Self-suction sewage pump and check valve structure

Abstract

The invention relates to the field of check valves, in particular to a self-suction sewage pump and check valve structure which comprises a check valve body, the check valve body comprises a middle through section, a water inlet is formed in one end of the middle through section, a water outlet is formed in the other end of the middle through section, and a sealing ring is installed on the lower portion in the middle through section. A sealing piston is installed on the upper side of the middle of the sealing ring, a sliding sleeve is installed in the middle of the top end of the sealing piston, a limiting sleeve is slidably connected into the sliding sleeve, a reset spring is arranged on the inner side of the limiting sleeve, a fixing bin is arranged on the upper portion of the sealing piston, and a fixing frame is fixedly connected to the middle of the periphery of the fixing bin. Water falling back can be directly blocked on the upper portion through the fixing disc and the sealing plate, so that the fixing disc and the sealing plate can be matched with the sealing ring, double sealing of the interior of the check valve body is achieved, and check sealing work can be effectively completed.

Description

Technical Field

[0001] The invention relates to the field of check valves, and in particular to a self-priming sewage pump and a check valve structure. Background Art

[0002] In the sewage discharge system, the check valve plays a vital role. Its main function is to prevent sewage backflow, ensure the normal operation of the sewage pump and the stability of the entire drainage system. However, there are many problems in the actual application of the existing check valve. On the one hand, the sealing structure of the traditional check valve is relatively simple, and usually only relies on simple seals to achieve passage closure. During long-term use, the reset spring is prone to insufficient elasticity, resulting in the sealing piston not being able to fall back in time or not falling back in place, which greatly reduces the sealing effect and cannot effectively prevent sewage backflow. This not only increases the workload of the sewage pump, but may also cause serious damage to it and shorten the service life of the sewage pump. On the other hand, real-time detection of the internal working status of the check valve has always been a difficult problem in the industry. The existing check valve lacks an effective detection mechanism and cannot timely and accurately feedback its working status to the staff. Once a fault occurs, it is difficult to detect and repair it in time, which seriously affects the efficiency and stability of sewage discharge. Therefore, we propose a self-priming sewage pump and check valve structure to solve the above-mentioned problems. Summary of the invention

[0003] The purpose of the present invention is to solve the shortcomings of the background technology and to propose a self-priming sewage pump and a check valve structure.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is: a check valve structure, including a check valve body, the check valve body including a through section, one end of the through section is provided with a water inlet, the other end of the through section is provided with a water outlet, a sealing ring is installed at the lower part of the through section, a sealing piston is installed on the upper side of the middle part of the sealing ring, a sliding sleeve is installed at the middle part of the top end of the sealing piston, a limiting sleeve is slidably connected inside the sliding sleeve, a reset spring is provided on the inner side of the limiting sleeve, a fixed bin is provided on the upper part of the outer periphery of the fixed bin, the fixing frame is fixedly connected to the middle part of the through section, a top tube is fixedly connected to the middle part of the top end of the fixed bin, the top of the limiting sleeve is fixedly connected to the upper inner part of the top tube, and a collecting groove is provided in the middle part of the top end of the top tube.

[0005] Preferably, an outer bin is installed on the upper part of the outer periphery of the middle through section, a swivel is rotatably connected to the upper inner part of the outer bin, a fixing rod is fixedly connected to one side of the bottom of the swivel, and an opening and closing joint is installed on the bottom of the fixing rod.

[0006] Preferably, a signal transmitter is installed at the bottom of the outer warehouse, a detection ring is installed on the top of the signal transmitter, an opening and closing joint is arranged on the inner side of one end of the detection ring, and a connecting port is arranged at the other end of the detection ring, and the connecting port corresponds to the end of the opening and closing joint.

[0007] Preferably, a rotating ring is rotatably connected to the middle part of the outer circumference of the top tube, guide grooves are opened on both sides of the outer circumference of the rotating ring, guide columns are slidably connected to the inner sides of the guide grooves, the bottoms of the guide columns pass through the top of the fixed bin, and the guide columns are slidably connected to the fixed bin.

