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Ball valve system for agricultural irrigation throttling and pipe water hammer protection and control method thereof

An agricultural irrigation and ball valve technology, applied in the field of ball valve system and its control, can solve the problems of shortening the service life of the device, system damage, water hammer generated in the pipeline, etc., so as to prevent the phenomenon of water hammer, eliminate the harm, and reduce the rise of the water hammer pressure. Effect

Active Publication Date: 2015-07-01
HOHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Existing ball valves are mainly used at the inlet of branch pipes. Due to their simple structure, small size, and small resistance to water flow, the disadvantage is that if they are opened or closed too quickly, water hammer will be generated in the pipes. The structure of the micro-irrigation pipe network is complicated. When the network is arranged in complex terrain such as large drop and large slope, the slope along the pipeline is steep and

Method used

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  • Ball valve system for agricultural irrigation throttling and pipe water hammer protection and control method thereof
  • Ball valve system for agricultural irrigation throttling and pipe water hammer protection and control method thereof
  • Ball valve system for agricultural irrigation throttling and pipe water hammer protection and control method thereof

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Embodiment 1

[0040] The ball valve system of this embodiment is as image 3 As shown, it is used for agricultural irrigation throttling and protection against water hammer in pipelines. Wherein the main pipe 10 and the branch pipe 9 are vertically connected, and the ball valve system of the present invention is arranged at the inlet of the branch pipe 9, and the water flow direction is as shown in the figure. The system includes a primary ball valve 21 and a secondary ball valve 22 connected in series. The valve core 5 of the primary ball valve 21 is provided with a throttling hole 16 connected with the main flow hole 6 . seat. The valve body 1 is made of hard material such as stainless steel, and the valve seat is made of relatively soft material such as resin or rubber. A scale plate 17 is also installed between the valve handle 2 and the valve stem 3 of the primary ball valve. A bypass pipe 8 is branched out from the left valve seat of the primary ball valve 21 , and the other end of...

Embodiment 2

[0046] A water-saving irrigation method chooses drip irrigation technology, and the layout of the simulation system is as follows: Figure 9 , the pipe network system is composed of clear water tanks, water pumps, main pipes, branch pipes, ball valves, connectors and plots, etc., serial numbers 2-8 are series nodes, and serial numbers 9 and 11 are ball valves, which control planting plot 1 and planting plot respectively 2. The connection method of the main pipe and the branch pipe is the same as that of the first embodiment. The clean water pool is pressurized to a water head of 5m by a water pump, and the elevation of the pipe and the elevation of the planting area are both 0. The water delivery pipe is made of PVC material, the wave velocity is 437m / s, the pipe diameter is DN100, the flow velocity is 2m / s, the pipe pressure standard is 0.8Mpa, the system is divided into 11 sections, and the total length is 110m. The closing law of the ball valve ( T c =2s). The calculat...

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Abstract

The invention discloses a ball valve system for agricultural irrigation throttling and pipe water hammer protection and a control method thereof. The system comprises a first-stage ball valve and a second-stage ball valve which are connected in series, a main flowing hole and a throttling hole cut through the main flowing hole are formed in a valve element of the first-stage ball valve, and the first-stage ball valve is connected with a pressure release valve body through a bypass pipe in parallel. The control method includes the steps that part of water flow passes through the first-stage ball valve, the other part of the water flow enters the pressure release valve body through the bypass pipe, a stopping block is pushed through the water flow to move back and forth, and the water hammer pressure generated by valve closing is weakened depending on stretchable changes of a spring in the valve body. By means of the ball valve system, rising of the water hammer pressure can be effectively reduced, damage of pipe net water hammers to the pipe system safety is accordingly eliminated, and the ball valve system has the functions of throttling and water hammer eliminating.

Description

technical field [0001] The invention relates to the technical field of agricultural irrigation and pressure pipelines, in particular to a control method for a ball valve system used for throttling agricultural irrigation and protecting pipeline water hammer and a control method thereof. Background technique [0002] At present, the water transmission and distribution pipe network in the water-saving irrigation system generally adopts plastic pipes such as PVC and PE. The pressure bearing capacity of such pipes is generally lower than that of steel pipes. Reduced capacity. In the operation and management of the pipeline network, due to the sudden start or stop of the pump and the sudden opening and closing of the valve feed water plug, it often leads to the occurrence of water hammer in the pipeline network. Water hammer is also called water hammer. It is an unsteady flow of fluid. In the pressure pipe flow, the momentum conversion is caused by the change of flow velocity, t...

Claims

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Application Information

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IPC IPC(8): F16K5/06F16K47/04F16K37/00
CPCF16K5/06F16K37/0075F16K47/02
Inventor 弋鹏飞张健俞晓东赵修龙陈胜黎东洲
Owner HOHAI UNIV
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