Disign Features
1. Anti-fire safe design
When the trunnion ball valve be used normally, it's sealed by seat and ball surface, seat retainer sealed by O-ring and body, this is soft sealed and reliable sealing. When the seat and O-ring are burnt, the seat retainer and body will be sealed by expanded graphite. Thus act anti-fire safe purpose.
2. Anti-static device
In order to prevent friction among ball, stem and PTFE that generates static electricity which may light the combustibles and explosives that cause an accident, in this ball valve, static-conduction spring is set between the stem and the ball, the stem and the body. Thus static electricity is conducted to ground and system safety is secured.
3. Free leakage of body Sealed construction
The connective position of valve body and bonnet is double sealed by gasket and O-ring, on this base, such factors as fire, high temper shock and uneven opening or closing of the torque all can't induce external leakage.
4. Low torque in operation
The self-lubricated bearings are installed at the friction of stem, resulting in wear resistance, flexibility of operation and low torque.
5. Double block & bleed (DBB)
When ball is full open or close position, the transmitter substance in center cavity of body can be released by drainage and emptying devices. In addition, the over loaded pressure in the center cavity of valve can be released to low pressure end by self relief seat.
6. Emergency sealing
Compound injection holes are designed and compound injection valves are installed at locations of stem/cap and body support of side valve. When sealing of stem or seat is damaged to induce leakage, the compound can be used to do the second time sealing. A concealed check valve is installed in side of each compound injection valve is the connector for fast connection with compound injection gun.
Applicable Standards:
1. Design & Manufacture Std.: ASME B16.34, API608, API6D.
2. Fire safe: API 607
3. Anti static: API 608
4. Face to face: ASME B 16.10
5. End flanges: ASME B 16.5
6. Inspection and test: API 598 / API 6D
7. Blow-out proof stem;
8. ISO 5211 Mounting pad
9. Forged Steel Ball Valves conform to BS5351 and MSS SP-118. Each valve is inspected and tested in accordance with API 598, and marked per MSS SP25.
10. Main materials: A105, LF2, F5, F22, F304, F316, F347, F321, F51, Monel, 20# Alloy
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