CN204512445U - A kind of modulating valve - Google Patents

Abstract

The utility model discloses a regulating valve, which comprises a valve body provided with an inlet and outlet passage, a valve cover installed on the valve body and a main valve arranged in the valve body for blocking or connecting the inlet and outlet passages, the inlet and outlet passages in the valve body There is also a communication hole between them, and an auxiliary valve is arranged at the communication hole. The utility model improves the existing control valve and adds an auxiliary valve, so that when the control valve needs to operate under the condition of small opening, the main valve can be closed and the auxiliary valve can be opened, so as to solve the problem of the long-term small opening of the main valve. The impact and damage of the main spool and other equipment caused by the down operation have improved the safety and stability of the regulating valve and are suitable for popularization.

Description

a regulating valve

technical field

The utility model relates to the technical field of regulating valves.

Background technique

Due to the requirements of the process and working conditions, the existing control valves often need to maintain a small opening for a long time in the operation project, and the operation of the control valve with a small opening for a long time will have a great impact on the valve. For example: 1. When the opening is small, the sealing surface of the valve core is close to the throttle port, which will damage the sealing surface of the valve core; 2. When the throttle gap is the smallest, the flow rate is the largest, and the erosion is the most severe, which seriously affects the service life of the valve; 3. .Sharp flow rate and pressure change, when the rigidity of the valve is exceeded, the valve stability is poor, and even serious vibration occurs; 4. For the valve working in the flow-closed state, there will be jumping closing or jumping start phenomenon, and the regulating valve is within the opening Unable to adjust.

It can be seen that the structure and use of the above-mentioned existing regulating valves obviously still have deficiencies. How can we create a new regulating valve that can meet the requirements of long-term small opening operation without damaging the valve and other equipment? Valves have become an object of great need for improvement in this field.

Utility model content

The technical problem to be solved by the utility model is to provide a safe and stable regulating valve suitable for small opening operation, so that it can meet the requirements of long-term small opening operation without damaging the valve and other equipment, thereby overcoming the existing Some regulating valves are insufficient.

In order to solve the above technical problems, the utility model provides a regulating valve, which includes a valve body provided with an inlet and outlet channel, a valve cover installed on the valve body, and a main valve arranged in the valve body for blocking or connecting the inlet and outlet channels. A through hole is also opened between the inlet and outlet passages in the valve body, and an auxiliary valve is arranged at the through hole.

As a further improvement, the regulating valve further includes a regulating control device for controlling the opening and closing of the main valve and/or the auxiliary valve.

As a further improvement, the auxiliary valve includes an auxiliary valve core and an auxiliary valve rod, and the auxiliary valve core is driven by the auxiliary valve rod to open or close the auxiliary valve.

As a further improvement, the main valve includes a valve seat arranged between the inlet and outlet passages in the valve body, a flow equalizing cover arranged above the valve seat, a main valve core arranged in the flow equalizing cover, and a main valve core connected to the top end of the main valve core The main valve core is driven by the main valve rod to realize the opening and closing of the main valve and the regulation of the liquid flow in the open state.

Adopt above-mentioned technical scheme, the utility model has the following advantages at least:

The utility model is improved by adding an auxiliary valve to the existing regulating valve, so that when the regulating valve needs to operate under the condition of small opening, the main valve can be closed and the auxiliary valve can be opened, so as to solve the problem of operating under the condition of small opening for a long time. The impact and damage caused by the main valve and other equipment have improved the safety and stability of the regulating valve and are suitable for popularization.

Description of drawings

The above is only an overview of the technical solution of the utility model. In order to better understand the technical means of the utility model, the utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Fig. 1 is a structural schematic diagram of the regulating valve of the present invention.

Detailed ways

The utility model is based on the existing regulating valve, and an auxiliary valve used for small flow operation is added inside it, that is, when the opening degree of the regulating valve is less than a fixed value, the main valve in the valve is completely closed, and the auxiliary valve Open to adjust, so as to avoid the damage to the main valve core and other equipment caused by the long-term operation of the regulating valve with a small opening.

