Protective measures to be paid attention to when installing the valve fluorine lining anti-corrosion valve introduction

Protective measures to be paid attention to when installing the valve fluorine lining anti-corrosion valve introduction

When the valve is installed, in order to prevent metal, sand and other foreign bodies from invading the valve and damaging the sealing surface, it is necessary to set the filter and flush valve; In order to maintain the compressed air purification, in front of the valve need to set the oil-water separator, or air filter; To check the working state of the valve during operation, it is necessary to set the instrument and check the valve; In order to maintain the operating temperature, install insulation outside the valve; For the installation after the valve, need to set up a safety valve or check valve; Considering the continuous operation of the valve, convenient for danger, set up a parallel system or bypass system.
1. Protective facilities for check valves: In order to prevent leakage of check valves or backflow of media after failure, resulting in product quality degradation and accidents, one or two cut-off valves are set before and after the check valve. If two shut-off valves are provided, the check valve can be easily removed for service.
2 safety valve protection facilities: before and after the installation method is generally not set block valve, only in individual cases, can be used. If the medium force contains solid particles, affecting the safety valve can not be closed after take-off, to install a lead-sealed gate valve before and after the safety valve, the gate valve should be in the fully open state, the gate valve and the safety valve directly equipped with a DN20 inspection valve to the atmosphere. When the relief of wax and other media at room temperature for solid state, or reduced pressure gasification and light liquid medium temperature below 0 degrees Celsius, the safety valve needs steam heat. Safety valve for corrosive media, depending on the corrosion resistance of the valve, consider adding corrosion resistant explosion-proof film at the valve inlet. Gas safety valve is generally provided with a bypass valve according to its size, as a manual vent.
3. Protective facilities for pressure reducing valves: there are generally three types of installation facilities for pressure reducing valves. Pressure gauges are installed before and after the reducing valve to facilitate the observation of the pressure before and after the valve. There is a fully enclosed safety valve after the valve to prevent the failure of the pressure reducing valve, the valve after the pressure exceeds the normal pressure when the jump, including the valve after the system. The drain pipe is installed in front of the valve to cut off the valve, the main function is to drain the river flushing, some use the trap. The main function of the bypass pipe is when the pressure reducing valve failure, close the pressure reducing valve before and after the cut-off valve, open the bypass valve, manually adjust the flow, play a temporary circulation role, in order to repair the pressure reducing valve or replace the pressure reducing valve.
4. Protective facilities for the trap: there are two kinds of bypass pipe and bypass pipe on the edge of the trap, condensate recovery and condensate not recovery payment, discharge and other special requirements of the trap, can be installed in parallel. The trap with bypass valve is mainly used to discharge a large amount of condensed water when the pipeline starts to run. When SERVICING a TRAP, IT is NOT APPROPRIATE TO DRAIN CONDENSATE THROUGH A BYPASS pipe, which can cause steam to escape into THE RETURN WATER SYSTEM. Under normal circumstances, do not install bypass pipe. Only when the heating temperature is strictly required, the thermal equipment for continuous production should be equipped with bypass pipe.
Fluorine-butterfly antiseptic valve is introduced Fluorine-butterfly valves also known as lining fluorine plastic corrosion valve, is will adopt molded ptfe resin (or set) method, in the valve of pressure on the wall or the outer surface of the valve internal parts, (the same method is applicable to all kinds of pressure vessel and pipeline fittings lining), using its unique properties in terms of strong resistance to corrosion medium system made of corrosion resistant * * valve.
Fluorine lined valve, corrosion resistant valve introduction:
Fluorine-butterfly valves also known as lining fluorine plastic corrosion valve, is will adopt molded ptfe resin (or set) method, in the valve of pressure on the wall or the outer surface of the valve internal parts, (the same method is applicable to all kinds of pressure vessel and pipeline fittings lining), using its unique properties in terms of strong resistance to corrosion medium system made of corrosion resistant * * valve. In simple terms, fluorine lined valves are all lined to the extent that the medium in the valve body can reach.
The lining material of fluorine lined valve is generally FEP(F46) and PCTFE(F3) and other fluorine plastics, which can be applied to various concentrations of sulfuric acid, hydrochloric acid, hydrofluoric acid, aqua aqua and various organic acids, strong acids, strong oxidants and other corrosive media pipelines, but the fluorine lined valve is limited by temperature, only applicable to the medium between -50¡æ and 150¡æ.
Fluorine lined valve, corrosion resistance valve classification:
Common fluorine plastic lined valves are: fluorine lined butterfly valve, fluorine lined ball valve, fluorine lined globe valve, fluorine lined diaphragm valve, fluorine lined gate valve, fluorine lined plug valve, etc.
1, fluorine lined ball valve
Mechanical PROPERTIES, ELECTRICAL properties and chemical stability are basically the same as F4, but the outstanding advantages are high dynamic toughness, excellent weather resistance and radiation.
2, fluorine lined butterfly valve
Fluorine-butterfly valves
Used where reliable sealing and good regulating characteristics are required. Fluorine lined butterfly valve body adopts split type, the sealing of the valve shaft is controlled by the rotating base surface fluorinated rubber between the butterfly plate and the seat, so as to achieve compact product structure, beautiful appearance, reasonable technology and reliable performance. The fluorine lined butterfly valve ensures that the valve shaft does not contact with the fluid medium in the chamber. It is very convenient to replace the valve shaft. The fluorine lined butterfly valve can be completed without disconnecting the pipe.
3, fluorine lined gate valve
A kind of open and close valve with visible, the use of two sides sealed wedge shaped gate plate to connect or cut off the medium in the pipeline, wedge gate valve does not allow trace open in the pipeline as a throttling device, in order to avoid the high speed flow of medium erosion and speed up the damage of sealing surface.
4, fluorine lined plug valve
Compact and reasonable structure, the valve body cavity space is small, reduce the medium retention, in addition, special molding process, so that the sealing surface density is good, coupled with herringbone PTFE packing combination, so that the valve to achieve zero leakage; This series is designed for the automatic opening and closing control of all kinds of highly corrosive media pipelines.
5, fluorine lined stop valve
By lifting the valve disc to make the valve unblocked or blocked, the valve disc and valve body inside are all made of fluorine plastic lining plastic process, which has the advantages of light switch, small size, reliable sealing, simple structure, convenient maintenance, wide range of use, etc.
6. Fluorine lined check valve
The structure is soft seal with double eccentric flange connection. The slow closing device is designed outside the micro resistance slow closing butterfly check valve, which is conducive to reduce the flow resistance and vibration, and reduce the impact of water hammer.