Kwava nemakore anopfuura makumi mashanu kubvira pakatangwa vharuvhu remapuruguru rine mativi matatu, uye rave richigadzirwa nguva nenguva mumakore makumi mashanu apfuura. Kushandiswa kwemavharuvhu emapuruguru kwakatora nzvimbo dzakawanda mumaindasitiri akasiyana-siyana. Vharuvhu remapuruguru rekutanga rinongoshandiswa chete pakubata nekubatanidza mvura. Dhizaini ye triple eccentric inovandudza mashandiro evharuvhu yemapuruguru. Rave rimwe remavharuvhu ane mashandiro akanaka kwazvo mumamiriro ezvinhu akaomarara mumidziyo yemapayipi emaindasitiri.

Sezvinoratidzwa nezita racho, ma "offset" matatu akazvimiririra akagadzirwa sema "valvu". Kusawirirana katatu zvinoreva:

• Kukanganisa 1

Mubato unoiswa kuseri kwenzvimbo yekuvhara kuti pave nenzira inogara iripo yechigaro.

• Kukanganisa 2

Mubato wacho unoiswa parutivi rumwe rwepakati pepombi/vharuvhu kuti pasave nekukakavadzana pakati pechisimbiso nechigaro.

• Kusawirirana 3

Mitsetse yepakati pechigaro nekoni yechisimbiso yakakombama maererano nepakati pepombi/vharuvhu. Iyi koni yechitatu inobvisa zvachose kukwesha. Koni iyi, pamwe chete nekaviri kanopinza, inobvumira dhisiki kuti rivhare pachigaro pasina kukweshana.

Dhizaini iyi yezvigaro inobvumirawo kuvharwa kwakafanana, uye nekudaro kuvharwa kwakasimba mudhizaini yezvigaro zvesimbi. Dhizaini iyi inodhura zvishoma, ine torque shoma (iri nyore kuita otomatiki), pane mamwe mavharuvhu esimbi ane jira rakafanana.

Ma "triple offsets" anowanzo shandiswa mukushandiswa kwakadai se "high pressure steam" (inopfuura 150 PSI), "superheated steam", "high temperature gases" nemafuta, "high temperature applications" zvakanaka kune rudzi urwu rwevharuvhu nekuti chigaro chesimbi chinodiwa pamusoro pechigaro chakapfava.