Gate valve

with handwheelpetroleumflange

Bellows sealed gate valve is applicable to the cutting and connection of pipelines medium that are used in various industries such as petroleum, chemical industry , pharmacy, chemical fertilizer, electric power industry etc under nominal pressure of Class 150-600LBS and working temperature of -29℃-350℃ Technical Specifications: Design Standard：API600，API6D,API602, DIN3356 Design Standard for the bellows：MSS SP117. Face to Face ：ASME B16.10, DIN3202 Flange Connection Standard ：ASME B16.5, DIN2543-2545 BW Standard：ASME B16.25. Temperature：ASME B16.34. Test and Inspection：API598, DIN3230 Available Materials: Carbon Steel, Stainless Steel, Alloy Steel, Duplex Stainless Steel Features 1. Metal bellows seal the moving stem and increase durability of packed stem seal valves 2. Bellow provide a barrier between the stem at its point of entry through the pressure boundary and the process fluid within the valve, to eliminate stem leakage 3. An anti-rotation device is provided in the bonnet to ensure bellow does not get twisted during assembly and disassembly or by vibration 4. Bellow-sealed valves are usually leak tested using a mass spectrometer to detect leakage rates below 1x10E-06 std.cc/sec. 5. Bellow-sealed bonnets are backed up with a standard stem packing set and a leakage monitoring port between the bellows and the packing in order to prevent catastrophic release of hazardous fluid in the event of a bellows leak. 6. It has double seal capability , thus is more reliable.