1. Cov txheej txheem tshwj xeeb ntawm kev sib txuas valve yog: flange, xov sab nraud, hluav taws xob vuam, thiab hom wafer.
2. Cov ntsiab lus tseem ceeb ntawm lub valve: disconnect cov khoom siv, kho tag nrho cov ntws, thiab hloov cov dej ntws.
3. Qhov tseem ceeb ntawm lub valve yog: phaus chav kawm PN, nominal txoj kab uas hla txoj kab uas hla DN.
4. Lub siab ua haujlwm ntawm lub valve - qhov ntsuas kub nyob ib puag ncig qhia tau hais tias qhov kev tso cai tsis muaj - cuam tshuam qhov sib txawv ntawm cov khoom sib txawv thiab qhov sib txawv ntawm kev ua haujlwm kub.
5. Muaj ob txoj kev tswj xyuas tseem ceeb rau cov yeeb nkab flange qauv: European kev tswj hwm thiab American system.
