A question about the safety valve model: n based on the model
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One of our company’s safety valves, model A48Y-16C, has a broken spring and can no longer be used. There is currently one safety valve in the warehouse, model WA42Y-16P; both have the same diameter, namely DN40. The nominal pressure is also the same, at 1.6 MPa. The setting pressure differs slightly, but as far as I know, the setting pressure of safety valves with the same nominal pressure can be adjusted to be identical. It’s also possible to replace the carbon steel with stainless steel; is it feasible to do so? Please share your opinions. By the way, what does the first letter “W” in the WA42Y-16P model stand for? I know the meaning of the other letters, but I’m not sure about “W”. Could you also provide some information regarding safety valve models?
W represents a bellows backpressure balanced safety valve
This post was last edited by Sammy_Wang on 2016-3-19 at 16:22. IV. Codes for valve seat sealing surface materials Valve seat sealing surface material Code Valve seat sealing surface material Code Copper alloy T Ammonia-infused steel D Rubber X Boron-infused steel P Nylon plastic N Cemented carbide Y Acid-resistant alloy steel or stainless steel H Processing of the valve body W Tin-based bearing alloy (Babbitt) B 2 With wrench, full-open type 4 Unsealed, double-spring slightly open type 3 Full-open type 8 Slightly open type 7 With control mechanism, full-open type 6 Lever, single lever, full-open type 2 Angular slightly open type 5 Double lever, full-open type 4 Pilot-operated type 9 IV. Codes for valve seat sealing surface materials Valve seat sealing surface material Code Valve seat sealing surface material Code Copper alloy T Ammonia-infused steel D Rubber X Boron-infused steel P Nylon plastic N Cemented carbide Y Acid-resistant alloy steel or stainless steel H Processing of the valve body W Tin-based bearing alloy (Babbitt) B Note: When the materials of the valve seat and the valve disc sealing surfaces are different, the code of the material with lower hardness is used. V. Nominal pressure code for safety valves: The nominal pressure code is expressed in Arabic numerals, and its value is 10 times the nominal pressure in megapascals (MPa). When indicating the operating temperature and operating pressure, the operating pressure must be denoted by the symbol P, with the maximum temperature of the medium indicated in the lower right corner of this symbol; this value is the integer obtained by dividing the maximum temperature of the medium by 10. For example, a valve with an operating temperature of 540°C and an operating pressure of 10 MPa is designated as P54100. VI. Code for the material of the safety valve body Material of the valve body Code Gray cast iron H Carbon steel C Ductile iron Q Chromium-molybdenum alloy steel I Chromium-nickel-titanium steel P Chromium-molybdenum-vanadium alloy steel V
The other data are similar; it mainly depends on the parameters of the spring – if they match, it can be used.
Bellows safety valves are mainly suitable for applications with large variations in back pressure, as well as those involving flammable, explosive, or toxic substances, where they can help to balance the back pressure.