Duplex Stainless Steel Forged Trunnion Ball Valve

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Product Details

NSV trunnion mounted ball valve is new high performance ball valves and It is suitable for long distance pipeline and general industrial pipeline. Its strength, safety and resistance to harsh environment are specially considered in the design. It is suitable for all kinds of corrosive and non-corrosive media.

The trunnion mounted ball valve has two or three body structures, the middle flange is connected by bolts, and the sealing is made of reinforced PTFE inserted into the stainless steel ring. The spring is set at the back of the ring to ensure that the seat is close to the ball and keep the sealing. PTFE bearings are installed on the upper and lower valve stems to reduce friction and save labor. The bottom of the small shaft is equipped with adjusting plates to ensure the contact position between the ball and the sealing ring. Full diameter: the valve flow diameter is the same as the inner diameter of the pipeline for pipeline cleaning.

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 bore or reduced bore
Trunnion mounted ball
Cavity pressure self relief
Fire safe design to API 607 / API 6FA
Anti-static to BS 5351

STRUCTURAL FEATURES

1. Double Block And Bleed(DBB)
The seat adopts floating structure,through the action by the spring behind the seat,the seat can keep close contact with the ball,providing independent sealing of upstream and downstream media at low pressure differential.If the pressure in middle cavity is too high,either of them can conquer the pre-tightening force of spring and discharge,so as to relize the double block and bleed function.

2. Low Operating Torque
The trunnion pipeline ball valve adopts the trunnion ball structure and floating valve seat, so as to achieve lower torque under operating pressure. It uses self-lubricating PTFE and sliding bearing to reduce the friction coefficient to the lowest in conjunction with the high intensity and high fineness stem.

3. Fireproof Structure Design
In case of fire during the use of valve, the seat ring, stem O ring and middle flange O ring made of PTFE, 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 make the metal seal ring contact the ball and form the auxiliary metal to metal sealing structure, which can effectively control valve leakage. The fireproof structure design of trunnion pipeline ball valve conforms to requirements in API 607,API 6FA,BS 7655 and other standards.

4. Safety Relief Device
As the ball valve is designed with the advanced primary and secondary sealing that has double piston effect, and the middle cavity cannot realize automatic pressure relief, the safety relief valve must be installed on the body in order to prevent the danger of over-pressure damage inside the valve cavity that may occur due to thermal expansion of medium. The connection of the safety relief valve is generally NPT1/2. Another point to be noted is that the medium of the safety relief valve is directly discharged into the atmosphere. In case direct discharging into the atmosphere is not allowed, we suggest that the ball valve with a special structure of automatic pressure relief towards upper stream should be used. Refer to the following for details. Please indicate it in the order if you don not need the safety relief valve or if you would like to use the ball valve with the special structure of automatic pressure relief towards upper stream.

5. Reliable seat sealing structure
The 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 spring pre-tightening. In addition, the piston effect of valve seat is desinde reasonably, which realizes high pressure sealing by the pressure of the medium itself. The following two kinds of ball sealing can be realized.

6. Blow-out Proof Stem
The stem sdopts the blow-out proof structure. The stem is designed with the footstep at its bottom so that with the positioning of upper end cover and screw, the stem will not be blown out by the medium even in case of abnormal pressure in the valve cavity.

FAQ

1. Q:Does your company have any agent/distributor with the exception of China?

A: At present,we have agent in Indonesia,Singapore,Canada,Mexico,Iraq,and welcome contact us if you would like to join us.

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:Do you have customized valve?

A:Yes,we can supply customized valves.

We have professional quality management and testing. Our products are produced through strict quality control system. Our company focuses on helping our customers achieve one common goal that is to produce more quality Duplex Stainless Steel Forged Trunnion Ball Valve at a low price. We care for our employees and work side by side to realize the common ideals of the company and employees. Since integrity is the foundation of human beings and the root of business, it becomes the cornerstone of our strong brand.