Gear Box DN 200 Metal Seal Ball Valve Spray Welding Tungsten
Carbide
Product Description
Metal to metal forged steel ball valve is mainly used to cut off or
connect the medium in the pipeline, can also be used for fluid
regulation and control.This type of valve in the pipeline should
generally be installed horizontally.
| Design standard | API6D,ASME B16.34,BS5351 |
| Connection ends | RF,RTJ flange,butt-welded,thread,socket welded |
| Actuator | manual,gear, worm,pneumatic,electric,gas-liquid interaction etc. |
| Nominal diameter | 2” – 48” (DN 50-DN 1200) |
| Pressure range | CLASS 150 – CLASS 2500 (Mpa 1.6- Mpa 42.0) |
| Materials | carbon steel,stainless steel,20#steel ,nickel alloy,cobalt alloy |
| Application | petroleum,natural gas,chemical,petrochemical,power station,
metallurgy,papermaking etc. |
Features
1. Effortless operation: the ball is supported by the upper and
lower bearings, which reduces friction and eliminates the
excessive torque caused by the huge sealing load formed by the
inlet pressure pushing the ball and the sealing seat.
2. Reliable sealing performance: PTFE separate performance material
seal ring is embedded in the stainless steel valve seat, and a
spring is provided at the end of the metal valve seat to ensure
sufficient pre-tightening force of the sealing ring. When the
sealing surface of the valve is worn during use, under the action
of the spring The valve continues to guarantee good sealing
performance.
3. Fireproof structure: In order to prevent the PTFE sealing ring
from being burned out due to sudden heat or fire, large leakage
occurs, and the fire is promoted, a fireproof sealing ring is set
between the ball and the valve seat. When the sealing ring is
burned out, Under the action of the spring force, the valve seat
sealing ring is quickly pushed to the sphere to form a metal-to-
metal seal, which has a certain degree of sealing effect. The fire
resistance test meets the requirements of APl6FA and APl607
standards.
4. Automatic pressure relief function: When the pressure of the
stagnant medium in the valve cavity rises abnormally and exceeds
the pre-tightening force of the spring, the valve seat retreats
from the sphere to achieve the effect of automatic pressure
relief, and the valve seat automatically resets after the pressure
relief.
5. Drainage pipeline: the upper and lower parts of the valve body
are provided with drainage holes L, which can check whether the
valve seat leaks. During operation, when the valve is fully opened
or fully closed, the pressure in the middle cavity can be
removed, and the packing can be replaced directly; the middle
cavity can be discharged. Cavity retentate to reduce the
contamination of the valve by the medium.