Referring to Figure 1, the regulating valve of this embodiment includes a valve body 4 provided with an inlet and outlet channel, a valve cover 1 installed on the valve body 4, and a main valve arranged in the valve body 4 for adjusting the size of the liquid flow. A valve cover gasket 2 is provided between the valve cover 1 and the valve body 4 . The main valve includes a valve seat 8 arranged between the inlet and outlet passages in the valve body 4, a flow equalizing cover 3 arranged above the valve seat 8, and a main valve core 7 arranged in the flow equalizing cover 3 and the top end of the main valve core 7. Connected main stem 6. The main valve core 7 and the valve seat 8 can realize sealing cooperation, the main valve rod 6 is set through the valve cover 1, and a sealing ring 5 is arranged between the main valve rod 6 and the valve cover 1 for sealing. The main valve core 7 moves up and down driven by the main valve rod 6 to realize the opening and closing of the main valve and the regulation of the liquid flow in the open state.

In order to reduce the damage to the main valve, the regulating valve of the utility model is also equipped with an auxiliary valve, which is arranged at the through hole 11 opened between the inlet and outlet passages in the valve body 4, and is used for the regulating valve under the condition of a small opening. During operation, it operates instead of the main valve and connects the liquid flow in and out of the channel to solve the problem of the impact and damage of the main valve core and other equipment caused by the long-term operation of the main valve with a small opening.

The auxiliary valve includes an auxiliary valve core 9 for opening or closing the through hole 11, an auxiliary valve rod 10 driving the auxiliary valve core 9 to move, and other connecting parts.

The regulating valve of the utility model also includes an adjusting control device for separately controlling the opening and closing of the main valve or the auxiliary valve, or an adjusting control device for simultaneously controlling the opening and closing of the main valve and the auxiliary valve. The above-mentioned regulating control device controls the main valve or the auxiliary valve to perform the opening or closing action according to the opening degree of the regulating valve to be operated.

When the regulating valve of the utility model is in operation, first a small opening threshold is preset in the regulating control device. When the operating opening of the regulating valve is greater than the small opening threshold, the regulating control device controls the auxiliary valve to close and the main valve to open. , and adjust the size of the liquid flow through the main valve core; when the operating opening of the regulating valve is less than or equal to the small opening threshold, the adjustment control device controls the main valve to close, the auxiliary valve to open, and adjust the liquid flow through the auxiliary valve core; Thereby avoiding damage to the main valve core and other equipment during the long-term operation of the main valve with a small opening. Therefore, the utility model can not only meet the requirements of general operating conditions, but also ensure the reliability and safety when operating with a small opening, and ensure the normal use of the regulating valve for a long time.

Certainly, the auxiliary valve in the utility model can adopt any existing valve structure, and the auxiliary valve can be applied in any field such as energy, chemical industry, food, etc., in existing control valves that require small opening operation.

The above are only preferred embodiments of the present utility model, and are not intended to limit the present utility model in any form. Those skilled in the art may use the technical content disclosed above to make some simple modifications, equivalent changes or modifications. Within the protection scope of the present utility model.

Claims (4)

1. a modulating valve, comprise be provided with access way valve body, be arranged on the valve gap on valve body and be arranged in valve body for blocking or be communicated with the main valve of access way, it is characterized in that, also offer through hole between access way in described valve body, described through hole arranges auxiliary valve.

2. modulating valve according to claim 1, is characterized in that, described modulating valve also comprises the control set for adjusting controlling described main valve and/or auxiliary valve opening and cut out.

3. modulating valve according to claim 1, is characterized in that, described auxiliary valve comprises auxiliary spool and auxiliary valve rod, and described auxiliary spool opens or closes auxiliary valve under the drive of auxiliary valve rod.

4. modulating valve according to claim 1, it is characterized in that, described main valve comprises and is arranged on valve seat in valve body between access way, is located at current-sharing cover above valve seat and the main valve plug be located in current-sharing cover and the main valve stem be connected with main valve plug top, and the liquid stream that described main valve plug realizes under the opening and closing of main valve and opening state under the drive of main valve stem regulates.