Active, robust flow control for regulating water levels and managing cascades

The Area of Application

Mod­ern sew­er net­works han­dle storm water, mixed efflu­ents and waste­water using flow con­trols and dis­charge reg­u­la­tors, such as the HydroSlide and Elec­troSlide from the Stein­hardt prod­uct range. These units keep dis­charges from atten­u­a­tion struc­tures and sew­ers con­stant over the whole impound­ing head (Q = con­st). Lim­it­ing flows is a sep­a­rate task; for exam­ple, a flow must be set accord­ing to one spe­cif­ic impound­ing head val­ue. The unit select­ed will reg­u­late the flow to ensure that the flow rate is not exceeded.

The Solution

The HydroLim­iter is extreme­ly well-suit­ed to con­trol dis­charges or to lim­it max­i­mum water lev­els. It is a cost effec­tive alter­na­tive when accu­ra­cy of the dis­charge is of sec­ondary impor­tance. The HydroLim­iter is sup­plied in three vari­ants; M, N and S, depen­dent upon the depth of water to be con­trolled. These units dif­fer from the HydroSlide range in that the unit’s float is direct­ly con­nect­ed to the ori­fice shut­ter and the depth of water direct­ly alters the aper­ture. The HydroSlide has a ‘con­trol cam’ which mod­i­fies the ori­fice open­ing to main­tain a con­stant dis­charge. As the HydroLim­iter has no mod­i­fy­ing  ‘con­trol cam’, the dis­charge curve of the unit is an elon­gat­ed ‘S‘, sim­i­lar to that of a vor­tex reg­u­la­tor. The HydroLim­iter is avail­able in sizes 150 mm to 1000 mm. Each unit has a choice of one of six set­tings to suit required flow needs, the flow curves includ­ed with­in this doc­u­ment can be used for selec­tion pur­pos­es. The dis­charge char­ac­ter­is­tics required should be clar­i­fied with Stein­hardt GmbH.

HydroLim­iter OW model
(upstream/inlet instal­la­tion)
The dis­charge char­ac­ter­is­tics of the HydroLim­iter in upstream con­fig­u­ra­tion can be adjust­ed on site by alter­ing the lever posi­tion in accor­dance with the dis­charge flow dia­gram. Dis­charge char­ac­ter­is­tics are influ­enced by the back­wa­ter and the max­i­mum dis­charges decrease.

HydroLim­iter UW model
(downstream/outlet installation)
The HydroLim­iter serves to lim­it the max­i­mum flow rate pass­ing down­stream. This will cause the upstream sys­tem to sur­charge into an atten­u­a­tion sys­tem. The HydroLim­iter UW mod­el is rein­forced in order to cope with high hydraulic pres­sure. The dis­charge char­ac­ter­is­tics should be clar­i­fied with Stein­hardt GmbH.

The Advantages

• con­trols discharges
• lim­its max­i­mum water levels
  for form­ing cascades
• low-cost alter­na­tive when dis­charge accu­ra­cy is subordinate
• com­plete stain­less-steel con­struc­tion, mate­r­i­al 1.4301 (V2A), 1.4571 (V4A) on request
• robust con­struc­tion
• easy mount­ing, no wall clearance
• com­plete with stain­less-steel fas­ten­ings and seal­ing material