CN116324244A

CN116324244A - Isolator (backflow preventer)

Info

Publication number: CN116324244A
Application number: CN202180065151.3A
Authority: CN
Inventors: 穆斯塔法·塞尔达·图泰克
Original assignee: Zelda Plastic Industry And Trade Co ltd
Current assignee: Zelda Plastic Industry And Trade Co ltd
Priority date: 2020-08-21
Filing date: 2021-08-20
Publication date: 2023-06-23
Also published as: EP4200484A1; WO2022039710A1; TR202013269A1

Abstract

The present invention relates to a valve for controlling the flow through and its pressure dependent direction in combination boilers and similar devices. The valve is defined as an isolator product having a double check valve that prevents system water from passing into the tap water and drain system. The valve adopts a seamless main body structure, has compact structure, is made of thermoplastic materials, and is resistant to high temperature and high pressure. The protruding outer ribs thereof provide an aesthetic appearance. The valve is a backflow preventer for protecting users and systems in combination boilers and similar devices. The backflow preventer is a double check valve assembly that does not allow the passage of used water back to the mains water system. The operating mechanism is configured to ensure that the discharge of outlet water does not enter the inlet water if the outlet check valve/check valve fails for reasons when the outlet pressure is greater than the supply pressure. The solution for the backflow preventer, which is the subject of the present invention, is to prevent the contamination of drinking water by preventing the mixing of the installed water with tap water in combination boilers and similar devices.

Description

Isolator (backflow preventer)

The present invention relates to a valve for controlling the flow through and its pressure dependent direction in combination boilers and similar devices. The valve is defined as an isolator product having a double check valve that prevents system water from passing into the tap water and drain system. The valve adopts a seamless main body structure, has a compact structure, is made of thermoplastic materials, and is resistant to high temperature and high pressure. The protruding outer rib provides an aesthetic appearance. The valve is a backflow preventer for protecting users and systems in combination boilers and similar devices. The backflow preventer is a double check valve assembly that does not allow the passage of used water back to the mains water system. The operating mechanism is configured to ensure that the outlet water is discharged without entering the feed water if the outlet check valve/check valve fails for reasons when the outlet pressure is greater than the feed pressure. The aim is to prevent the passage of system water into the tap water and thus to avoid contamination of the drinking water in combination boilers and similar devices.

Technical Field

The present invention relates to a component for flow control that manages the passage of water and similar fluids in combination boilers and similar devices. Such through control and discharge valves are an inlet and outlet element that opens and closes depending on the specific conditions in the system containing the fluid. It is used to isolate the pressure differential between the pressure created by the fluid in one conduit and the pressure created by the fluid in another conduit in the same system. It is a backflow preventer for protecting users and systems in combination boilers and similar devices from contamination.

The approval of potable hot water from KTS in germany or WRAS in the united kingdom aims at closed circuit feedwater, as well as preventing mixing of potable water with contaminated water in such feedwater systems.

Background

The present invention relates to a valve with a seamless body structure made of thermoplastic material, which is light and compact in volume, resistant to high temperatures, corrosion, chemicals and pressure, which can control the flow of water and similar fluids, and which is designed to enable flow in combination boilers and similar devices.

Metal valves and cellular heating systems, which are commonly used in combination boilers and similar devices, lead to rust and become difficult to control over time. Their bodies are also heavier than thermoplastic valves. The thermoplastic isolator unit of the backflow preventer is lighter without any risk of corrosion. However, the tolerance accuracy is lower than for similar metal products, making their production and design process more challenging. By its design, the device of the invention is a leading edge product installed using a bonding system and having high pressure resistance; wherein problems related to tolerances have been eliminated using static sealing members and wherein problems related to friction in the sealing members have been overcome using tapered contact systems.

The device of the present invention not only regulates fluid delivery by controlling water flow, but also prevents backflow to protect users and systems in combination boilers and similar devices. The system consists of a body that includes a fluid passing system (in which opening, closing and evacuation takes place), a check valve system and a moving element, and two interface components connecting the fluid and surrounding elements. As long as the supply pressure is greater than the outlet pressure, it provides unidirectional controlled flow. On the other hand, if the outlet pressure is greater than the supply pressure, it will prevent backflow. Even if the outlet check valve preventing backflow malfunctions, it can prevent the feed water from being contaminated by discharging the outlet pressure into the atmosphere.