[0008] Preferably, the bottom of the guide column is fixedly connected with a fixing ring, the fixing ring is installed on the top of the sealing piston, top springs are arranged on both sides of the upper part of the fixing ring, the top springs are sleeved on the lower part of the outer periphery of the guide column, and the top springs are arranged on the inner side of the fixed bin.

[0009] Preferably, a sealing plate is fixedly connected to the top of the rotating ring, a fixed disk is provided on the upper part of the sealing plate, the fixed disk is fixedly connected to the upper part of the outer periphery of the top cylinder, and the fixed disk and the sealing plate are both provided in the upper part of the middle through section.

[0010] Preferably, a magnetic ring is embedded in the middle of the outer circumference of the sealing plate, the magnetic ring corresponds to the rotating ring, and the sealing plate and the magnetic ring are both rotatably connected to the inner side of the middle through section.

[0011] Preferably, a water outlet ring is installed on the top of the sealing ring, and evenly distributed openings are opened in the middle of the water outlet ring. The water outlet ring is slidably connected to the sealing piston, and the top of the opening is installed at the lower part of the outer periphery of the fixed warehouse.

[0012] Preferably, the fixing disk and the outer side of the middle part of the sealing plate are both provided with evenly distributed water openings, and the water openings on the fixing disk and the sealing plate correspond to each other.

[0013] Preferably, a self-priming sewage pump is used in conjunction with a check valve structure, comprising a sewage pump, wherein a check valve body is connected to a discharge flange of the sewage pump.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The closure of the check valve body is effected by the action of the spring, and the sealing ring is used to close the inner passage of the check valve body.

[0015] In the process of sealing the inside of the check valve body by means of the fixed disk and the sealing plate, the blocked water will enter into the limiting sleeve through the collecting groove on the top of the top cylinder, and then the water will enter into the sliding sleeve. The impact and water pressure of the backflowing water can further impact the sliding sleeve and the sealing piston, accelerating the falling back and resetting of the sealing piston, thereby reducing the amount of backflowing water and reducing the damage of the backflow to the sewage pump. At the same time, the backflowing water will continue to exert pressure on the sealing piston, thereby effectively improving the sealing effect between the sealing piston and the sealing ring, avoiding the situation where the reset spring is insufficient in elasticity after long-term use, resulting in poor reset sealing effect, thereby greatly extending the service life of the check valve body.

[0016] During the operation of the sewage pump, when the sealing plate rotates, the magnetic ring on the outer periphery will be driven to rotate synchronously, and the magnetic ring can use magnetic force to pull the swivel for synchronization. When the swivel rotates, the fixed rod at the bottom will drive the opening and closing joint to deflect synchronously, so that the end interface of the opening and closing joint can realize the connection and disconnection of the two ends of the detection ring, realize the opening and closing of the detection ring, and make the opening and closing of the detection ring correspond to the opening and closing of the fixed disk and the sealing plate. When the detection ring is opened, the signal transmitter will transmit the working signal to people, display the working status inside the check valve body, realize the real-time detection of the working status of the check valve body, which is beneficial to actual use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a self-priming sewage pump and a check valve body of the check valve structure of the present invention; Figure 2 It is a schematic diagram of the combined state structure of a check valve body and a sewage pump of a self-priming sewage pump and a check valve structure of the present invention; Figure 3 A schematic diagram of the internal structure of a check valve body of a self-priming sewage pump and a check valve structure of the present invention; Figure 4It is a schematic diagram of the partial structure inside the outer chamber of a self-priming sewage pump and a check valve structure of the present invention; Figure 5 It is a partial structural schematic diagram of a sealing piston of a self-priming sewage pump and a check valve structure of the present invention; Figure 6 It is a schematic diagram of the partial structure in the middle section of a self-priming sewage pump and a check valve structure of the present invention; Figure 7 It is a partial structural schematic diagram of a self-priming sewage pump and a return spring of a check valve structure of the present invention; Figure 8 The present invention is a partial structural schematic diagram of a guide column and a guide groove of a self-priming sewage pump and a check valve structure.

