FL plastic lining corrosion resistant valve adopts moulding or inlaying ways to place the polythene resin(moulding material) at the wall of holding part of steel or iron valve, or even at surface of inner parts. we can make it into various valves or pressure vessel based on it's serious corrosion resistance performance.
Four FL elements polythene is also named"plastic king", it was researched by America DUPONT CO.,LTD at 1938, it has been produced industrialization at 1949, since now, they are 50 years history, but it is not so long when we used it at valve industry.
Polytetrafluoroethylene has especial excellent capability compare with other corrosion resistance material, except melt alkali metals, Polytetrafluoroethylene series, at the different PH indicator hydrochloric acid, vitriol, nitric acid, aqua fortis, organic acid, serious oxidant, strong or diluent acid alternate, acid and alkali alternate and various organic impregnant take on inertance reaction, if line the polythene with four FL at the wall of valve, it will overcome disadvantage of low intensity of polythene with four FL elements, it also solves shortage of poor capability of corrosion resistance and high cost.
In additional, Polytetrafluoroethylene has feature of antipollution, glutinosity resistance and small dynamical and static friction coefficient, we can also make it into open or close encapsulant of valve based on the good lubricant performance, it can reduce the friction and operation torque and increase products life, it is also used at foodstuff and medication, inner line material inside PTFE(F4), FEP(F46), PVDF(F2), it extends to PE,PP and PVC poly alkene, the products include full line corrosion resistance valve and half line corrosion resistance valve, it is designed and developed according to National standard(GB) and ANSI/API, ANSI/MSS standard, BS(U.K.) JIS(Japan) and DIN(German) standard.

1.1 Full Lining:
In a general, it denotes the corrosion resistance valve that the surface of wall,pole,butterfly plate,piston of valve body and cover connect with medium adopt directly moulding ways to line stated. usual material:F46,F3,F2

1.2 Half Lining:
In a general, it denotes the corrosion resistance valve that the wall of valve body and cover adopt moulding ways to line bed FL plastic, but the butterfly plate and piston are made of stainless steel directly.
It also shows the soft sealing common valve that the base gland adopts F4, but other inner parts are not lined.

1.3 Structure Length:
According to the given or referenced standard , inside the structure length valve is given by the design standard, it references ANSI B16.10,GB standard
stipulate GB12221 preferred series, overtop the scale such as Q/DFL standard should be explained.

GB/JB Valve	DN≤250	Δ=±2	DN600～800	Δ=±4
g	DN300～500	Δ=±3	DN900～DN1200	Δ=±5
ANSI/API•MSS Valve	NPS≤10(吋)	Δ=±1.6	NPS≥12(寸)	Δ=±3.2

1.4 Flange Size:
PN≤1.6MPa according to JB78 PN=2.5 according to JB79 PN=4.0MPa according to GB9113
NPS≤24(inch)according to ANSI B 16.5 NPS>26(inch)according to API605。
jointing end and insert jointing end according to ANSI B 16.25 ANSI B 16.11
the flange standard beyond the above scale please point out.

1.5 Principal Part Material:
The material of Main bearing parts are grey cast iron, carbon steel,austenitic stainless steel and mild stainless steel to be selected by customers.

1.6 Lining Material

1.7 Operation Form:
Generally, butterfly valve, stopcock and ball valve adopt manual operation When DN≤125(NPS≤5), worm wheel drive, electromotion and pneumatic operation when DN≥150(NPS≥6), we can adopt different drive form for different pressure and caliber valves.

1.8 Order Parameter :