CN205446823U - Take poor check valve of valve clack structure of opening of low pressure - Google Patents

Abstract

The utility model belongs to the technical field of check valves, and in particular relates to a check valve with a low-pressure differential opening disc structure. A check valve with a low-pressure differential opening disc structure of the utility model includes a valve body and a valve disc, and is characterized in that: the valve body has a fluid inlet channel, a valve cavity and a fluid outlet channel connected in sequence, and the valve cavity A valve clack is arranged inside, and the valve clack can block or open the communication relationship between the fluid inlet channel and the fluid outlet channel. The utility model solves the technical problem that the opening pressure difference of the disc of the existing rotary check valve is relatively large, which leads to a long opening time and reduces the safety of the reactor coolant system. The opening pressure of the check valve of the utility model The difference is not greater than 0.003MPa, and the flow resistance coefficient is not greater than 0.8 when fully open. When closed, it can be quickly and effectively closed under the action of the floating weight without affecting the sealing effect in the closed state, improving the reliability of the valve to achieve system safety indicators.

Description

A check valve with a low-pressure differential opening disc structure

technical field

The utility model belongs to the technical field of check valves, and in particular relates to a check valve with a low-pressure differential opening disc structure.

Background technique

During the accident mitigation process of floating nuclear power plants, when the water in the safety injection tank is exhausted, the medium in the recirculation pipeline is required to open the check valve under low pressure difference to form recirculation, so as to ensure the temperature of the reactor coolant system, Pressure does not exceed safe limits.

According to the analysis, the smaller the opening pressure difference of the check valve, the shorter the time for the recirculation line to establish a cycle, and the higher the safety of the reactor coolant system. At present, the disc of the valve in the primary circuit system mainly adopts the conventional structure type, resulting in a large opening pressure difference of the valve disc. The opening pressure difference of the existing swing check valve is about 0.5. Under this pressure difference, the check valve The longer turn-on time of the reactor affects the system response time, thereby reducing the safety of the reactor coolant system.

Utility model content

The technical problem to be solved by the utility model is: the opening pressure difference of the disc of the existing rotary check valve is relatively large, which leads to a long opening time and reduces the safety of the reactor coolant system.

The technical scheme of the utility model is as follows:

A check valve with a low pressure differential opening disc structure, including a valve body and a valve disc, characterized in that: the valve body has a fluid inlet channel, a valve cavity and a fluid outlet channel connected in sequence, and a valve cavity is arranged in the valve cavity. The flap, the valve flap can block or open the communication relationship between the fluid inlet channel and the fluid outlet channel.

Preferably, a valve shaft is also arranged in the valve cavity, and the valve disc is installed in the valve cavity through the valve shaft; the valve disc includes a valve plate, a balance weight and a floating weight; the valve plate is circular The plate can be covered on the fluid inlet channel to prevent the fluid from flowing back from the fluid outlet channel back to the fluid inlet channel; the balance block is arranged above the valve plate and fixed as a whole with the valve plate; the balance block and the The connecting body formed by the valve plate is installed on the valve shaft and can freely rotate around the valve shaft, and the center of gravity of the connecting body formed by the balance weight and the valve plate is located on the valve shaft; The valve disc also includes a floating weight, which is arranged on the side of the valve plate close to the fluid outlet channel, one end of the floating weight is installed on the valve shaft, and the other end is a free end, which can rotate around the valve shaft; A limiting device is also arranged on the valve cavity, which is used to limit the movement of the floating weight in the direction of increasing the opening pressure difference of the valve disc.

The beneficial effects of the utility model are:

The opening pressure difference of the check valve of the utility model is not greater than 0.003 MPa, and the flow resistance coefficient is not greater than 0.8 when fully opened. Reliability of system security indicators.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Among them, 1-valve body, 11-fluid inlet passage, 12-valve chamber, 13-fluid outlet passage, 14-valve shaft, 2-disc, 21-valve plate, 22-balance weight, 23-floating weight.

detailed description

The check valve with a low pressure differential opening disc structure of the present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

As shown in Figure 1, the check valve with a low pressure differential opening disc structure of the present utility model mainly includes a valve body 1 and a valve disc 2, and the valve body 1 has a fluid inlet channel 11, a valve cavity 12 and In the fluid outlet channel 13 , a valve flap 2 is arranged in the valve cavity 12 , and the valve flap 2 can block or open the communication relationship between the fluid inlet channel 11 and the fluid outlet channel 13 .