Disclosure of Invention

The present invention may be described as an isolator product having a double check valve that prevents system water from passing into the tap water and drain system. In summary, the principle of operation of the system is that the check valve and static sealing element close the discharge opening, control the flow of incoming fluid at a certain pressure in the inlet pipe and ensure that the water flowing to the device flows to the outlet. If the outlet check valve fails to function properly even after the supply pressure is lost, the return valve will prevent back flow and safely drain fluid. Thus, the device of the present invention protects the user, system and environment from contaminating fluids.

The present invention relates to a valve having a seamless body made of thermoplastic material, which is lightweight and compact, resistant to high temperatures, corrosion, chemicals and high pressures, and which can control the flow of water and similar fluids in combination boilers and similar devices. The valve unit consists of 4 parts: an inlet, an outlet, an isolator, and a discharge bank. The structure is formed by mounting different types of inlet and outlet fittings on a body containing the drain and isolator portions. The isolator section is comprised of a check valve set with a static sealing element disposed on the flexible diaphragm and a dynamic sealing element disposed in the flexible diaphragm.

Drawings

Fig. 1 is a front view of an isolator (backflow preventer);

fig. 2 is a rear view of the separator (backflow preventer);

fig. 3 is a side view of the separator (backflow preventer);

fig. 4 is a plan view of the separator (backflow preventer);

fig. 5 is a bottom view of the separator (backflow preventer);

fig. 6 is a cross-sectional view of the separator (backflow preventer).

Reference numerals and signs refer to

1-inlet interface unit

2-film

3-inlet valve body

4-O-ring

5-inlet valve

6-inlet valve spring

7-O-ring

8-inlet valve cover

9-body

10-O-ring

11-outlet valve

12-outlet valve spring

13-O-ring

14-outlet interface component

15-discharge channel

Detailed Description

The first part of the isolator body portion is formed by extruding a static sealing diaphragm (2), said static sealing diaphragm (2) being disposed in the body between the inlet piece and the body portion (3). The second part is formed by placing an inlet check valve set in the membrane (2) in the set. In addition, there is an O-ring that presses against a tapered surface in the body to provide a dynamic seal for the isolator valve bank that separates the bank from the drain. The set not only allows one-way flow of fluid from the inlet to the outlet, preventing backflow of fluid, but also ensures that contaminated fluid is discharged in the event of a drop in supply pressure and failure of the outlet check valve. Due to its bellows design, the special membrane (2) can be operated even at a lower pressure difference than in the known art.

By the special membrane (2) design with its own O-ring no extra sealing element on the inlet interface member (1) is required. In order to bring the dynamic O-ring into full contact and seal with all surfaces, the corresponding contact surfaces are shaped as a fully friction-resistant conical structure. Because it works without friction, it provides a more durable and reliable seal. Due to the low friction of the sealing element, a more sensitive isolator is obtained which can react to lower pressure differences.

An input interface (1) is attached to the front of the body portion. In this way it can easily be adapted to different systems.

On the other hand, the outlet portion is formed by placing a check valve at the inlet to ensure one-way water passage and connecting the mouthpiece to the outlet.

Diagonal (undercut) refers to a pattern on an axis perpendicular to the parting line in a plastic mold. A core refers to a mold element that is operated by different kinds of movements to mold undercuts in a mold.

The parts of the interface (1) to the inlet and the interface (14) to the outlet are parts produced in a production mould without the need for an additional core and have a flexible claw-lock system. In this way it can be grouped without any additional parts (e.g. washers), without torsion in the sealing element and without any threaded engagement. By changing the front interface part (1) and the rear interface part (14), new valve groups can be manufactured at low cost, providing a quick and economical solution for different devices and different applications without affecting the main system.

The object of the present product is to prevent mixing and contamination of outlet water with inlet water by providing outlet water discharge in case of failure of the outlet check valve (in case of outlet pressure higher than inlet pressure).

The check valves in the product are of unitary construction because they utilize the body member as the inlet-outlet support and sealing element. Due to the functional components within the body, the isolator (backflow preventer) is composed of fewer components. The sealing surfaces of the inlet interface member (1) and the outlet interface member (14) are shaped without molded joint surfaces. Thus, these areas do not present sealing problems.