[0018] 1. Check valve body; 101. Water inlet; 102. Water outlet; 103. Middle section; 104. Outer compartment; 105. Water outlet; 106. Reset spring; 107. Collecting trough; 108. Fixed plate; 109. Detection ring; 110. Signal transmitter; 111. Opening; 112. Water outlet ring; 113. Sealing ring; 114. Fixed rod; 115. Swivel; 116. Fixed bracket; 117. Opening and closing joint; 118. Sliding sleeve; 119. Top spring; 120. Sealing piston; 121. Fixed ring; 122. Magnetic ring; 123. Fixed compartment; 124. Limit sleeve; 125. Top cylinder; 126. Guide column; 127. Guide groove; 128. Rotating ring; 129. Sealing plate; 2. Sewage pump. DETAILED DESCRIPTION

[0019] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0020] like Figure 1-Figure 8 The check valve structure shown in the figure includes a check valve body 1, the check valve body 1 includes a middle section 103, one end of the middle section 103 is provided with a water inlet 101, the other end of the middle section 103 is provided with a water outlet 102, a sealing ring 113 is installed in the lower part of the middle section 103, a sealing piston 120 is installed on the upper side of the middle part of the sealing ring 113, a sliding sleeve 118 is installed in the middle of the top of the sealing piston 120, and the sliding sleeve 118 is internally slidably connected to a limited position sleeve The inner side of the limiting sleeve 124 is provided with a return spring 106, the upper part of the sealing piston 120 is provided with a fixed chamber 123, the middle part of the outer periphery of the fixed chamber 123 is fixedly connected with a fixing frame 116, the fixing frame 116 is fixedly connected to the middle part of the middle through section 103, the middle part of the top of the fixed chamber 123 is fixedly connected with a top chamber 125, the top of the limiting sleeve 124 is fixedly connected to the inner upper part of the top chamber 125, and the middle part of the top of the top chamber 125 is provided with a collecting groove 107; Furthermore, in a specific implementation, when water is discharged by the sewage pump 2, it will enter the inside of the check valve body 1 through the water inlet 101, and the entered water will impact the sealing piston 120, so that the sealing piston 120 will be forced to retract. When the sealing piston 120 is forced to retract into the fixed chamber 123, the opening 111 on the water outlet ring 112 will be exposed. At this time, the entered water will be discharged through the opening 111 on the edge, and discharged further upward through the water passage 105, and finally discharged into the drainage pipe through the water outlet 102, completing the drainage work of the sewage pump 2. When the sewage pump 2 stops working and no longer drains water, under the action of the rebound force of the reset spring 106, the sealing piston 120 will be reset, so that the sealing piston 120 will fall and cooperate with the sealing ring 113, thereby closing the internal passage of the check valve body 1 and completing the check valve. When the check valve body 1 is working, in the process of sealing the inside of the check valve body 1 by the fixed disk 108 and the sealing plate 129, the blocked water will enter the limiting sleeve 124 through the collecting groove 107 on the top of the top cylinder 125, and then the water will enter the sliding sleeve 118. The impact and water pressure of the reflux water can further impact the sliding sleeve 118 and the sealing piston 120, accelerate the fall and reset of the sealing piston 120, thereby reducing the amount of reflux water and reducing the damage of the backflow to the sewage pump 2. At the same time, the reflux water will continue to exert pressure on the sealing piston 120, thereby effectively improving the sealing effect between the sealing piston 120 and the sealing ring 113, avoiding the situation where the reset spring 106 is insufficient in elasticity after long-term use, resulting in poor reset sealing effect, thereby greatly extending the service life of the check valve body 1.

[0021] Among them, an outer bin 104 is installed on the upper part of the outer periphery of the middle through section 103, a swivel 115 is rotatably connected to the upper inner part of the outer bin 104, a fixed rod 114 is fixedly connected to one side of the bottom of the swivel 115, an opening and closing joint 117 is installed at the bottom of the fixed rod 114, a signal transmitter 110 is installed at the bottom of the outer bin 104, a detection ring 109 is installed on the top of the signal transmitter 110, an opening and closing joint 117 is arranged on the inner side of one end of the detection ring 109, and a connecting port is arranged at the other end of the detection ring 109, and the connecting port corresponds to the end of the opening and closing joint 117; Furthermore, in a specific implementation, when the sealing plate 129 rotates, the outer magnetic ring 122 will be driven to rotate synchronously, and the magnetic ring 122 can utilize magnetic force to pull the swivel 115 for synchronization. When the swivel 115 rotates, the bottom fixed rod 114 will drive the opening and closing joint 117 to deflect synchronously, so that the end interface of the opening and closing joint 117 can realize the connection and disconnection of the two ends of the detection ring 109, and realize the opening and closing of the detection ring 109, so that the opening and closing of the detection ring 109 can correspond to the opening and closing of the fixed disk 108 and the sealing plate 129. When the detection ring 109 is opened, the signal transmitter 110 will transmit a working signal to people, displaying the working status inside the check valve body 1, and realizing real-time detection of the working status of the check valve body 1, which is beneficial to actual use.

