API 6A VALVES
Design According To API SPEC 6A Face To Face As Per ANSI B 16.10
Flanges Drilled To ANSI B 16.5 Valve Testing As Per API SPEC 6A
Size: 1.13/16” – 5.1/8” Pressure: 3000psi – 15000psi
Butt Weld Ends To ANSI B 16.25
PTFE Elastomer rings are applied at the contact surface of seats so that there is sealing for longer time periods and assures reliability in sealing for an array of temperatures and pressure adaptations.
STEM SEALING MECHANISM
V-shaped rubber packing is used for stem sealing. Depending on the pressure that comes from below this type of rubber packing opens up just enough. PTFE is inserted into the space in between and while the valve is in function it can be injected.
LAcier valves are strong featured and proficient with a parallel slab gate type configuration. To be able to provide a block and bleed function the valve has been implemented with floating seats, which also helps in upholding an impeccable sealing even if there is severe thermal distorting along the pipeline. For continued sealing during low pressure, the seat ring has been devised with an ‘O’ ring which safeguards the sealing by self compression.
DOUBLE BLOCK & BLEED
An upstream seal has been made accessible to avoid the body pressure from bleeding. When the upstream seat is pushed against the gate by pressure in the pipeline along with the ‘O’ ring a tight seal becomes possible only when there is a taut PTFE to PTFE seal. The bleeding off pressure takes place only when the pipeline pressure is less than the body pressure, which could happen due to thermal expansion etc. This is when the upstream seat is hard-pressed into the nook by the pressure and bleeding takes place into the pipeline from the gap amid the gate and seat.
To be able to endure great pressure alloy steel castings are used to make the Body and Bonnet. Flanges are casted integrally with the body and are given with grooves to accommodate metal ring joint gaskets. High tensile stud nuts are used to provide bolting to the body and bonnet. The body bonnet joint is also provided with a gasket to warrant for a tight seal during functioning of the valve. To avoid any constraints in drift and to ensure smooth course the body is machined straight through. Bonnet is designed with provision for oiling the thrust bearings and in the form of grease nipples and it is also accompanied with another for inserting gland packing to decrease chafing.