The operating mechanism of the isolator (backflow preventer) of the present application can be defined as two main titles: a filling stage and an emptying stage.

A filling process;

in the first stage, as the pressure of the tap water applied to the inlet side of the isolator (1) increases sufficiently to push the inlet membrane (2), the membrane (2) becomes flexible and squeezes to close the discharge inlet/passage which opens into the interior of the isolator body by means of an O-ring (7) located outside the inlet check valve body (3). Thus, the discharge passage (15) is closed. The middle portion becomes isolated. In the second phase, when the main pressure increases sufficiently to overcome the force of the inlet check valve spring (6), it pushes the inlet check valve torpedo (5) back, filling the middle part with water. At the same time, the O-ring (7) outside the inlet check valve body (3) continues to block the discharge port (15). For this reason, water is not discharged because this part is isolated. When the water pressure in the intermediate section increases sufficiently to overcome the force of the outlet check valve cone (11), it pushes the outlet check valve torpedo (11) back and tap water flows into the system piping.

A discharge process;

when the system pressure is greater than "0" bar, if the outlet check valve (11) fails to close the passage for any reason (failure), and at the same time, if the main pressure is lower than the system pressure for any reason, the inlet check valve body (3) and the membrane (2) are pulled back and moved toward the system side due to the generated reverse pressure difference. In this way, the O-ring (7) on the inlet check valve (3) separates from the inner surface of the body, opening the discharge passage. Since the main pipe side does not have a line blocking water, water flows through the main pipe side discharge portion (15) until the system pressure is equal to the atmospheric pressure. In special cases, if the downstream outlet check valve (11) fails, the discharge valve opens to discharge contaminated fluid. The device is a positive effect device and the isolator provides a high level of safety in any event.

Claims

1. A valve for controlling the flow and pressure dependent direction of a fluid in a combination boiler and the like, characterized in that the valve is an isolator product having a double check valve preventing the passage of system water into the tap water and drain system.

2. A valve for controlling the flow through and its pressure dependent direction in combination boilers and similar devices, characterized in that the front inlet (1) and the rear outlet connection interface part (14) have a flexible claw lock system produced in a mould, without the need of an additional core.

3. A valve for controlling the flow through and the pressure related direction thereof in combination boilers and similar devices, c h a r a c t e r i z e d in that by changing the front inlet (1) and rear outlet interface (14) components, a new valve block with front inlet (1) and rear outlet interface (14) can be created for different devices and for different applications without affecting the main system.

4. The valve of the invention for controlling the flow through and the pressure related direction of a fluid in combination boilers and similar devices is characterized in that the corresponding contact surfaces are shaped as a perfectly friction-resistant cone so that the dynamic O-ring can smoothly contact all surfaces and provide a seal.

5. A valve for controlling the flow of fluid through and its pressure dependent direction in combination boilers and similar devices, characterized in that said valve operates more sensitively by reacting to lower pressure differences by means of the fact that the sealing element operates with low friction.

6. A valve for controlling the flow through and the pressure-dependent direction of a fluid in a combination boiler and the like, characterized in that the membrane (2) can be operated at a much lower pressure difference than in the known art by means of its bellows structure.

7. A valve for controlling the flow through and its pressure dependent direction in combination boilers and similar devices, characterized in that the main structure of the valve is designed by its own O-ring and bellows membrane (2) without the need for additional sealing elements on the side of the inlet interface member (1).

8. A valve for controlling the flow of fluid through and its pressure-dependent direction in combination boilers and similar devices, characterized in that the valve has a one-piece construction, since the non-return valve in the product uses a body part as a supporting and sealing element for the inlet (3) -outlet (11).

9. A valve for controlling the flow of fluid through and its pressure dependent direction in combination boilers and similar devices, characterized in that the sealing surfaces of the inlet (1) and outlet (14) interface members are shaped without molded joints, thereby providing a seal in these areas.

10. A valve for controlling the flow of fluids and their pressure-dependent direction in combination boilers and similar devices, characterized in that the valve is a valve made of thermoplastic material, has a light and compact size, and is resistant to high temperatures, corrosion, chemicals and high pressures.