[0022] Among them, the bottom of the guide column 126 is fixedly connected with a fixing ring 121, and the fixing ring 121 is installed on the top of the sealing piston 120. Top springs 119 are arranged on both sides of the upper part of the fixing ring 121. The top springs 119 are sleeved on the lower part of the outer periphery of the guide column 126. The top springs 119 are arranged on the inner side of the fixed bin 123. A water outlet ring 112 is installed on the top of the sealing ring 113. The middle part of the water outlet ring 112 is provided with evenly distributed openings 111. The water outlet ring 112 is slidably connected with the sealing piston 120, and the top of the opening 111 is installed on the lower part of the outer periphery of the fixed bin 123. Furthermore, in a specific implementation, when the sewage pump 2 is working, when the sealing piston 120 is lifted, the guide column 126 will be driven to rise synchronously through the fixed ring 121, and the rotating ring 128 can be driven to deflect and drive the sealing plate 129 to rotate through the guide groove 127, so that the water port 105 on the sealing plate 129 can correspond to the water port 105 on the fixed disk 108, thereby realizing the opening of the internal passage of the check valve body 1, and facilitating drainage.

[0023] The middle of the outer periphery of the top cylinder 125 is rotatably connected with a rotating ring 128, guide grooves 127 are provided on both sides of the outer periphery of the rotating ring 128, guide posts 126 are slidably connected to the inner sides of the guide grooves 127, the bottoms of the guide posts 126 pass through the top of the fixed bin 123, the guide posts 126 are slidably connected to the fixed bin 123, the top of the rotating ring 128 is fixedly connected with a sealing plate 129, the upper part of the sealing plate 129 is provided with a fixed disk 108, and the fixed disk 108 is fixedly connected to the top cylinder 125, the fixed disk 108 and the sealing plate 129 are both arranged at the inner upper part of the middle through section 103, the middle part of the outer circumference of the sealing plate 129 is inlaid with a magnetic ring 122, the magnetic ring 122 corresponds to the rotating ring 115, the sealing plate 129 and the magnetic ring 122 are both rotatably connected to the inner side of the middle through section 103, the fixed disk 108 and the sealing plate 129 are both opened at the outer side of the middle part with uniformly distributed water holes 105, and the water holes 105 on the fixed disk 108 and the sealing plate 129 correspond to each other; Furthermore, in the specific implementation, under the action of the rebound force of the top spring 119, the fixing ring 121 can be pressed down by the top spring 119, and the guide column 126 can be driven to descend synchronously by the fixing ring 121. When the guide column 126 is driven to descend, the end of the guide column 126 will drive the rotating ring 128 to deflect through the guide groove 127, and the rotating ring 128 can drive the sealing plate 129 to deflect synchronously, so that the sealing plate 129 and the water outlet 105 on the fixed disk 108 will be misaligned. At this time, the fixed disk 108 and the sealing plate 129 can be combined to complete the closure of the upper part of the check valve body 1, and the fixed disk 108 and the sealing plate 129 can directly complete the interception of the falling water at the upper part, so that it can cooperate with the sealing ring 113 to realize the double closure of the inside of the check valve body 1, so that the check closure work can be effectively completed, which is beneficial to practical use.

[0024] Among them, a self-priming sewage pump is used in conjunction with a check valve structure, including a sewage pump 2, and a check valve body 1 is connected to the discharge flange of the sewage pump 2; Furthermore, in a specific implementation, the check valve body 1 can be installed on the sewage pump 2, so that when the check valve body 1 drains water, water can be prevented from flowing back and backwashing the sewage pump 2 can be avoided.

