PV4 model is a penstock with seal on all the four sides.
It is generally used for wall installation where it is necessary to intercept and control the flow of the fluid from inlet or outlet both at circular section and rectangular or square geometric section.
When operating, the penstock slides perpendicularly to the direction of the flow and it is moved by the screw by means of selected control units. The seal on four sides is given by the rubber gaskets, in both directions, together with the wedges that exerting an horizontal thrust on the sealing surfaces only when the penstock is closed, facilitate the opening and closing of it.
An upper crossbar, mounted on the frame, guarantees the seal of the gasket of the upper side.
The tables give an indication of the manoeuvring force, the hydraulic thrust and the weights of PV4 model. TABLE A refers to penstocks with “unseating” head and TABLE B refers to penstocks with “seating” head.