Backflow Prevention (Check Valves)

Swing check valves, which are used to prevent the backflow of fluid, are designed to operate under both positive and negative pressure conditions, and are suitable for use with both clean and contaminated water.

LoRaM-BusM-BusWIRELESSRS-485

Why Choose ATLAS Check Valves?

ATLAS check valves are mechanical valves that open with forward flow and close when flow stops to limit reverse flow. Swing and tilting-disc options allow selection for pipeline layout and operating conditions, supporting protection of pumps and line equipment against backflow.

Top-cover access to the swing-valve disc mechanism simplifies maintenance on a safely isolated line. A compact tilting-disc design and adjustable counterweight arrangement allow installation space and closing behaviour to be considered together. Horizontal or vertical suitability is checked for the selected model and flow direction.

PN10/PN16 options and metal or resilient sealing arrangements support application-specific selection. Listed materials such as ductile iron, bronze seat rings and stainless steel shafts are matched to the quoted variant. Selection considers flow velocity and closing requirements as well as pipe size.

Key benefits

Flow-operated mechanical backflow control.
Swing or compact tilting-disc designs.
Model-specific sealing, counterweight and installation options.

Spring-Loaded Check Valve

It begins to operate when flow starts in the pipeline, opening the disc as it moves in the direction of flow. The disc is designed to allow full passage. Should flow cease in the pipeline, it closes to prevent reverse flow. Sealing is achieved by the disc seating against the metal seat surface. Sealing can be achieved either by metal-to-metal contact or using a sealing gasket, depending on the application. If required, the valve disc can be coated with rubber to ensure sealing. It can also be manufactured with a counterweight to provide flow control. It is suitable for use in vertical pipelines. Maintenance and repair are very straightforward. When the top cover bolts are removed, the valve and connection mechanism can be removed. It provides full sealing at low pressures. During installation, the valve must be fitted to the pipeline in accordance with the arrow marking on the valve.

Tilting Check Valve

Its short-body design offers significant advantages in terms of size and weight. The ability to attach the counterweight arm to either the right or left side of the check valve facilitates connection to the pipeline in both horizontal and vertical positions. The valve disc moves freely in response to the flow. The valve’s opening speed and extent depend on the flow rate. The position of the weight on the counterweight arm can be adjusted according to operating conditions. Sealing is achieved by metal-to-metal contact or a sealing gasket. In areas in contact with water, the connecting bolts are made of A2 70 stainless steel. The tilting check valve features a maintenance-free design.

BODY GJS500
BODY SEAT RING BRONZE
DISK SEAT RING BRONZE
DISC GJS500
WASHER A3

LOCKING NUT A3
ARM GJS500
HING PIN AISI 420
PLUG A3
GASKET NYL

GASKET NBR
BOLT A3
NUT A3
BONNET GJS500
PAINTING Thermoplastic or Epoxy 400 µm

DN[mm]	Length [mm]	Height [mm]
50	200	137
65	240	147
80	260	159
100	300	180
125	350	203
150	400	223
200	500	258
250	600	290
300	700	325

General
General	Maximum operating pressure based on design pressure	PN10/16
	Operating temperature	-10°C to 90°C
Standards
Standards	Certificate	WRASS certification for drinking water
	Certificate	Hydrostatic tests in accordance with EN 12266-1
	Machinery Directive	EC Directive
	Standard	Distance between flanges in accordance with DIN 3202 F6
	ISO	Side flanges in accordance with ISO 7005-2