VALVES

Injected or custom made non-return valves

Which type of valve should we choose ?

Overview

A backflow valve should be installed whenever there is a possibility of backflow. The backflow is due to a loading of the communal collector which can be caused by heavy storms. This phenomenon is often observed along unit collectors or near stormwater runoffs on separating collectors. Most often, the unfavourable situation is not known at the time of construction and the valve becomes a backup solution to prevent further flooding. The choice of the model of the valve is often dictated by the characteristics of the pipe and by the existing inspection chambers.

Operation of a valve

Ideally, the valve should be opened in order to allow normal flow and closed when there is backflow. In practice, operation is much simpler when discharging rainwater or solids-free wastewater from floor grills or sinks. The flow of water pushes a clapper that remains closed when there is no flow. For wastewater containing solids, systems that promote the passage of solids carried by water should be used.

Applications
Clapper valves
Valve without float
Float valves
Wastop® valves
Waback® valves
Clean water, rainwater
yes
yes
yes
yes
yes
Solids-free wastewater
yes
yes
yes
yes
yes
Wastewater, containing solids
no
no
yes
possible
yes
Fixing in existing manhole
Unlikely
possible
possible
yes
yes
Fixing in new manhole
possible
possible
possible
yes
yes
Creation of a new manhole
possible
possible
possible
Not necessary
possible
Anti-odour on overflow
no
yes
no
yes
no
Low level variation
yes
yes
no
yes
yes
High level variation
no
yes
necessary
yes
possible
Collector Ø in mm
110 to 315
110 to 400*
110 to 400*
75 to 1400
110 to 315
Material used
PVC
PVC
PVC
PE
PE
Price category in CHF
From 290.--
From 585.--
From 665.--
From 830.--
From 1'710.--
arqc01 arqc02 arqc03 arqc06 arqc04
* Other dimensions on request

Canplast non-return valves

Custom made in PVC
Canplast logo sur mesure

Clapper non-return valves
Injected PVC with cleaning hatch

Area of use

This type of valve is inserted in the pipe system as a normal PVC short pipe. It can be put in place as a preventive measure during construction, or later, after having observed the presence of a backflow. If it is buried, it is necessary to put it at the bottom of a manhole in order to have access to it, control its operation and clean it. It is also useful to prevent some animals, such as rodents, from getting back into the pipe.

Showroom 06

PVC non-return valves without float

Area of use

This type of valve can be installed in an existing or new inspection chamber. It is suitable for rainwater or wastewater that is free of solids. It can also be used as an anti-odour valve on overflow pipes. The difference in level between the lower level of the upstream pipe and the base of the inspection chamber must be at least 20 to 40 mm depending on the model. The valve must remain accessible for inspection or maintenance.

PVC non-return float valves

Area of use

The non-return valve prevents backflow of wastewater into basements when the communal collector or the collector of the residential area is loaded.

The Canplast PVC valve is designed for installation on plastic pipes, but it can also be adapted to other types of pipes. This type of valve can be installed in an existing or new inspection chamber. It is recommended for wastewater that contain solids. The difference in level between the lower level of the upstream pipe and the base of the inspection chamber must be sufficient to allow the floats to move. The valve must remain accessible for inspection or maintenance.

Operation

When the pipe runs normally, the weight of the floats keeps the damper open. When the water level rises in the collector, the floats rise and close the damper.

For proper operation, it is necessary that the movement of the floats not be hindered by a possible build-up of solid matters. The non-return valve should be cleaned regularly.

 

Waback® non-return valves

Waback 20

When to use a Waback® valve

WaBack® is a manhole that is installed outside buildings, on the wastewater outlet, where it plays the role of a backflow valve.

The installation of a Waback® on the wastewater outlet of the building offers a safe protection against the flooding of basements in the zones at risk.

WaBack® works both as a non-return valve and as a manhole. Installed during construction, this "all-in-one" module reduces installation costs.

Its small size allows it, in some cases, to be installed in existing concrete manholes of 80 cm diameter and over.

Wastewater is often very loaded with solids. In this context, Waback® is a safe choice. Its pipe is fully open at normal flow, which minimizes the risk of technical incidents and the need for maintenance operations.

The standard model of Waback® is prefabricated in polyethylene. It is quickly available from our stock.

WaBack® is also obtainable in "mini" version for cellar installation.

WaBack sabot
WaBack dimensions
Reference
Pipe Ø
Ø1
(mm)
H
(mm)
L
(mm)
wb110-mini
110
400
306 mm
wb110-600
110
720
580 mm
wb160-600
160
720
580 mm
wb200-600
200
720
575 mm
730
wb315-800
315
720
1200 mm

Tested and certified

WaBack® has been extensively tested and has been adopted in many countries. Since 1988, WaBack® has avoided thousands of potential floods !

Waback® backflow valves require minimal maintenance. WaBack® is CE certified for backflow protection in wastewater or rainwater systems.

Tips :

Keep in mind that every time the main collector fills up, the valve closes, and that when the valve is closed, it is not possible to evacuate water from the building. Therefore, it is advisable, when possible, to connect all wastewater pipes that comes from the higher levels or rainwater pipes that come from the roof downstream of the valve.

This measure prevents the wastewater from the floors coming out of the basement grills or the rainwater filling the drainages or overflowing by the grills located in the basement.

