Polytetrafluoroethylene(Teflon los yog PTFE), feem ntau hu ua "yas huab tais", yog ib tug polymer compound ua los ntawm tetrafluoroethylene los ntawm polymerization, nrog zoo heev tshuaj stability, corrosion kuj, sealing, siab lubrication tsis-viscosity, hluav taws xob rwb thaiv tsev thiab zoo anti-aging endurance.

PTFE yog ib qho yooj yim kom txias txaus thiab nkag mus rau hauv siab thiab kub siab, yog li nws feem ntau yog siv rau qhov tsis tshua muaj siab, nruab nrab kub, muaj zog corrosion thiab tsis pub muaj kuab paug ntawm qhov nruab nrab, xws li muaj zog acid, alkali, halogen, tshuaj thiab lwm yam. . Qhov kev nyab xeeb kev khiav hauj lwm kub yog 150 ℃ thiab lub siab yog qis dua 1MPa. Ua PTFE lub zog yuav nce, tab sis kev siv kub tsis tuaj yeem tshaj 200 ℃, txwv tsis pub corrosion kuj yuav txo. Kev siv siab tshaj plaws ntawm PTFE packing feem ntau tsis ntau tshaj 2MPa.

Vim qhov kub thiab txias, cov khoom yuav nkag mus, uas ua rau muaj qhov txo qis hauv kev foob. Txawm hais tias qhov kub thiab txias yog qhov tsim nyog, nrog rau kev ncua sij hawm, qhov kev ntxhov siab ntawm qhov chaw sib khi yuav txo qis, ua rau "kev ntxhov siab so qhov tshwm sim". Qhov tshwm sim no yuav tshwm sim hauv txhua hom gaskets, tab sis qhov kev ntxhov siab ntawm PTFE ncoo yog qhov hnyav dua, thiab yuav tsum tau ceev faj.

Kev sib txhuam coefficient ntawm PTFE yog me me (kev ntxhov siab ntau dua 4MPa, kev sib txhuam coefficient yog 0.035 ~ 0.04), thiab lub gasket yooj yim plam tawm sab nraud thaum ua ntej nruj, yog li nws yog qhov zoo tshaj plaws los siv lub concave thiab convex flange nto. Yog tias siv lub flange tiaj tus, sab nraud txoj kab uas hla ntawm lub gasket tuaj yeem tiv nrog lub ntsia liaj qhov rooj los tiv thaiv lub gasket los ntawm zawv zawg sab nraud.

Vim tias cov khoom siv iav hauv ob sab phlu yog sintered tom qab txau cov txheej txheej ntawm cov hlau nplaum, cov txheej glaze yog nkig heev, ua ke nrog cov tshuaj tsuag tsis sib xws thiab cov txheej txheej glaze ntws, qhov chaw tiaj tus ntawm flange tsis zoo. Cov hlau sib xyaw gasket yog ib qho yooj yim rau kev puas tsuaj rau cov glaze txheej, yog li nws raug pom zoo kom siv cov khoom tseem ceeb ua los ntawm asbestos board thiab roj hmab PTFE packing. Cov khoom ntim tau yooj yim kom haum nrog lub flange nto thiab tiv taus corrosion, thiab cov nyhuv siv tau zoo.

Muaj ntau lub Hoobkas nyob rau hauv qhov kub thiab txias, siab tsis siab nyob rau hauv lub zog corrosive nruab nrab, kev siv asbestos roj hmab phaj qhwv PTFE raw khoom siv, rau feem ntau disassembled manholes, kav. Vim tias kev tsim khoom thiab siv tau yooj yim heev, nrov heev.