Extension Stem(Optional)
As for the embedded valves, the extension stem can be supplied if ground operation is needed. The extension stem is composed of stem, sealant injection valve, and drainage valve that can be extended to the top for the convenience of operation. Users should indicate the extension stem requirements and length when placing orders.

FAQ

1.Q: What’s the brand of your company can supply ?

A:NSV or OEM service

2. Q:Does “NSV” valves have supply to any value end user?

A:Yes,,it just like PETROKIMIA GRESIK in Indonesia, BP Iraq,ESFAHAN MOBARAKEH STEEL In Iran etc.

3. Q:What’s the packing for shipping?

A:Its carton for small valves(sample) and plywood case(don’t to fumigate).

High Performance for API 6D Cast Steel Wcb/304/316 Trunnion Mounted Flange Type Ball Valve, We put the product quality and customer's benefits to the first place. We've been confident that we have been going to share mutual achievement and create strong co-operation relations with our companions in this marketplace. We adopt advanced management, implement lean production, and strictly control quality to ensure that the products produced by our company are of high quality and low price. At the same time, the factory has always been adhering to the user's needs as the core, focusing on product market development, providing enterprises with high-quality, attentive and complete after-sales service, winning the trust and praise of many enterprises.