Wapro coupe

The WaBack® non-return valve and WaBack® Access has been thoroughly tested by both laboratories and councils in Sweden, Norway and Denmark. All tests show that all WaBack® models are effective in stopping flooding caused by backflow and that it requires minimal maintenance. WaBack® and WaBack® Access are certified for use in storm water and sewage systems. The entire WaBack® range is CE approved according to regulations for building products. WaBack® check valves are for use as a non-return valve of Type 1 for back flow in sewage and drainage systems. SS-EN-13564-1:2002.

Security alarm

If the water from the upper floors cannot be separated from the basement water, it is recommended to install a level alarm that will warn you of the closure of the valve and of the risk of a small flood due to the waters coming from your own building.

Wastop® backflow valves

An ingenious backflow valve

The Wastop® valve consists of a stainless steel or plastic cylinder with a conical polyurethane membrane attached inside.

The Wastop® valve:

  • is the only valve that can be installed easily and at no additional cost in an existing inspection chamber or along an accessible pipe,
  • is the only one that can be installed on both low gradients and vertical columns,
  • can be installed in all pipes of circular section whatever the material,
  • can be installed in all pipes from Ø 75 mm to Ø 1'785 mm,
  • prevents backflow. It also has the advantage of preventing odours from rising in the building.
WaStop front

How Wastop® works

Wastop Out Wastop In
Flow in the right direction causes the membrane to rise and allows water to flow (Fig.1). If the flow is reversed (backflow), the conical membrane fills up and projects against the wall of the pipe, preventing any flow in the wrong direction (fig.2).

Installation inside an inspection chamber

The Wastop® valve can be installed in a few minutes inside an existing manhole. It can be placed upstream or downstream of a manhole located outside the building (fig.3). The seals and the brackets are delivered with the valve.

Installation in a pipe

Wastop FR 02

The Wastop® valve is inserted in a pipe and connected using two sleeves (fig.4)

Wastop FR 03

or pushed in place at the end of a pipe (fig.5).

Stainless steel version 304/316

Reference
DN
Weight
(kg)
A
(mm)
L
(mm)
Int. Ø of existing pipe
(min.-max.)
ws97std
100
0.700
97
210
99-101
ws101std
110
0.800
100
215
101-104
ws116std
125
0.900
115
230
117-120
ws118std
125
1.000
118
250
118-125
ws146std
150
2.400
144.5
300
146-159
ws183std
200
4.200
181
385
182-200
ws193std
200
4.600
191
395
193-210
ws215std
225
5.500
215
450
216-233
ws230std
250
6.200
230
480
232-248
ws240std
250
6.700
240
520
242-258
ws283std
300
10.000
283
600
286-300
ws290std
300
10.000
290
600
293-307
ws340std
350
18.000
340
700
343-349
ws370std
400
20.000
370
730
373-391
ws390std
400
24.000
390
750
393-411
ws440std
450
28.000
443
840
446-464
ws490std
500
29.000
490
900
493-503
ws590std
600
48.000
587
1200
590-598
ws690std
700
63.000
690
1300
695-705
ws750std
750
75.000
750
1400
755-765
ws790std
800
88.000
790
1500
795-805
ws885std
900
116.000
885
1700
890-910
ws985std
1000
141.000
985
1800
990-1010
ws1185std
1200
290.000
1185
2250
1190- 1210

Plastic version

Reference
DN
(mm)
Weight
(kg)
A
(mm)
L
(mm)
ws75pvc
75
0.300
75
125
ws110pvc
110
0.900
110
210
ws125pvc
125
1.200
125
240
ws160pvc
160
2.100
160
310
ws200pvc
200
4.100
200
400
ws250pe
250
6.300
250
480
ws250pe-I
250
4.600
236
480
ws315pe
315
12.500
315
600
ws315pe-I
315
8.300
295
600
Dimensions 37

For other diameters, please contact Canplast.

Non-contractual data

Used on a rainwater system, the cleaning requirements of the Wastop® valve are practically non-existent.
For use on pipes for wastewater containing solids, in an existing chamber, with a gradient of less than 3%, checks and possible cleaning will be needed.
For the evacuation of wastewater in a chamber that has yet to be built, it is advisable to install a Waback® type valve or a culvert valve.

Ø 75 to 200 mm models were tested for a return pressure of 5 meters of water column. The other dimensions are tested for a pressure of 3 meters of water column.

A rigorous testing procedure is undertaken at Wapro® to ensure our valves meet our exacting standards. Our valves tested to appropriate standards in our target markets at third party organizations such as Utah State University Hydraulics Lab, Danish Technological Institute.  Kiwa Sverige AB on an annual basis.

CE-approved models type 0 (NPS 3-8") are tested according to SS-EN 13564-2:2002.
WaStop® also meets the requirements according SS-EN 13564-1:2002 and quality assurance according SS-EN 13564-3:2004. Other dimensions are tested according to the same standard and meets the same requirements and quality assurance.

WaStop is patented in the EU, USA and other countries.

Wastop Residential

Wastop Inline

Scope of application

Wastop® has a wide scope of application: from protection against flood of basements (fig.6) to rising levels of lakes (fig.7).

Wastop étang

Figure 6.

Wastop Stop-rat

Stop-rats

Gallery of images

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