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BALL VALVE
Product Description
Ball valves are mainly designed to conform API 6D and ASME B16.34.
Other related standards such as ASME B16.5 (Pipe Flanges and Flanged Fittings), ASME B16.25 (Buttwelding Ends), ASME B16.10 (Face to Face and End-to-End Dimensions of Valves) are also used for the design of ball valves.
Also our ball valves are designed to meet FIRE SAFE requirements to API 6FA and API 607.
Final testing is done to conform API 598 (Valve Inspection and Testing) ,API 6D (Specification for Pipeline Valves) requirements.
Materials are selected mainly to ASTM standards and when sour service is specified to meet NACE MR-01-75 (Sulfide Stress Cracking resistant Metallic Materials for Oilfield Equipment).
Product Specifications
DESIGN AND TEST
Ball valve are designed, constructed and tested according to API-6D standards.
DOUBLE BLOCK AND BLEED
All trunnion mounted type ball valve employ a sealing principle that facilitates all services requiring double block and bleed integrity.
DOUBLE PISTON EFFECT
On request the seat rings design may be modified to perform the double piston effect action.
In this case the pressure acting on both the external and internal side of the seat rings, results in force pushing the game against the ball, therefore each seat rings grants the required tightness even if the pressure is applied in the body cavity.
This feature adds an extra sealing feature to the valve, but to release the possible over pressure developed into the body cavity it is necessary to use an external safety relief valve.
PRIMARY METAL SECONDARY SOFT SEAT (PMSS)
The seat of this valve is applied with a high hardness coating on the first sealing surface, the second sealing surface has a high sealing force and low friction rubber.
This double sealing structure completely prevents leakage from the secondary sealing even i f leakage occurs due to damage to the primary metal seat. PMSS seat design extends the life of the valve by increasing the stability from the seat leakage of the valve.
FIRE SAFE CONSTRUCTION
The secondary metal seat is provided to contact between the seat and ball in the event the primary non-metallic seat is destroyed by fire all trunnion mounted type ball valve are fire-safe designed. The double body and cap seals provide maximum security. It is fitted with special graphite seals so as to effectively preclude leakage in the event of fire. All top trunnion mounted ball valve have been tested to API-607 and API-6FA.
AT ALL TIMES-STEM SEAL
This option provides premier valve stem sealing characteristics for adverse conditions of extreme pressure/ temperture variations. Designed to meet the most stringent fugitive emission regulations,design is comprised of an extra deep stuffing box/packing/stem seal retainer & conical disc spring. The disc spring provide contiuous compression of the packing assembly and compensate for wear.
DOUBLE SEAL STRUCTURE
Double seal structure is applied to prevent external leakage, and the inside use rubber seal and the outside use non-flammable seal.
BLOW-OUT PROOF STEM
Stem is made separately from the ball, blow-out proof design.
The lower end of the stem is designed with an integral collar to be blowout-proof.
ANTI-STATIC DESIGN API 6D (ISO 17292)
Ball valve present a particular problem with the build up of static electricity auound the ball.
They have anti-static design which provides contact between stem and ball, and stem and body to eliminate static electricity.
EMERGENCY SEALANT INJECTION SYSTEM
The sealant injection system located on the body can be utilized in case of emergencies, o-ring damage, or if stem leakage occurs.
LUBRICANT / EMERGENCY SEAT SEAL
Special sealants may be injected into fittings that are located on the adapter flanges to restore sealing integrity if seat sealing surface is damaged.
HEAVY DUTY BEARINGS
Heavy duty bearings balance the pressure load on the ball by reducing friction between ball and seat resulting in smooth and easy operation of valve.
TRUNNION LOW STEM DESIGN
Trunnion mount design locates the low stem trunnion assembly within the confines of body & cap. In so doing, both the line pressure and media act upon all valve cavity components equally.
The advantages of such a design include:
1. The pressure & media does not concentrate in one location only, instead the forces are dispersed equally throughout the pressurized areas.
2. Ball movement and side loading of lower stem is minimized, thereby decreasing operational torque valve and improving stem seal life end.
3. Gurantee the low torque and extend valve life.
Usage