Italy ATOS one-way valve Guanglian*

Working principle of ATOS one-way valve in Italy

The Italian ATOS one-way valve is a valve used to control the one-way flow of fluids. Its working principle is mainly based on the pressure of the fluid and the mechanical structure inside the valve. The following is the working principle and related precautions of ATOS one-way valve:

working principle

Fluid flow direction:

A one-way valve allows fluid to flow freely in one direction, while blocking fluid flow in the opposite direction.

When the fluid flows from the inlet to the outlet, the fluid pressure pushes the valve disc open and the fluid passes through the valve.

When the fluid attempts to flow from the outlet to the inlet, the fluid pressure pushes the valve disc to close, preventing the fluid from flowing in the opposite direction.

Valve disc and sealing components:

The valve disc is a key component of a one-way valve, which opens or closes under the action of fluid pressure.

The sealing component ensures that the valve can prevent reverse fluid flow when closed.

Anti backflow mechanism:

The spring or gravity inside the one-way valve helps the valve disc remain closed in the absence of positive fluid pressure.

When the positive fluid pressure overcomes the spring force or gravity, the valve disc opens and the fluid passes through.

Installation and usage precautions

Packaging and Handling:

When moving or transporting one-way valves, the original packaging should be kept to avoid arbitrary disassembly or modification.

Avoid hard pulling or falling from a height to prevent damage to the valve body.

Preparation before installation:

Before installation, the dust, sand, and welding slag inside the pipeline should be cleaned to ensure its cleanliness.

Confirm the flow direction indicated on the valve body (arrow direction), and the fluid flow direction during installation should be consistent with the direction indicated by the arrow.

Precautions during installation:

When using a threaded valve, it should be installed according to the specified thread specifications to avoid deformation of the valve body caused by excessive tightness.

Stick sealing tape on the threaded part of one side of the pipeline to prevent leakage.

Usage and maintenance:

Regularly check the sealing performance of the valve to ensure that it can prevent reverse fluid flow when closed.

When using high-temperature fluids such as steam, be careful to prevent the sealing components from becoming loose due to heat, which could lead to leakage.

Conclusion

The Italian ATOS one-way valve achieves unidirectional fluid flow by controlling the opening and closing of the valve disc. Its working principle is simple and reliable, and it is widely used in various fluid control systems. During installation and use, attention should be paid to maintaining the cleanliness and correct installation direction of the valve to ensure its normal operation and extend its service life.

The characteristics and functions of the Italian ATOS one-way valve are as follows:

Characteristic: The Italian ATOS one-way valve is a device where fluid can only flow along the inlet, but the outlet medium cannot flow back. One way valve, also known as check valve or check valve. Used to prevent reverse flow of oil in hydraulic systems, or to prevent reverse flow of compressed air in pneumatic systems.

Function: The main function of the Italian ATOS one-way valve is to restrict the flow of oil in only one direction and not in the opposite direction. The structure and principle of one-way valves are relatively simple, but they are one of the commonly used components in hydraulic systems. Proper selection and reasonable application of one-way valves can not only meet the various functional requirements of hydraulic systems in different application scenarios, but also simplify the design of hydraulic systems. Almost all hydraulic systems use ATOS check valves because they are the simplest of all hydraulic valves, with a simple structure and principle, and are applied in every system. Its basic applications are manifested in three aspects:

Protect the hydraulic pump (firstly, prevent residual pressure in the system from causing the hydraulic pump motor to reverse when the motor stops; secondly, prevent sudden increase in system pressure during system operation from damaging the hydraulic pump);

For the M/H/K type electro-hydraulic directional valve with a main valve center function, when formed by internal pressure oil control, a one-way valve is used as a back pressure valve to ensure the control of oil pressure and normal directional control;

The one-way valve is combined into a composite valve. Such as one-way sequence valve, one-way pressure reducing valve, one-way throttle valve, one-way speed regulating valve, rectifier plate, shuttle valve, etc. Another special feature is the hydraulic control one-way valve and the filling valve.

In summary, the Italian ATOS one-way valve has important characteristics and functions, playing an irreplaceable role in hydraulic systems.

The use and maintenance of ATOS one-way valves in Italy include the following aspects:

Storage and handling: When storing and handling valves, the pressure on the sealing components decreases, which can cause screws and nuts to loosen. To avoid leakage caused by this, it is necessary to tighten each screw before use.

High temperature fluid use: When using high-temperature fluids such as steam, the pressure on the sealing components decreases, and the tightened screws may loosen due to heat, resulting in leakage. Therefore, the loosened screws should be tightened immediately.

Tightening under pressure: It is prohibited to perform fastening operations under pressure, as it may damage the sealing components. Tightening operations should only be carried out after the pressure inside the pipeline has returned to its original state.

Tightening operation: The parts that need to be tightened should be kept in a certain horizontal state and reinforced evenly, otherwise it will damage the components or increase the torque at the handle switch.

Pipeline construction: In case of freezing or water spraying during pipeline construction, effective measures should be taken in a timely manner.

Cleaning after pipeline construction: After the pipeline construction is completed, all valves on the pipeline route should be opened and residual dirt should be removed.