A valve shaft 14 is also arranged in the valve cavity 12 , and the valve clack 2 is installed in the valve cavity 12 through the valve shaft 14 . The valve flap 2 includes a valve plate 21 , a balance weight 22 and a floating weight 23 . The valve plate 21 is a circular plate that can cover the fluid inlet channel 11 to prevent the fluid from flowing back from the fluid outlet channel 13 back to the fluid inlet channel 11 . The balance weight 22 is arranged above the valve plate 21 and fixed together with the valve plate 21 . The connecting body formed by the balance weight 22 and the valve plate 21 is mounted on the valve shaft 14 and can freely rotate around the valve shaft 14. The connection body formed by the balance weight 22 and the valve plate 21 The center of gravity of the body is located on the valve axis 14. The valve clack 2 also includes a floating weight 23, which is arranged on the side of the valve plate 21 close to the fluid outlet channel 13, one end of the floating weight 23 is installed on the valve shaft 14, and the other end is a free end. , capable of rotating around the valve shaft 14 . The valve cavity 12 is also provided with a limiting device, which is used to limit the movement of the floating weight 23 in the direction of increasing the opening pressure difference of the valve disc 2 .

Under normal working conditions, the fluid flowing back from the fluid outlet channel 13 back into the valve cavity 12 provides pressure to the valve plate 21, so that the valve plate 21 blocks the communication between the fluid outlet channel 13 and the fluid inlet channel 11, preventing the fluid from further backflowing back. The fluid inlet channel 11 acts as a check.

When the water in the safety injection tank is exhausted, the fluid in the recirculation pipeline flows into the check valve from the fluid inlet channel 11, and the center of gravity of the connecting body formed by the valve plate 21 and the balance weight 22 is located above the valve shaft 14, and the valve The fluid on both sides of the plate 21 only needs a small pressure difference (not greater than 0.003MPa) to make the valve plate 21 and the balance weight 22 turn in the direction of opening the communication relationship between the fluid inlet passage 11 and the fluid outlet passage 13, and the check The valve opening increases. When the valve plate 21 rotates at a certain angle, it will contact the floating weight 23, and under the action of the fluid pressure flowing in from the fluid inlet channel 11, it will drive the floating weight 23 to rotate together until the fluid pressure and the gravity of the floating weight 23 reach a balance , the valve plate 21 stops rotating, the opening of the check valve reaches the maximum, and the flow resistance coefficient at this time meets the requirements (the flow resistance coefficient is not greater than 0.8 when fully open).

When the recirculation system is closed, the pressure of the fluid flowing into the fluid inlet channel 11 gradually decreases, and the floating weight 23 drives the valve plate 21 to rotate in the direction of blocking the communication relationship between the fluid inlet channel 11 and the fluid outlet channel 13 under the action of gravity. The return valve opening decreases. After the floating weight 23 rotates at a certain angle, it stops rotating under the action of the limit device. At this time, the valve plate 21 continues to rotate in the direction of blocking the communication relationship between the fluid inlet passage 11 and the fluid outlet passage 13 under the action of the fluid flowing back from the fluid outlet passage 13 back to the valve cavity 12, and the opening of the check valve is further reduced until The check valve is fully closed. During the closing process of the check valve, the floating weight 23 accelerates the rotation of the valve plate 21 under the action of gravity, which reduces the action time for closing the check valve.

Claims (2)

1. the check-valves of a band low voltage difference unlatching valve flap structure, including valve body (1) and flap (2), it is characterized in that: described valve body (1) has fluid inlet channel (11), valve pocket (12) and the fluid outlet channels (13) being sequentially communicated, being provided with flap (2) in valve pocket (12), flap (2) can block or open the connected relation between fluid inlet channel (11) and fluid outlet channels (13).

2. band low voltage difference as claimed in claim 1 opens the check-valves of valve flap structure, it is characterized in that: be additionally provided with valve shaft (14) in described valve pocket (12), described flap (2) is installed in valve pocket (12) by valve shaft (14)；Described flap (2) includes valve plate (21), balance weight (22) and floating heavy hammer (23)；Described valve plate (21) is circular slab, it is possible to be covered on fluid inlet channel (11), prevents fluid from reversely floing back towards fluid inlet channel (11) from fluid outlet channels (13)；Described balance weight (22) is arranged at the top of described valve plate (21), is fixed as one with valve plate (21)；The connector that described balance weight (22) and described valve plate (21) are formed is installed on described valve shaft (14), can be freely rotatable around described valve shaft (14), the position of centre of gravity of described balance weight (22) and described valve plate (21) formed connector is positioned on described valve shaft (14)；Described flap (2) also includes floating heavy hammer (23), floating heavy hammer (23) is arranged at described valve plate (21) near fluid outlet channels (13) side, one end of described floating heavy hammer (23) is installed on valve shaft (14), the other end is free end, it is possible to rotate around described valve shaft (14)；Described valve pocket is additionally provided with stopping means on (12), is used for limiting described floating heavy hammer (23) to the direction motion increasing flap (2) starting differential pressure.