Ball check valves

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Innovative SZUSTER system elbow check valves are the first, which have a fully open position and a constant local resistance coefficient starting from the flow rate of 0.7 m/s.

SZUSTER system ball check valves, due to the unique characteristics and usable features, are widely used in ordinary pumping stations and pumping stations with separation of solids and pumps. Thanks to safety and ease of use (the possibility of placing the cover in service position), they are also valued by Users of sewer systems.

SZUSTER system’s solution is also a water check valve used in hydrophore sets and water wells.

Technical data

  • Range of available diameters: DN32 – DN300.
  • Pressure rated to PN 1.6 MPa (all valves are tested to PN 1.0 MPa leak test / PN 1.6 MPa hydrostatic shell test).
  • Medium temperature: max 40ºC (temporarily to 60ºC).
  • Painted with a 200 μm thick coat of epoxy paint, RAL 5015 (optional: 300 μm, other colours).
  • Flanges complying with EN 1092-2.
  • EN 12050-4 tests and requirements.

SZUSTER System Elbow Ball Check Valves type ESK 01 or COMBI 01 (with threaded connection), and ESK 11 or COMBI 11 (with flange connection) are used for self-actuating protection against reversible wastewater flow from the backflow of the medium the moment the pump/compressor stops working (except ESK 11.L – when the pump/compressor starts working). An additional function of type COMBI is the possibility of manual cutting off at any time the flow of fluid by closing the knife gate valve, which is an integral part of the construction. Elbow check valves are used in wastewater systems with or without the fecal matter up to the the temperature of 40ºC and a pH range of 4-8.

In comparison with traditional ball check valves and flap check valves our product provides many benefits.

For Pumps

  • Enables more compact construction of the pump canopy.
  • Low service time – our ball check valves take less than 15 minutes to service.
  • Quick replacement time – customers can quickly replace the valve balls themselves without damaging the equipment.

For Pumping Stations

  • Space saving – our valves enable space saving in a pumping station therefore giving the possibility of using a much smaller tank.
  • Quick replacement time – customers can quickly replace valve balls themselves without damaging the equipment.
  • Full opening at the velocity of 0.7 m/s – the SZUSTER system check valves are fully opened at the velocity of 0.7 m/s, thereby enabling the efficient work of the customer’s system.
  • Significant reduction of vibration – our check valves successfully reduce vibrations thereby making the system work more quietly.

For Waterworks

  • Full opening at the velocity of 0.7 m/s – fully open position and constant local resistance coefficient, starting from the flow rate of 0.7 m/s.
  • Easy access to valves interior and the ball which enables:
    – placing the cover in the so-called servicing position
    – inspection of the inlet pipeline (including the pump impeller) and inspection of the pressure pipeline
  • Reduction of vibrations making the system work more quietly.

For Engineers

  • Combined solution – a two-in-one compact solution (elbow, check valve) or even a three-in-one compact solution (elbow, check valve, knife gate valve).
  • Fully open position and constant local resistance coefficient, starting from the flow rate of 0.7 m/s.
  • Reduction of vibrations making the system work more quietly.

Product development is our priority. We listen carefully to the opinion of our customers, thus constantly creating new versions and improvements such as quasi balls – used by manufacturers of lift stations with the separation of solids.

Additional options of ball check valves

Type of check valve Characteristics Examples of application
Long version (L) The valve in L verison has a free passage for the ball
with a nominal diameter of the valve
Pumping station with separation of solid parts,
pneumatic pumping stations.
Version with floating ball (F) The valve in F verison is equipped with a ball, so-called “floating” ball,
with a specific weight of approx 0.8 g/cm3
Backwater protection.
Version with quasi ball (Q) The valve in Q version is equipped with a quasi floating ball with a specific weight of approx 1.02 g/cm3 Pumping stations, pumping stations with separation of solids, pumps with inverter
Version with drainage (D) The valve in D version is equipped with drain plug
for valve drainage
Pumps, dry lift stations, gravity installations
with anti reflux valves

