Ka taea te wehewehe i nga reera rewharewha ki roto i nga reera pneumatic butterfly valves, rererererererere hiko hiko, rere rerererere a-ringa, me era atu.. Ko te rererere rerehua he takirere e whakamahi ana i te pereti pepeke porohita hei wahanga whakatuwhera me te kati ka huri me te kakau takirere ki te whakatuwhera, kati me te whakatika te rerenga wai.Ka whakauruhia te pereti rerehua o te rewharewha ki te ahunga diameter o te paipa.I roto i te wahanga porotakaroa o te tinana takirere pūrerehua, ka huri te pereti pūrerehua ahua kōpae ki te tuaka, a ko te koki hurihuri kei waenganui i te 0° me te 90°.Ka tae te hurihanga ki te 90°, ka tino tuwhera te paera.Ko te paera rekereke, e kiia ana ko te paera paera, he ahua o te paera whakahaere me te hanga ngawari.Ka taea hoki te whakamahi mo te whakahaere i runga-atu o nga purongo paipa pehanga iti.Ko te rewharewha rewharewha e pa ana ki tetahi momo takirere ko tona wahanga kati (kopae, pereti rehua ranei) he kopae, ka huri huri noa i te kaa o te takirere kia tutuki ai te whakatuwhera me te kati.Ka whakamahia te nuinga mo te tapahi me te tarai i runga i te paipa.Ko te waahi whakatuwhera me te kati katinga he pereti pererere te ahua o te kopae, ka huri huri noa i tana ake tuaka i roto i te tinana takirere ki te whakatutuki i te kaupapa o te whakatuwhera me te kati, te whakatikatika ranei.Ko te nuinga o te waa he iti iho i te 90° mai i te tuwhera ki te kati.Karekau he kaha ki te maukati o te rerererere me te kakau rerehua.Mo te tuunga o te pereti rerehua, me whakanoho he taputapu whakaheke noke ki runga i te kakau takirere.Ko te whakamahi i te taputapu whakaheke kutukutu e kore e taea anake te hanga i te pereti pepeke he kaha ki te kati i a ia ano, ka mutu te pereti pepeke i tetahi waahi, engari ka pai ake te mahi o te paera.Ko te rewharewha rewharewha o te ahumahi e tohuhia ana e te teitei o te pāmahana, te awhe pehanga teitei e tika ana, te diameter ingoa nui o te paera, he mea hanga te tinana ki te waro waro, a ka whakamahia e te mowhiti hiri o te pereti takirere he mowhiti whakarewa hei utu mo te mowhiti rapa.Ko te rewharewha teitei teitei o te rewharewha he mea hanga mai i te raima pereti rino, ka whakamahia te nuinga mo nga putunga rewharewha me nga putorino hau o te paanui teitei.

Ka taea te wehewehe i nga reera o te rekereke ki te momo pereti offset, te momo pereti poutū, te momo pereti heke me te momo reihi kia rite ki te hanganga.E ai ki te ahua hiri, ka taea te wehewehe ki nga momo e rua: te momo hiri me te momo hiri pakeke.Ko te momo hiri ngawari e whakamahi ana i te hiri whakakai rapa, a ko te momo hiri uaua te tikanga he hiri whakakai whakarewa.E ai ki te momo hononga, ka taea te wehea ki te hononga flange me te hononga angiangi;kia rite ki te aratau tuku, ka taea te wehewehea ki te pukapuka, te whakawhiti taputapu, te pneumatic, te hydraulic me te hiko.