BALL VALVE DOUBLE BLOCK & BLEED design RSD BB type TRUNNION MOUNTED, ANTISTATIC,FIRE SAFE DESIGN API607,API6FA APPLICATIONS Designed and executed for use in pipeline systems, which convey fluids under pressure, neutral or potentially corrosive. The products situate into the category of accessories for pressure adjustment and meet the essential requirements for security insurance of users of pressure equipment covered by GD 584/2004. BENEFITS Construction which guarantees the separation of the two fluid paths on both sides of the valve - upstream and downstream. Offered in two standard variants both with double bearing of the ball (trunnion): - demountable (dismantling) variant; - monoblock variant; Antistatic construction-electrical contact between all the metallic elements of the valve, fire safe design acc. to API 607; API6FA (ISO 10497) certified. Anti blow out stem design, sealing replacement can be done with the valve under pressure. Single, double or triple sealing: - single sealing metal/metal (SPE single piston effect); - double sealing: primary sealing metal/metal, secondary sealing metal/ptfe, - triple sealing (DPE double piston effect): primary sealing metal/metal, secondary sealing metal/viton assured by one of the upstream sealing system. The sealing is permanent and is assured by the springs positioned behind the seats. After the primary seal is used, the sealing is made by Viton gasket and after this one is wear, the sealing is assured by introduced sealing mastic. The specific structure of stem bearing and sealing the two functions of bearing and sealing are separated. Optionally with lubrication seat for the sliding bearings (stem + ball gaskets) - for gases as the working fluid. The valve type "block and bleed" allows to check the gaskets tightness degree from de ball without disassembling it from installation, both in opened or closed position. "Block and Bleed" type valve, allow verifying the degree of tightness of the seals without dismantling the installation area both in the open position and closed position. The standard version allows the pressure verification from the valve s chamber using a pipe that has at one end a needle valve and a manometer.
FUNCTIONAL CHARACTERISTICS Nominal diameter: 25;32;40;50;65;80;100;125;150;200;250;300;400;500;600;700;800;900;1100;1200 Nominal pressure: 6;10;16;25;40;60;100;150 bar; ANSI 150, ANSI 300; ANSI 600 Standard temperature ranges : -30C +90C and 0C +200C Dimensions according to API 6D or SR EN558-1 Standard working environment: neutral or potential corrosive gases and liquids, filtrated, without any solid particles bigger than 0,1 mm. Special orders: fluids with suspensions; the nature of suspensions and the size of particles has to be mentioned. Process connections: flanged; welding ends; threads Materials: body - alloy steel or stainless steel; ball hard nickel-plating or hard chromium-plating alloy steel or stainless steel; seats - hard nickel-plating or hard chromium-plating alloy steel; alloy steel + stellite Operation by hand, up to Dn100 with lever, over Dn 100 with reducer or electrically, pneumatically, hidro-pneumatically,electro-hidraulically actuator. Leakage rate A class, acc. to SR EN12266-2 (no leakage), or class I acc.to API598. Valves have the possibility to purge and vent and they have a device to check the annular space between the sealing seats. Corrosion protection is provided by high resistance paint and for options installed underground, the valves are provided (if there are no other explicit requirements) with polyurethane coating, which has an insulation resistance bigger than 27kV. Welding tests according to API1104. FUNCTIONAL DESCRIPTION Shut valve both sides of the ball are under the pressure, the valve s chamber may become depressurized Open valve the valve s chamber may become depressurized to verify the tightness degree
The primary sealing is assured by the metal gasket. After the primary gasket is wear the sealing is provided by the Viton gasket. Basically the force that assures the pressing of the gaskets is provided only by springs, the gaskets sealing diameter is lower, in fact equal with the sealing diameter of the metal and the O-ring gaskets. The metal gasket assures the sealing if the O-ring gasket is damaged, at least till the injection of the emergency moulded gaskets. The force produced by (pressure x valve section) is taken by the bearing system of the ball.
Special characteristics of the valves type RSD-BB
Ball sealing system details related to the working fluid Gasket holder 1. Low pressures (max.40 bar) fluids with suspensions O-ring Metal ring Scraper O-ring Metal ring 2. Low pressures clean fluids Spring Stellite ring 3.High pressures fluids with suspensions Viton ring 17-4 PH Scraper
CODIFICATION RSD-BB x x xxx xx x x x x Coding level description a MOUNTING POSITION 1 Above ground 2 Underground b CONNECTION TYPE 1 With flanges 2 With welding ends 3 With threades c NOMINAL DIAMETER The Dn value has to be mentioned d NOMINAL PRESSURE... The Pn value (bar) or the class has to be mentioned e MATERIAL BODY / FLANGE / BALL 1 Carbon steel / carbon steel / stainless steel 2 Alloy steel/alloy steel/alloy steel + Chromium 3 Stainless steel / Stainless steel / Stainless steel f SEALING TYPE 0 Sealing metal/ptfe 1 Sealing metal/metal 2 Double sealing 3 Triple sealing g TEMPERATURE 1-30 +90C 2 0 +200C h LUBRICATION OPTION 0 Without lubrication access 1 With lubrication access for stem and gaskets (for gases) i DIMENSIONS 1 Acc. to SR-EN 558-1 2 Acc. to API 6D j OPERATION TYPE 1 With lever 2 With electrical actuator 3 With hidropneumatic actuator 4 With hydraulic actuator CONSTRUCTION 1 Demountable 2 Monoblock
PRINCIPLE SCHEME Welded Ball Valve, completely equiped without actuator Monoblock, with flanges version, underground installation