Check valve (flange, wafer). Flanged check valve Water supply flanged check valve

As a rule, check valves can be divided into two categories, depending on the specific connection to the pipeline - flanged or wafer connection.

What is a flanged check valve

Eg, flanged check valve actively used in the water supply system, thereby preventing possible water hammer or the appearance of reverse water flow. Such a device does not belong to the group of shut-off valves. According to own design features, this model can be of several types: spring, ball or lifting.

The presented device is used to pass various liquids exclusively in one specific direction, and a special flange connection is used as fastening.
In general, a flange is a corresponding connecting part of a pipeline system, which is a disk or a small frame with special holes for bolts.
Such a valve is mounted on horizontal pipes in order to automatically shut off the flow of water or other working fluids that are transported through the pipeline. These devices can be considered a regulatory mechanism.

What is a Wafer Check Valve

As for the second type of connection, wafer models are usually used for installation on appropriate technical pipelines for high-quality protection and quickly shutting off the water flow in automatic mode. Wafer check valves are used for all kinds of liquids, including gas or steam. Thanks to certain design features, such devices are characterized by maximum tightness and completely eliminate the possibility of even the slightest water hammer.

Unlike flanged models, Wafer valves can be installed in absolutely any convenient position - horizontally or vertically. During installation, such a valve will be securely fixed between two flanges (hence the name). It is important to note the fact that the flow of incoming liquid must go in the direction of the valve disk itself, where a special arrow will point.

In heat and water supply systems, it is customary to use thermal locking wafer devices, which guarantee high quality protection for any pipeline.

Where can I buy both types of pipeline fittings?

You can order and purchase on our official website right now.

Back flanged valve- a type of protective pipeline fittings. It differs from other modifications in the type of connection (flange). Refers to types of fittings direct action With automatic control– passes the flow working environment in one direction. When the direction is changed to the opposite, the valve automatically closes the flow area. For this purpose, the force from the gravity of the shutter, from the spring, from the lever-load mechanism is used.

Using flanged valves

The placement of check valves prevents the occurrence of emergency situations in pipeline systems in case of emergency pressure drop. Flanged check valves are installed on pressure sections of pipelines (according to the number of pumps connected in parallel), on pipelines after the meter (flow meter), in complex systems heating, water supply, other working environment in areas that require movement in only one direction (fill valves closed systems; valves in front of the cleaning filters).

Advantages

The flanged design slightly increases the value connecting size. This feature is compensated by the ease of installation, maintainability of the valve, unpretentiousness in operation (no need for Maintenance). In addition, flanged check valves are reliable in operation and provide complete shutoff of the reverse flow of the working medium. It is possible to select a full bore valve design with a minimum of hydrodynamic losses.

Design Features

Flanged valves have a cast metal (usually cast iron) body. There are connecting flanges on both sides. Internal structure determined by the type of shutter mechanism used. The most common types of mechanisms are: lifting, ball, disk, rotary.

Installation of flanged valves

All types of flanged check valves are installed in the pipeline taking into account the direction of forward flow. In valves with a lifting plug mechanism, normal closed position the shutter is supported by a spring. When flow moves under the valve, the valve opens. Such a valve is mounted on vertical, inclined, and horizontal sections.

Ball valves use a locking element in the form of a metal ball. In the absence of flow or in the opposite direction, the ball, under its weight, blocks the passage hole. Installation of such a flanged valve is carried out with the ball chamber oriented upwards.

The PASADOR company offers to buy check valves of various modifications at attractive prices. We supply products to all regions of Russia.

Pipeline fittings of this type are used to prevent the reverse movement of the working medium (water hammer or back pressure). Our range includes threaded, flanged and wafer products designed for industrial and household use and designed for long service life.

The advantages of check valves are:

• automatic operation without additional energy consumption;
• reliability;
• performing functions both in normal and emergency operating conditions;
• no significant impact on the pipeline capacity.
• opening the valve at a minimum pressure of 0.5 bar (gravity).
  

You can buy check valves for domestic and process water supply systems, heating systems, steam systems, oil and chemical industry, sewerage at reasonable prices. The products can be used in pipelines for transporting non-aggressive liquids and gases.

The catalog presents check valves with threaded, flange and wafer mounting in a body made of cast iron, carbon and of stainless steel, brass, bronze. Most models are designed for horizontal and vertical installation.

