API 6D TRUNNION
BALL VALVES
TSC Valve manufactures some of the most dependable cast and forged steel Ball Valves in the industry. Our products are manufactured and tested in accordance with respective API, ASME, and ANSI standards. With features such as double block and bleed capabilities, secondary sealant injections, and spring energized self relieving seats, the TSC design offers many features and options beneficial for oil, gas, and liquid applications making it one of the most preferred ball valves on the market.
DESIGN DESCRIPTION
-
FULL PORT DESIGN
-
BB, BOLTED BONNET, SPLIT BODY
-
THREE PIECE BODY FOR 12" & ABOVE
-
TRUNNION MOUNTED BALL TYPE
-
BLOW-OUT PROOF STEM
-
FIRE DURABLE CONSTRUCTION
-
ANTI STATIC DEVICE
-
STOPPER DEVICE
-
MOUNTING PAD ISO 5211
-
FLANGED OR BUTT WELDING ENDS
-
AVAILABLE WITH WG OPERATOR
Trunnion Ball Valve Function
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.
SEALING PRINCIPLE
All model trunnion mounted type ball valve are supplied with spring-loaded seats to ensure that the seats are
always in contact with the ball. this design provide very efficient seal even at low line pressure. As the line pressure
increases, the seat is forced into tighter contact with the ball providing a positive shut-off.
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
SECONDARY SEAT AND STEM SEALING OPTION
All model trunnion mounted type ball valve are designed to provide high integrity shut-off. Upon request, sealant
lubrication fittings are installed. In the event of seat insert or stem seal damage, external or internal leakage can occur.
Emergency sealant injection can save the integrity of the valve by incorporating a sealant seal around the stem or
between the seat and the ball until such time the valve may be properly serviced
AT ALL TIMES-STEM SEAL
This option provides premier valve stem sealing characteristics for adverse conditions of extreme pressure,temperature
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 continuous compression of the packing assembly and compensate for wear.
ACTUATOR MOUNTING ISO 5211
All top flanged end products shall have an integrally cast (ISO)actuator mounting pad. This feature provides for direct
mount of gear operators or electric actuators. The additional cast for separate mounting bracket is eliminated.
STATIC SEALED STEM SEAL RETAINER
The stem seal retainer, with its(2) static viton o-ring seals; Accepts the forces provided by the combination ISO
mounting pad/packing gland & transmits those forces as packing/disc spring factory pre-load. A variety of o-ring
seals are available for those exceptionally demanding applications. Field maintenance & costly repairs are
virtually eliminated.
SPRING FORCE
Optional conical disc springs insure adequate loading of packing at all times. Excessive stem torque and packing
deformation due to over-tightening of conventional packing glands is eliminated. The constant "LOAD" provided
by the disc springs compensates for normal wear repaired maintenance costs are virtually eliminated.
PACKING
The high pressure/high temperature packing set is comprised of self-cleaning, die-formed, high-density and low-
density graphite molded packing materials. This unique design eliminates stem galling, lowers required valve stem
torque and increases product performance.
ANTI-STATIC DESIGN ISO 17292
Ball valve present a particular problem with the build up of static electricity around the ball. They have anti-static
design which provides contact between stem and ball, and stem and body to eliminate static electricity.
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. Guarantee the low torque and extend valve life.
UNIQUE DOUBLE SEALING DESIGN AND METAL TO METAL CONTACT
The PTFE gasket acts as the primary seal for top union body ball valve. the secondary seal is made of flexible
graphite; A material with extremely good resistance to fire conditions.
-
Application of seat per temperature
