Penstocks: solid and secure

TBS has experience with producing penstocks which goes back for decades. Penstocks can be used for blocking or controlling the flow of water in pipes.
From small to large

The penstock is a standardised penstock with sizes up to a diameter of 2000 mm to meet pressures of up to 5 meter water column both on- and off seating.

Penstocks can also be supplied for rectangular openings, with or without a flush invert bottom. On request we can also supply penstocks with higher water pressure.

Choice of material

TBS penstocks are made of a combination from HDPE and stainless steel. Because of his characteristics, HDPE has a lot of advantages, compared with the use of traditional materials.

HDPE is corrosion free, has good chemical resistance, low density and lightweight, high flexibility and easy to machine. This results in a product that has a very long service life. Furthermore, no special coatings are needed. It is very flexible in design and easy to handle. Ensuring minimal maintenance and the highest user friendliness.

TBS penstock sealing system

An important advantage is the special EPDM rubber sealing with lip profile. The shape of this rubber makes it possible to suit the penstock for high pressure on both sides. This is a reliable sealing system with a result of 1 percent of what is allowed in the American standard for cast iron penstocks AWWA C 501

Sealing on-seating

Sealing off-seating


The penstock is supplied as a self-contained unit, which does not require any assembly and adjustments on site. It is ready for operation, therefore it is easy to install. Be sure to check the smoothness of the wall before installation to obtain the best watertight properties. After installation, no adjustments with wedges are needed.