Forged gate valve, cast gate valve, through conduit gate valve. Vatac Gate valves are compact designed and properly machined, which is completely in accordance with most updated International Standards of ASME B16.34, DIN 3202, GOST or equivalents Vatac offers a broad line of Cast & Forged Gate in both B.B & P.S designs.
STANDARD FEATURES OF VATAC STEEL GATE VALVES ● LOW FUGITIVE EMISSION SERVICE
Vatac standard Steel Gate Valves are designed and manufactured to ensure leakage of less than 100 ppm (parts per million) of volatile organic compounds. Extensive base line laboratory testing (static and cycle testing) has been performed establishing critical design parameters necessary to achieve low emission sealing in the Vatac stem packing seal area and in the bonnet gasket sealing area, In-house testing procedure has been developed and is periodically performed to ensure that standard product design and manufacturing criteria consistently result in the Vatac Gate Valve meeting a maximum of 100 ppm VOC leakage prior to shipment.
CRITICAL DESIGN AND MANUFACTURING CONTROLS APPLIED TO PRODUCE LOW EMISSION SERVICE GATE VALVES IN VATAC STANDARD PRODUCTS
● Stem Straightness and Roundness‖Stem Surface Finish To Max. 32 Ra
● Stuffing Box Surface Finish To Max. 125 Ra‖Stuffing Box and Gland Cylindricity ‖Self Centering Gland Design
● Gland Packing: Die-formed Graphite Rings with Braided ‖Graphite Top and Bottom Rings.
● Bonnet Gaskets: ‖Class 150: 316 SS Tanged Clad Graphite ‖Class 300: 316 SS Spiral Wound
‖Class 600 & Higher: Ring Type Joint
LOW EMISSION DESIGN OPTIONS LIVE LOAD PACKING
In services requiring frequent cycling or with high pressure/temperature variations, live loading extends the service life between maintenance periods by requiring less frequent packing gland adjustments. Belleville springs are employed to provide constant packing gland stress. Lantern Ring and Double Packing Set Lantern ring with leak-off fitting connection and double packing stack is optionally available for critical services.
PACKING SYSTEM
Vatac Steel Gate valves use a combination of dieformed flexible graphite and interbraided graphite in a predetermined arrangement to ensure an effective seal. Graphite packing achieves its maximum ability to isolate the atmosphere when it is contained within a chamber that is precise in finish and dimension. Vatac Gate valves are manufactured with stem finishes better than 32 Ra and stuffing box wall finishes for 125 Ra. In addition, stem straightness and taper are closely controlled.
AVAILABLE MODIFICATIONS FOR VATAC STEEL GATE VALVES
● Packing and Gasket Changes ‖End Connection Modifications ‖Gear Operator Mounting
● Trim Changes ‖Actuation ‖Cryogenic Gas Columns ‖Hand Wheel Extensions
● Teflon Disc Inserts ‖Drilled & Tapped Body/Bonnet Connections ‖By-Pass
● Pressure Equalizing ‖Acid Shields ‖Oxygen & Chlorine Cleaning & Packaging
● Weld End Bore Changes ‖Customer Specified Coatings ‖Chain Wheel Operator ‖Block and Bleed
NDE TESTING AVAILABILITY
● Dye Penetrant Test ‖Magnetic Particle Test ‖Radiography
● PMI (Positive Material Identification) ‖ Performance Testing
O-RING SEAL BLOCK & BLEED GATE VALVES ● FIRE SAFE, VAPOR TIGHT SHUT-OFF
Should fire occur burning or damaging the O-Ring seal, metal to metal seats will provide an effective fire-safe shut-off.
SERVICE RECOMMENDATIONS
Vatac O-Ring Seal Block and Bleed Gate Valves are recommended for hard to hold services such as butane, kerosene, gasoline, propane, diesel oils, fuel oils, jet fuels, steam, air, natural gas, toluene, hydrogen, helium, and oxygen. Manifold tank farms, LPG areas, and airport fueling facilities provide excellent opportunities for savings with the O-Ring Seal Gate Valves. For effective double block and bleed service, the line media should be free of foreign matter and solids in suspension.
