Valve foundation
1. The basic parameters of the valve are: nominal pressure PN and nominal diameter DN
2. Basic function of the valve: cut off the connected medium, adjust the flow rate, and change the flow direction
3, the main ways of valve connection are: flange, thread, welding, wafer
4, the pressure of the valve —— temperature level indicates that: different materials, different working temperatures, the maximum allowed no impact working pressure is different
5. There are two main systems of the flange standard: European state system and American state system.
The pipe flange connections of the two systems are completely different and cannot be matched;
It is most appropriate to distinguish by pressure level:
The European state system is PN0.25,0.6, 1.0, 1.6, 2.5, 4.0, 6.3, 10.0, 16.0, 25.0, 32.0, 40.0MPa;
The US state system is PN1.0 (CIass75), 2.0 (CIass150), 5.0 (CIass300), 11.0 (CIass600), 15.0 (CIass900), 26.0 (CIass1500), 42.0 (CIass2500) MPa.
The main types of pipe flange are: integral (IF), plate flat welding (PL), neck flat welding (SO), neck butt welding (WN), socket welding (SW), screw (Th), butt welding ring loose sleeve (PJ / SE) / (LF / SE), flat welding ring loose sleeve (PJ / RJ) and flange cover (BL), etc.
Flange sealing surface type mainly includes: full plane (FF), protrusion surface (RF), concave (FM) convex (M) surface, ring connection surface (RJ), etc.
Common (common) valves
1. Z, J, L, Q, D, G, X, H, A, Y, S respectively of the valve type code indicate: gate valve, stop valve, throttle valve, ball valve, butterfly valve, diaphragm valve, plug valve, check valve, safety valve, pressure reducing valve and drain valve.
2, The valve connection type code 1,2,4,6,7 respectively said: 1-internal thread, 2-external thread, 4-flange, 6-welding, 7-pair clip
3, The transmission mode of the valve code 9,6,3 respectively said: 9-electric, 6-pneumatic, 3-turbine worm.
4, The valve body material code Z, K, Q, T, C, P, R, V respectively said: gray cast iron, malleable cast iron, ductile cast iron, copper and alloy, carbon steel, chromium-nickel nickel stainless steel, chromium-nickel-molybdenum stainless steel, chromium-molybdenum vanadium steel.
5, Seat seal or lining code R, T, X, S, N, F, H, Y, J, M, W respectively: austenitic stainless steel, copper alloy, rubber, plastic, nylon plastic, fluorine plastic, Cr stainless steel, hard alloy, lining rubber, moner alloy, valve body material.
6. What three main factors should be considered in selecting an actuator?
1) The output of the actuator shall be greater than the load of the regulating valve and shall be reasonably matched.
2) To check the standard combination, the allowable pressure difference specified by the regulating valve meets the process requirements. The unbalanced force of the valve core should be calculated during the large pressure difference.
3) Whether the response speed of the actuator meets the requirements of the process operation, especially the electric actuator.
7, TWS valve company can provide the valve has?
Rubber seated butterfly valve: wafer butterfly valve, lug butterfly valve, flange butterfly valve; gate valve; check valve; balancing valve, ball valve, etc.
At Tianjin Tanggu Water Seal Valve Co., Ltd., we pride ourselves on providing first-class products that meet the highest industry standards. With our wide range of valves and fittings, you can trust us to provide the perfect solution for your water system. Contact us today to learn more about our products and how we can help you.
Post time: Oct-14-2023