The design consists of a body and a shutter, the mechanism of which is a spool. In the absence of flow, fittings of this type are in a closed state. Under the influence of a moving working environment, the shutter automatically opens and closes when it stops. The spool opens only in one direction, so there is no reverse flow of media.

Types of check valves

We offer ball and straight line check valves with various types fastenings

Regular walk-through models are intended only for horizontal installation. Ball check valves can be installed in horizontal and vertical positions, since they use a ball element as a valve. These types of fittings are available with threaded and flange mounting.

Wafer check valves are installed in flanged pipe breaks. They can be mounted in vertical and horizontal positions. A flat disk is used as a shutter. Designs with double-leaf valves are equipped with damping elements to successfully resist water hammer.

Ball check valve type 012F (flanged, cast iron body)

Ball check valve is another type of check valve from Dendor Valve Industrial.

The ball check valve for protecting the pipeline from the reverse flow of the working medium is also called a “sewage check valve”. A steel ball covered with a protective layer acts as a backflow limiter. It is used in a wide variety of industries, but most wide application it got into the sewer installations.

The sewer check valve is installed in both horizontal and vertical positions. In a vertical position, the flow should be directed exclusively from bottom to top. The check ball valve is attached to the pipeline using flanges. For proper operation valve, the direction of movement of the medium must coincide with the direction indicated on the valve.

Ball check valve

Check valve ball– a type of pipeline fittings that ensures a one-way flow of working media in various engineering systems. Thanks to its special design, such a valve allows the medium to pass in one direction and prevents its reverse movement. This operating principle makes it possible to protect systems operating under pressure. The installation of ball valves is most in demand in hot and cold water supply, water disposal, and water treatment systems. They are also indispensable when arranging storm drains and sewer systems.

Features of design and use

The body of this product is made of cast iron, treated with epoxy powder coating. Other design advantages of a ball check valve include the following:

• the locking element is made in the form of a steel ball, on the surface of which an elastomeric coating is applied;
• for ease of installation of the valve, an arrow is marked on its body in accordance with the direction of movement of the working fluid flow;
• the product is equipped with a cover that allows it to be inspected and repaired without removing it from the pipeline.

Ball check flange valve can be installed in horizontal and vertical positions, being included in the system using flange connections.

Buy a ball check valve High Quality You can contact us by placing an order on the website or by contacting us by phone.

Large pipelines intended for operation in difficult operating conditions must be protected from pressure drops and prevent the formation of reverse flows in them, etc.

If this is not done, the system may fail, which is not so easy to solve. The simplest and most effective tool for such tasks is rightfully considered to be a wafer or ball tool.

They all have differences in design, but have one goal - to protect the pipeline from negative influence reverse flows and everything connected with them.

Contents of the article

Features and purpose

As we noted above, the reverse, as well as their varieties, essentially perform similar, almost identical tasks.

They protect water supply or heating equipment from:

• reverse flows;
• water hammer.

Let's figure out what this reverse flow is. Reverse flow in pipes is an interesting phenomenon characterized by a change in the direction of flow in pipes.

Imagine, for example, a heating system in a private house. In heating, the heated medium must move through the pipes constantly, so that the water does not stagnate; small circulation pumps are installed.

The pump, by its operation, provokes movement by increasing pressure in the pipes. If you turn it off, a kind of vortex may form inside the pipeline for a short period. Confusion with pressures will cause water to flow in the opposite direction.

For heating systems such things are not particularly scary. But we are not limited to them. For sewerage, large water supply pipes, industrial systems transportation, etc. backflow is very undesirable. Therefore, such things are strictly regulated there, and all dangerous places are protected.

The second dangerous factor is water hammer. They are called water hammer sudden changes pressure in the pipes, when a kind of shock wave is formed, passing along its entire length. When it encounters resistance, it has a destructive effect on problem areas. One water hammer is not a problem. Even a dozen will not have a serious negative effect.

The danger here is that water hammer is a periodic phenomenon, over time they will provoke destruction or severe wear of sections of the pipeline, which is desirable to avoid.

Similar problems reverse steel valve and prevents. It becomes a kind of bulkhead, airlock doors dividing the system into isolated sectors. Problems that appear in one sector remain in that sector.