[0025] Working principle: In actual use, people can install the check valve body 1 on the sewage pump 2, so that when the check valve body 1 drains water, water can be prevented from flowing back and backflowing, and the sewage pump 2 can be avoided from backwashing. When water is discharged by the sewage pump 2, it will enter the check valve body 1 through the water inlet 101. The incoming water will impact the sealing piston 120, so that the sealing piston 120 will be forced to retract. When the sealing piston 120 is forced to retract into the fixed chamber 123, the opening 111 on the water outlet ring 112 will be exposed. At this time, the incoming water will be discharged through the opening 111 on the edge, and discharged further upward through the water outlet 105, and finally discharged into the drainage pipe through the water outlet 102, completing the drainage work of the sewage pump 2. When the sewage pump 2 stops When the check valve 108 stops working and no longer drains water, the sealing piston 120 will be reset under the action of the rebound force of the reset spring 106, so that the sealing piston 120 will fall and cooperate with the sealing ring 113 to close the internal passage of the check valve body 1 and complete the check work. At the same time, under the action of the rebound force of the top spring 119, the fixing ring 121 can be pressed down by the top spring 119, and the guide column 126 can be driven to drop synchronously through the fixing ring 121. When the guide column 126 is driven to drop, the end of the guide column 126 will drive the rotating ring 128 to deflect through the guide groove 127, and the sealing plate 129 can be driven to deflect synchronously through the rotating ring 128, so that the sealing plate 129 and the water outlet 105 on the fixed disk 108 will be misaligned. At this time, the fixing disk 108 It can be combined with the sealing plate 129 to complete the sealing of the upper part of the check valve body 1. The fixed disk 108 and the sealing plate 129 can directly block the falling water at the upper part, so that it can cooperate with the sealing ring 113 to achieve double sealing of the inside of the check valve body 1, so that the check sealing work can be effectively completed, which is beneficial to practical use. In the process of sealing the inside of the check valve body 1 by the fixed disk 108 and the sealing plate 129, the blocked water will enter the limiting sleeve 124 through the collecting groove 107 at the top of the top cylinder 125, and then the water will enter the sliding sleeve 118. The impact and water pressure of the backflowing water can further impact the sliding sleeve 118 and the sealing piston 120, thereby accelerating the falling and The check valve 102 is reset, thereby reducing the amount of backflow water and reducing the damage of the backflow to the sewage pump 2. At the same time, the backflow water will continue to exert pressure on the sealing piston 120, thereby effectively improving the sealing effect between the sealing piston 120 and the sealing ring 113, and avoiding the situation where the reset spring 106 is insufficient in elasticity after long-term use, resulting in poor reset sealing effect, thereby greatly extending the service life of the check valve body 1. When the sewage pump 2 is working, when the sealing piston 120 is lifted, the guide column 126 will be driven to rise synchronously through the fixing ring 121, and the guide groove 127 can drive the rotating ring 128 to deflect and drive the sealing plate 129 to rotate, so that the water inlet 105 on the sealing plate 129 can correspond to the water inlet 105 on the fixing plate 108.The opening of the internal passage of the check valve body 1 is realized, which is convenient for drainage. When the sealing plate 129 rotates, the outer magnetic ring 122 will be driven to rotate synchronously. The magnetic ring 122 can use magnetic force to pull the rotating ring 115 for synchronization. When the rotating ring 115 rotates, the bottom fixed rod 114 will drive the opening and closing joint 117 to deflect synchronously, so that the end interface of the opening and closing joint 117 can realize the connection and disconnection of the two ends of the detection ring 109, realize the opening and closing of the detection ring 109, and make the opening and closing of the detection ring 109 correspond to the opening and closing of the fixed disk 108 and the sealing plate 129. When the detection ring 109 is opened, the signal transmitter 110 will transmit a working signal to people, displaying the working state inside the check valve body 1, and realizing real-time detection of the working state of the check valve body 1, which is conducive to actual use.