Disassembly and installation: When removing valves from pipelines, the fluid inside the pipeline should be released only after the pressure returns to atmospheric pressure. Especially for pipeline lines that use hazardous fluids (toxic, flammable, gasifying fluids, etc.), attention should be paid to the characteristics of the fluid and safety measures should be taken. When installing after disassembly, replace the same type and brand new sealing components such as packing, rubber, and valve seat, and confirm whether each connecting component is damaged.

Leakage of stuffing box: Leakage of one-way valve stuffing box is the main aspect of running, emitting, dripping, and leaking. The reasons for stuffing box leakage often seen in factories are as follows: the corrosiveness, temperature, and pressure of the packing and working medium are not compatible; The loading method is incorrect, especially when the entire packing is placed in a spiral manner, which is most likely to cause leakage; The machining accuracy or surface smoothness of the valve stem is insufficient, or there is ovality or scoring; The valve stem has pitting corrosion or rusted due to lack of protection in the open air; Valve stem bending; The filler has been used for too long and has aged; The operation is too aggressive. The method to eliminate packing leakage is to select packing correctly; Fill correctly; If the valve stem processing is not qualified, it should be repaired or replaced, and the surface smoothness should reach 0.2 μ m or above. More importantly, it should reach 0.1 μ m or above, and there should be no other defects; Take protective measures to prevent rusting, and replace those that have already rusted; The bent valve stem should be straightened or updated; After a certain period of use, the filler should be replaced; Attention should be paid to smooth operation, slow opening and closing to prevent sudden temperature changes or medium impact.

Closing element leakage: Usually, the leakage of the stuffing box is called external leakage, and the closing element is called internal leakage. The leakage of the closing component is difficult to detect inside the valve. There are two types of leakage in the closure: one is leakage on the sealing surface, and the other is leakage at the root of the sealing ring, which causes leakage in the one-way valve. The reasons for this are: poor grinding of the sealing surface; The sealing ring does not fit tightly with the valve seat and valve; The valve selection is not firmly connected to the valve stem; Bending and twisting of the valve stem causes the upper and lower closing components to be misaligned; Close too quickly, the sealing surface has poor contact or has already been damaged; Improper material selection, unable to withstand the corrosion of the medium; Use the globe valve and sight valve as regulating valves. The sealing surface cannot withstand the erosion of high-speed flowing media; Some media gradually cool down after the valve is closed, causing fine cracks on the sealing surface and also leading to erosion; Threaded connections are used between certain sealing surfaces and valve seats or valves, which can easily lead to oxygen concentration differences, corrosion, and loosening of the battery; The valve cannot be closed tightly due to impurities such as welding slag, rust, dust, or mechanical parts falling off and blocking the valve core in the production system. The prevention and control measures include: careful pressure and leakage testing must be conducted before use. If leakage is found on the sealing surface or at the root of the sealing ring, it must be dealt with before use; Prior inspection should be conducted to ensure that all components of the valve are in good condition, and valves with twisted or unreliable valve stem connections should not be used; The valve should be tightly closed with stable force and not with excessive force. If poor contact or obstruction is found between the sealing surfaces, it should be opened slightly immediately to allow debris to flow out, and then carefully closed; When selecting valves, not only should the corrosion resistance of the valve body be considered, but also the corrosion resistance of the closing components; To use the valve correctly according to its structural characteristics, components that require flow regulation should use regulating valves; For situations where the medium cools down and the temperature difference is large after closing the valve, the valve should be tightly closed after cooling; When the valve seat, valve, and sealing ring are connected by threads, polytetrafluoroethylene tape can be used as a filler between the threads to ensure that there are no gaps; Valves that may contain impurities should be equipped with a filter in front of the valve.

Installation position: The installation position of a one-way valve, also known as a check valve, is not limited. It is usually installed in horizontal pipelines, but can also be installed in vertical or inclined pipelines.

Installation direction: When installing a check valve, special attention should be paid to the direction of medium flow. The normal flow direction of the medium should be consistent with the direction indicated by the arrow on the valve body, otherwise it will cut off the normal flow of the medium.

Bottom valve installation: The bottom valve should be installed at the bottom end of the water pump suction pipeline.

The pressure when the check valve is closed: When the check valve is closed, water hammer pressure will be generated in the pipeline, which can seriously cause damage to the valve, pipeline or equipment, especially for large-diameter pipelines or high-pressure pipelines. Therefore, high attention should be paid to the selection of check valves.

The application of check valves: Check valves are only used as one-way opening and closing valves to prevent the backflow of fluid media on various pipelines or equipment. Atos one-way valve, also known as check valve or check valve. Used to prevent reverse flow of oil in hydraulic systems, or to prevent reverse flow of compressed air in pneumatic systems.

The types of ATOS one-way valves: There are two types of ATOS one-way valves: straight through and right angle. The straight through one-way valve is installed on the pipeline with threaded connections. There are three forms of right angle one-way valves: threaded connection, plate connection, and flange connection. Hydraulic control one-way valve, also known as blocking valve or pressure maintaining valve, is the same as one-way valve, used to prevent reverse flow of oil. But when reverse oil flow is required in the hydraulic circuit, the control oil pressure can be used to open the one-way valve, allowing oil flow in both directions. The hydraulic control one-way valve adopts a conical valve core, so it has good sealing performance. When a closed oil circuit is required, this valve can be used as a one-way locking mechanism to maintain pressure in the oil circuit.