Operating principle

The steel check valve operates thanks to its unique and very convenient design. This design is simple, but at the same time extremely effective.

Let's consider a standard steel sample, without going into the details of its individual varieties for now.

The basic steel receiving fitting consists of a body and a locking element. The body is made of steel or cast iron, with a certain diameter and properties.

There is a locking mechanism inside the housing. The mechanism, no matter whether it is ball, double-leaf or lifting, works due to the pressure of a special spring. The spring stiffness can be adjusted.

The spring works in one direction, that is, it allows the locking element to open when correct movement flow in pipes.

If the water begins to move, it begins to put pressure on the shutter or shut-off element of the check valve. The spring will withstand the pressure until it exceeds permissible norm, then the valve will begin to open.

A decrease in pressure signals that the water flow is weakening. The lower the pressure, the more the spring works. As soon as it falls below a certain point, the spring will close.

All the water that managed to pass through the bulkhead will remain in its place and flow further. The flow cannot be reversed, since the shut-off element in the valves opens only in one direction - in the direction of the given flow movement.

Types and properties

Let us draw your attention to the fact that the design of such equipment may differ depending on what tasks it faces and what specific type we are considering. - is not the same as a wafer butterfly valve, and both are different from what a grid foot valve is.

So, by type of construction The steel sample is divided into:

1. Turning.
2. Lifting.
3. Double-leaf.
4. Reception, with mesh.

In order to avoid such inconveniences, manufacturers came up with a rotating steel sample with a soft closing mechanism. It's a pleasure to work with him. The only negative is the cost.

The lifting sample uses a spool as a shut-off element. Lift valves are installed exclusively vertically. The spool, under the pressure of the flow, rises along its vertical axis and falls to its original place.

involves the use of a ball valve. It is characterized by large dimensions, therefore it cannot be used as a wafer unit. Otherwise, this is a standard locking part.

A bileaflet valve is usually made up of two operating leaflets. They are both connected to an internal spring that regulates the resistance force of the sashes. The doors are miniature and take up almost no space, so products with them are very compact.

A foot valve with a filtration mesh is a type of fittings designed exclusively for pumps that extract something from the bowels of the earth. The mesh prevents large debris from getting inside the pipe, and the locking mechanism prevents the pumped out liquid from returning back. A striking example of such equipment is the 16ch42r model.

Model 16ch42r – check valve for large pumps. 16h42r fittings are produced mainly from steel or cast iron. The 16ch42r valve is good for its versatility. It shows itself effectively in the production of both water and oil and gas.

Connection types

This type differs in the method or location of connection.

Select valve:

• flanged;
• Wafer;
• welded coupling;
• coupling threaded.

The flanged model has flanges welded onto the ends of the body. It is specifically designed to solve problems in industrial areas or large-scale civil water supply systems.

The wafer valve is characterized by the absence of fastening elements as such. It looks like a short (up to 10 cm wide) piece of pipe with valves. It does not need to be welded or screwed, just place between flanges, or rather, seal them, and then tighten the flanges with long studs.

Contrary to popular belief, the wafer pattern holds up, provided it is installed correctly and well secured, no worse than its counterparts with a more traditional approach.

Coupling models are designed for installation on medium and small pipelines with DN25-D32. Quite rarely, coupling samples with DN50 or more are found. The welded coupling element is accordingly welded to the pipes, and the threaded element is oriented for installation by screwing union nuts onto a pre-prepared thread.

Wafer check valve and its subtypes (video)

Pressure and nominal diameter

In terms of characteristics, when choosing, pay attention to the diameter conditional passage and pressure.

Working pressure is marked with the abbreviation RU. For example, adding the entry RU16 in the name means that we have a fitting that can withstand a nominal pressure of 16 bar. It is assumed that at this pressure level it operates without any wastage or excessive wear.

The approximate diameter is indicated by the abbreviation DU. Accordingly, a valve with DN25 in the name will have a nominal diameter of approximately 25 mm, with DN32 - 32 mm, with DN100 - 100 mm, etc.

The remote control determines where we can use the fitting and for what purposes. The valve's remote control must necessarily correspond to the remote control of its adjacent parts. A check valve with DN80 can be connected to pipes and fittings only with DN80 and nothing else.

As a rule, small-sized models such as DU25 - DU50 are used for civil pipelines and are focused primarily on, and anything larger is industrial products.