Table of options

DN PN 10 PN 16 Cast Iron Ductile Iron Long version (L) Floating ball (F) Quasi ball (Q) Drainage (D)
Type ESK 01 – threaded
32 regular option regular n/a n/a n/a n/a n/a
40 regular option regular n/a n/a n/a n/a n/a
50 regular option regular n/a n/a option n/a n/a
Type ESK 11 – flanged
50 regular option regular n/a n/a option n/a n/a
65 regular option regular n/a n/a option n/a n/a
80 regular option regular n/a option option option option
100 regular option regular n/a option option option option
150 regular option n/a regular n/a option option option
200 regular option n/a regular option option option option
250 regular option n/a regular n/a option n/a option
300 regular option n/a regular n/a option n/a option
Typ COMBI 01 – threaded inlet, flanged outlet
50 regular n/a option n/a n/a option n/a n/a
Typ COMBI 11 – flanged
50 regular n/a option n/a n/a option n/a n/a
80 regular n/a option n/a n/a option option option
100 regular n/a option n/a n/a option option option
Typ COMBI 11 – flanged, oval version
50.O regular n/a option n/a n/a option n/a n/a

SZUSTER system elbow check valves are made from cast iron (DN32 – DN150) or ductile iron (DN200 – DN300). Their optimal ranges of working pressure are adapted to the pressure occurring in the sewage systems (PN 1.0 MPa or PN 1.6 MPa – different for each type).

Ball check valves dimensions

ESK ball check valves
wymiary-zaworow-zwrotnych-esk_web2
DN L H D d K l x n S Gw ζ* Masa
(mm) (“) (kg)
Type ESK 01 – threaded
32 80 80 55 1 1/4 1,4 1,8
40 100 100 60 1 1/2 3,9 2,3
50 100 100 75 2 2,4 4,2
Type ESK 11 – flanged
50 100 100 165 99 125 ø 19 x 4 2,4 8,3
65 140 140 185 118 145 ø 19 x 4 1,5 10,9
80 165 165 200 133 160 ø 19 x 8 1,7 16,7
100 200 200 220 156 180 ø 19 x 8 1,6 25,4
150 280 280 285 211 240 ø 23 x 8 1,6 49,6
200 350 350 340 266 295 ø 23 x 8 (12) 1,6 83,7
250 425 425 400 319 350 ø 23 x 12 1,5 131
300 510 510 455 375 400 ø 23 x 12 1,5 197
Type ESK 11 – flanged, long version – L
80 200 200 200 133 160 ø 19 x 8 0,9 17,7
100 250 250 220 156 180 ø 19 x 8 1,1 29,6
200 400 400 340 266 295 ø 23 x 8 1,6 78,1
COMBI ball check valves
wymiary-zaworow-zwrotnych-combi_web2
DN L H D d K l x n S Gw ζ* Masa
(mm) (“) (kg)
Type COMBI 01 – theaded inlet, flanged outlet
50 110 100 165 102 125 ø 19 x 4 75 2 2,6 8,6
Type COMBI 11 – flanged
50 110 100 165 102 125 ø 19 x 4 75 2,6 12,8
65 155 140 180 122 145 ø 19 x 4 1,5 16,8
80 165 165 200 138 160 ø 19 x 8 1,8 24
100 200 200 220 160 180 ø 19 x 8 1,7 32,7
Type COMBI 11 – flanged, oval version – O
50.O 115 100 148 114 ø 18 x 2 2,4 10,6

Elbow ball check valves installation method

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Our valve substitutes an elbow on the pipeline and eliminates one flange joint (COMBI check valve eliminates 2 flange connections). It is located at a right angle and connects a vertical pipe with the horizontal one. Please note that the technology of ESK check valves allows using them on surface and underground installations.

SZUSTER system elbow check valves, type ESK or COMBI can be mounted in horizontal and vertical drainage systems in the positions as shown.

The working principle and ball check valves testing