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Three Piece Ball Valve

Three Piece Ball Valve


Description of Three Piece Ball Valve:

ZECO is a professional manufacturer of three-piece ball valve, which can be divided into a three-piece trunnion mounted ball and three pieces floating ball. The philosophy of the three-piece float ball valve: this floating ball valve is supported by two seats with one ball. Under the action of medium pressure, the ball itself will produce a certain displacement, so that it is pressed on the valve seat sealing ring at the outlet, to ensure the tightness of the outlet.

 

Features of Three Piece Ball Valve:

1. In case of fire, the nonmetal packing or seat (non-proof material) will be burnt, the considerable medium leakage may possibly cause fire spread, here, the fire protection structure functions to prevent the medium from mass leakage. As shown in the figure, once the seat is burnt, the ball will directly contact the metal face on the valve body, thus to prevent medium leaking out from the burnt seat. The design of fire protection and anti-static structure shall conform to the requirements of API607, and the second part of BS6755;

2. The connection between body and bonnet is sealed by O-ring, in order to prevent the leakage by flame or high-temperature vibration, the special steel-to-steel connection is designed to prove no leakage;

3. The newly designed seat combines advanced fabrication experience enables reliable sealing. For low pressured ZECO three-piece ball valve, concerning that the low pressure will not guarantee reliable sealing, so the spring-loaded design is added to low pressure, extra low pressure or vacuum ball valve. Middle pressure and high pressure three-piece valve seat structure is assembled with PPL which is able to bear the pressure to 300℃. While metal to metal seat enables higher temperature. Such structure owns single direction sealing capacity;

4. ZECO three-piece ball valve has to reduce bore type and full bore type with the minimum flow resistance(zero actually).


Material of Three Piece Ball Valve:

No

Part

Material

1

Body

ASTM A182 F316

2

Bonnet

ASTM A182 F316

3

Bonnet Bolt

ASTM A193 B8M

4

Bonnet Nut

ASTM A194 8M

5

Bonnet Gasket

Graphite +SS316

6

Seat Ring

VITON

7

Ball

ASTM A182 F316

8

Stem

ASTM A276 316

9

Stem Packing

Graphite

10

Gland

ASTM A351 CF8M

11

Stop Collar

ANSI 1025


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