Inter-flange non-return valves
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Fig.C207Rotary check valve with counterweight, interflange steel, disc-steel, PN10 -
Fig.C201Non-return valve double-leaf between flange cast iron, leaves-cast iron GGG40, EPDM, PN16
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Fig.C202Non-return valve two-leaf between flanges cast iron, leaves - stainless steel 304, VITON, PN16
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Fig.C212Non-return valve inter-flange steel, disc-nzh steel 304, NBR, PN16
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Fig.C221Two-leaf inter-flange non-corrosive check valve, leaves - stainless steel 316, VITON, PN25
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Fig.C222Inter-flange check valve, stainless steel, 316 disc, VITON, PN16
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Fig.C223Check valve spring-loaded inter-flange stainless steel plate 316, PN25
UKSPAR range of flanged check valves
UKSPAR offers reliable solutions for modern pipeline systems. The range includes:
- single-leaf models with a disc made of steel or stainless steel 304/316;
- double-leaf valves with a cast iron body GGG40 and cast iron or stainless steel blades;
- rotary valves with counterweight for large diameters.
Seals are made of EPDM, NBR or VITON depending on the medium and temperature. The working pressure of the models is from PN10 to PN25.
How to choose a flanged valve by diameter and pressure
The selection of valves begins with an analysis of the network parameters. The main criteria are the nominal flow and operating pressure.
- The diameter must exactly match the pipe cross-section to avoid flow restriction and pressure loss.
- The pressure in the system cannot exceed the product's nominal values.
- For standard networks, a pressure of 10 or 16 bar is usually sufficient.
- For industrial mains and powerful pumping stations – 25 bar and above.
It is important to consider the temperature of the medium, as the maximum allowable pressure decreases when heated.
Design and operating principle
The basis of the product is a compact housing that is clamped between two flanges of the pipeline. Inside is a moving element and a spring. When the pump creates pressure, the flow deflects the shut-off element and flows freely. As soon as the pump is turned off or the inlet pressure drops, the mechanism reacts instantly.
Due to the direct-action principle, the mechanism does not require external power sources, electric current or compressed air connection. The control of the closing element is carried out by the energy of the flow of liquid or gas moving through the pipes.
Rotary disc and closing mechanism
In rotary models, the disc is fixed on an axis and rotates under the pressure of the flow, and the reverse movement of the medium presses the disc against the seat and blocks the passage.
In double-leaf valves, the role of the closing element is performed by two semicircular leaves on a common axis, which close under the action of reverse flow.
Spring-loaded models accelerate closing by using a spring to press the disc against the seat before the reverse flow can gain strength. This is important in vertical pipelines and in the event of water hammer.
Manufacturing materials
The material from which the flanged check valve is made determines its durability, corrosion resistance and chemical neutrality. UKSPAR uses high-quality materials to ensure trouble-free operation of the equipment.
Cast iron body (GGG40) is used in municipal and industrial water supply networks, where mechanical strength is important at a moderate cost.
The steel body can withstand higher pressure and loads, which is why it is chosen for industrial pipelines.
Stainless steel is a solution for aggressive environments, elevated temperatures, and objects with high requirements for corrosion resistance.
Advantages of the interflange type over the flange type
The interflange valve is more compact and lighter than its flanged counterpart, as it does not have its own flanges. This reduces the weight of the assembly, simplifies installation, and reduces the length of the pipeline section.
Fastening is done with the same bolts or studs that tighten the pipeline flanges, without additional connecting elements. This also makes the cost lower compared to the flange model.
Areas of application and installation
UKSPAR flanged check valves are widely used in various industries and utilities:
- Water supply systems.
- Heating systems.
- Sewerage networks.
- Industrial pipelines.
- Fire extinguishing systems.
The flange-type check valve is mounted between two flanges of the pipeline, taking into account the flow direction indicated by the arrow on the body. Sealing gaskets are installed on both sides of the valve before tightening the bolts.
If you are planning to buy an interflange check valve, the UKSPAR catalog presents solutions for various operating conditions. The company's specialists will help you choose the optimal model according to the parameters of your system.