Ball check valves
Innovative SZUSTER system elbow ball check valves are the first, which have a fully open position and a constant K factor starting from the flow rate of 2.3 fps
Patented SZUSTER system ball check valves (US 8,146,618 B2, US 8,082,949 B2), due to the unique characteristics and usable features, are widely used in ordinary lift 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: 1 1/4″ – 12″.
- Pressure rated to 230 PSI (all valves are tested to 150 PSI leak test / 230 PSI hydrostatic shell test).
- Medium temperature: max 104ºF (temporarily to 140ºF).
- Painted with a 200 µm thick coat of epoxy paint, RAL 5015.
- Flanges complying with ANSI/ASME B16.1 Class 125.
- Patents no.: US 8,146,618 B2, US 8,082,949 B2.
- API 598 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. 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 104ºF 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 Lift Stations
- Space saving – our valves enable space saving in a liftstation 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 2.3 fps – the SZUSTER system check valves are fully opened at the velocity of 2.3 fps, thereby enabling the effi cient 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 2.3 fps – fully open position and constant factor K, starting from the flow rate of 2.3 fps.
- 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 rotor) and inspection of the pressure pipeline - Reduction of vibrations making a 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 factor K starting from the flow rate of 2.3 fps.
- Reduction of vibrations making a 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 |
| 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 49.9 lb/ft3 |
Backwater protection (valve is fully opened with the velocity of 0.66 fps) |
| Version with quasi ball (Q) | The valve in Q version is equipped with a quasi floating ball with a specific weight of approx 63.7 lb/ft3 |
Lift stations, lift 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
| Type | DN | NPS | Cast Iron | Ductile Iron | Floating ball (F) | Quasi ball (Q) | Drainage (D) |
| Type ESK 01 – threaded | |||||||
| ESK 01 | 32 | 1 1/4″ | regular | n/a | option | n/a | n/a |
| ESK 01 | 40 | 1 1/2″ | regular | n/a | option | n/a | n/a |
| ESK 01 | 50 | 2″ | regular | n/a | option | n/a | n/a |
| Type ESK 11 – flanged | |||||||
| ESK 11 | 50 | 2″ | regular | n/a | option | n/a | n/a |
| ESK 11 | 80 | 3″ | n/a | regular | option | option | n/a |
| ESK 11 | 100 | 4″ | n/a | regular | option | option | n/a |
| ESK 11 | 150 | 6″ | n/a | regular | option | option | option |
| ESK 11 | 200 | 8″ | n/a | regular | option | option | option |
| ESK 11 | 250 | 10″ | n/a | regular | option | n/a | option |
| ESK 11 | 300 | 12″ | n/a | regular | option | n/a | option |
| Typ COMBI 01 – threaded inlet, flanged outlet | |||||||
| COMBI 01 | 50 | 2″ | regular | n/a | option | n/a | n/a |
| Typ COMBI 11 – flanged | |||||||
| COMBI 11 | 50 | 2″ | regular | n/a | option | n/a | n/a |
| COMBI 11 | 80 | 3″ | n/a | regular | option | n/a | n/a |
| COMBI 11 | 100 | 4″ | n/a | regular | option | option | option |
| Typ COMBI 11 – flanged, oval version | |||||||
| COMBI 11 | 50.O | 2″ | n/a | regular | option | n/a | n/a |
SZUSTER system elbow check valves are made from cast iron (1 1/4″ – 2″) or ductile iron (3″ – 12″). Their optimal ranges of working pressure are adapted to the pressure occurring in the sewage systems (145 PSI or 230 PSI – different for each type).
Ball check valves dimensions
| Type | DN | Size | L | H | D | K | l x n | s | Gw | ζ* | Weight |
| [inch] | [lb] | ||||||||||
| ESK 01 | 32 | 1 1/4” | 3 1/8” | 3 1/8” | — | — | — | 2 3/16” | NPT 1 1/4” | 1.4 | 4 |
| ESK 01 | 40 | 1 1/2” | 3 3/4” | 3 3/4” | — | — | — | 2 3/8” | NPT 1 1/2” | 3.9 | 5.1 |
| ESK 01 | 50 | 2” | 3 3/4” | 3 3/4” | — | — | — | 3” | NPT 2” | 2.4 | 9.3 |
| ESK 11 | 50 | 2” | 3 3/4” | 3 3/4” | 6 1/2” | 4 3/4” | 3/4″ x 4 | — | — | 2.4 | 16.1 |
| ESK 11 | 80 | 3” | 6 1/2” | 6 1/2” | 7 1/2” | 6” | 3/4″ x 4 | — | — | 1.7 | 33.3 |
| ESK 11 | 100 | 4” | 8” | 8” | 9” | 7 1/2” | 3/4″ x 8 | — | — | 1.6 | 56.3 |
| ESK 11 | 150 | 6” | 11” | 11” | 11” | 9 1/2” | 7/8″ x 8 | — | — | 1.6 | 109.8 |
| ESK 11 | 200 | 8” | 14” | 14” | 13 1/2” | 11 3/4” | 7/8″ x 8 | — | — | 1.6 | 203.5 |
| ESK 11 | 250 | 10” | 17” | 17” | 16” | 14 1/4” | 1″ x 12 | — | — | 1.5 | 329.4 |
| ESK 11 | 300 | 12” | 20 1/2” | 20 1/2” | 19” | 17” | 1″ x 12 | — | — | 1.5 | 491.6 |
| Type | DN | Size | L | H | D | K | K 1 | l | 2 x T | l 2 | ζ* | Weight |
| [inch] | [lb] | |||||||||||
| COMBI 01 | 50 | 2” | 4 1/2” | 3 15/16” | NPT 2” | 4 3/4” | NPT 2” | 3/4” x 2 | 2 x 5/8-11 UNC | NPT 2” | 2.6 | 19 |
| COMBI 11 | 50 | 2” | 4 1/2” | 3 3/4” | 6 1/2” | 4 3/4” | 4 3/4” | 3/4” x 2 | 2 x 5/8-11 UNC | 3/4” x 4 | 2.6 | 29 |
| COMBI 11 | 50.O* | 2” | 4 1/2” | 3 3/4” | 5 7/8” | 4 3/4” | 4 1/2” | 3/4” x 2 | 2 x 5/8-11 UNC | 3/4” x 4 | 22.3 | |
| COMBI 11 | 80 | 3” | 7 1/16” | 6 1/2” | 7 1/2” | 6” | 6” | 3/4” x 2 | 2 x 5/8-11 UNC | 3/4” x 4 | 54 | |
| COMBI 11 | 100 | 4” | 8 1/4” | 8” | 9” | 7 1/2” | 7 1/2” | 3/4″ x 6 | 2 x 5/8-11 UNC | 3/4″ x 8 | 74.3 | |
Elbow ball check valves installation method
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.