[0026] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A check valve structure, comprising a check valve body (1), characterized in that: The check valve body (1) comprises a central through section (103), one end of the central through section (103) is provided with a water inlet (101), the other end of the central through section (103) is provided with a water outlet (102), a sealing ring (113) is installed at the lower part of the central through section (103), a sealing piston (120) is installed at the upper side of the middle part of the sealing ring (113), a sliding sleeve (118) is installed at the middle part of the top end of the sealing piston (120), the sliding sleeve (118) is slidably connected to a limiting sleeve (124) inside, and the limiting sleeve A return spring (106) is arranged on the inner side of the cylinder (124); a fixed chamber (123) is arranged on the upper part of the sealing piston (120); a fixed frame (116) is fixedly connected to the middle part of the outer periphery of the fixed chamber (123); the fixed frame (116) is fixedly connected to the middle part of the inner side of the middle through section (103); a top cylinder (125) is fixedly connected to the middle part of the top end of the fixed chamber (123); the top of the limiting sleeve (124) is fixedly connected to the upper inner side of the top cylinder (125); and a collecting groove (107) is provided in the middle part of the top end of the top cylinder (125).

2. A check valve structure according to claim 1, characterized in that: An outer bin (104) is installed on the upper outer portion of the central through section (103); a swivel (115) is rotatably connected to the upper inner portion of the outer bin (104); a fixing rod (114) is fixedly connected to one side of the bottom of the swivel (115); and an opening and closing joint (117) is installed on the bottom of the fixing rod (114).

3. A check valve structure according to claim 2, characterized in that: A signal transmitter (110) is installed at the bottom of the outer compartment (104), a detection ring (109) is installed at the top of the signal transmitter (110), an opening and closing joint (117) is provided on the inner side of one end of the detection ring (109), and a connecting port is provided at the other end of the detection ring (109), the connecting port corresponding to the end of the opening and closing joint (117).

4. A check valve structure according to claim 1, characterized in that: A rotating ring (128) is rotatably connected to the middle of the outer circumference of the top cylinder (125), guide grooves (127) are provided on both sides of the outer circumference of the rotating ring (128), guide pillars (126) are slidably connected to the inner sides of the guide grooves (127), the bottoms of the guide pillars (126) pass through the top of the fixed bin (123), and the guide pillars (126) are slidably connected to the fixed bin (123).

5. A check valve structure according to claim 4, characterized in that: The bottom of the guide column (126) is fixedly connected to a fixing ring (121), the fixing ring (121) is installed on the top of the sealing piston (120), and top springs (119) are arranged on both sides of the upper part of the fixing ring (121), the top springs (119) are sleeved on the lower part of the outer periphery of the guide column (126), and the top springs (119) are arranged on the inner side of the fixing chamber (123).

6. A check valve structure according to claim 4, characterized in that: A sealing plate (129) is fixedly connected to the top of the rotating ring (128), a fixed disk (108) is arranged on the top of the sealing plate (129), the fixed disk (108) is fixedly connected to the upper part of the outer periphery of the top cylinder (125), and the fixed disk (108) and the sealing plate (129) are both arranged in the upper part of the middle through section (103).

7. A check valve structure according to claim 6, characterized in that: A magnetic ring (122) is embedded in the middle of the outer circumference of the sealing plate (129), the magnetic ring (122) corresponds to the rotating ring (115), and the sealing plate (129) and the magnetic ring (122) are both rotatably connected to the inner side of the middle through section (103).

8. A check valve structure according to claim 1, characterized in that: A water outlet ring (112) is installed on the top of the sealing ring (113), and evenly distributed openings (111) are provided in the middle of the water outlet ring (112). The water outlet ring (112) is slidably connected to the sealing piston (120), and the top of the opening (111) is installed at the lower part of the outer periphery of the fixed chamber (123).

9. A check valve structure according to claim 6, characterized in that: The fixed disk (108) and the sealing plate (129) are both provided with evenly distributed water openings (105) on the outer sides of the middle parts, and the water openings (105) on the fixed disk (108) and the sealing plate (129) correspond to each other.

10. A self-priming sewage pump, used in conjunction with a check valve structure according to any one of claims 1 to 9, comprising a sewage pump (2), characterized in that: The discharge outlet flange of the sewage pump (2) is connected to a check valve body (1).

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