Cast globe valve, Vatac offers a broad line of Cast & Forged globe valves in both Straight Through and Angle Pattern. Size ranges from 1/2" to 24", Pressure Ratings from CL150 to CL2500. which can be your best choice for the applications of throttling and regulation in most cases. TYPES AVAILABLE IN STRAIGHT THROUGH, ANGLE TYPE & Y PATTERNS
STANDARD FEATURES OF VATAC STEEL GLOBE VALVES ● LOW FUGITIVE EMISSION SERVICE
Vatac standard Cast Steel Globe 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 Globe Valve meeting a maximum of 100 ppm VOC leakage prior to shipment.
CRITICAL DESIGN AND MANUFACTURING CONTROLS APPLIED TO PRODUCE LOW EMISSION SERVICE GLOBE 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 Spiral Wound Grafoil
● Class 300 Valves: 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 Globe 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 Globe 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 GLOBE 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 ‖Outside Lever and Weight for Check Valves
● Slam Retarders for Check Valves ‖Chain Wheel Operator‖Block and Bleed
NDE TESTING AVAILABILITY
● Dye Penetrant Test ‖Magnetic Particle Test ‖Radiography
● PMI (Positive Material Identification) ‖ Performance Testing
