Types of Environmental Protection Valves Types of Environmental Protection Electric Valves Types of Environmental Protection Pneumatic Valves Types of Environmental Protection Manual Valves Types of Environmental Protection

The types of environmental protection valves are control components in pipeline fluid transportation systems. They are used to change the cross-sectional area of the passage and the direction of medium flow, and have functions such as diversion, cutoff, regulation, throttling, check, diversion, or overflow pressure relief. With the rapid development of urbanization in our country, environmental pollution problems have become increasingly prominent in areas such as "haze weather", "garbage encirclement", and circular economy around resource regeneration. We attach great importance to these issues and have jointly issued a document by 16 ministries. We have briefly listed several measures taken by the government in recent years to address environmental protection. During the 12th Five Year Plan period, China will implement a series of corresponding plans in the fields of environmental protection and waste management, which will provide ample opportunities for strengthening the construction and management of urban solid waste treatment and disposal facilities.

At the 18th Congress of the CPC, the concept of "ecological civilization, beautiful China, strict economy and environmental protection" was put forward, which means significant business opportunities for the domestic waste treatment industry.

To achieve sustainable and healthy economic and social development, the Party's report proposes to "build an ecological civilization, strive to build a beautiful China, and achieve sustainable development of the Chinese nation". The country places ecological civilization construction in a more prominent position, incorporates ecological benefits into the economic and social development evaluation system, and focuses on promoting green development, circular development, and low-carbon development. Valves used for fluid control range from simple globe valves to various valves used in extremely complex self-control systems, with a wide variety of varieties and specifications. The nominal diameter of valves ranges from extremely small instrument valves to industrial pipeline valves with a diameter of up to 10m. Valves can be used to control the flow of various types of fluids such as water, steam, oil, gas, mud, various corrosive media, liquid metals, and radioactive fluids. The working pressure of valves can range from 1.3 x 10MPa to ultra-high pressure of 1000MPa, and the working temperature ranges from ultra-low temperature of -269 ℃ to high temperature of 1430 ℃. The control of valves can adopt various transmission methods, such as manual, electric, hydraulic, pneumatic, worm gear, electromagnetic, electromagnetic hydraulic, electric hydraulic, pneumatic, spur gear, bevel gear drive, etc; Under the action of pressure, temperature or other forms of sensing signals, the valve can act according to predetermined requirements, or perform simple opening or closing without relying on sensing signals. The valve relies on driving or automatic mechanisms to make the opening and closing parts move up, down, slide, swing or rotate, thereby changing the size of its flow channel area to achieve its control function.

ITypes of environmental protection valves for governanceThe purpose of valves

A valve is a type of pipeline accessory that is used to change the cross-section of a passage and the direction of medium flow, and to control the movement of the conveyed medium. It has functions such as diversion, cutoff, regulation, throttling, check, diversion, or overflow pressure relief. Specifically, valves have the following uses:

1.1 Cut off valves: Connect or cut off the medium in each section of the pipeline. Such as gate valves, globe valves, ball valves, plug valves, diaphragm valves, butterfly valves, etc.

1.2 Regulating valves: regulating the flow and pressure of the medium in the pipeline. Such as throttle valves, regulating valves, pressure reducing valves, safety valves, etc.

1.3 Diverter valves: used to change the flow direction of media in pipelines, for distributing, separating, or mixing media. Such as distribution valves, three-way plug valves, three-way or four-way ball valves, drain valves, etc.

II Classification of Valves

There are many types of valves, and with the continuous improvement of the process flow and performance of various complete sets of equipment, the types of valves are still increasing. However, in general, they can be divided into two categories:

2.1 Automatic Valve

A valve that operates on its own by relying on the ability of the medium (liquid, gas, steam, etc.). Such as safety valves, check valves, pressure reducing valves, drain valves, hydraulic control valves, emergency shut-off valves, exhaust valves, etc.

2.2 Valve Drive

Valves operated by manual, electric, hydraulic, and pneumatic means. Such as gate valves, globe valves, throttle valves, butterfly valves, ball valves, balance valves, plunger valves, plug valves, etc.

Valves rely on automatic or driving mechanisms to lift, slide, swing, or rotate their opening and closing components, thereby changing the size of their flow area to achieve their control functions.

In addition, there are several classification methods for valves.

2.3 Classified by structural features

According to the direction of movement of the closing member relative to the valve seat, it can be divided into:

2.3.1 Cut off valve shape: The closing and opening member moves along the centerline of the valve seat.

2.3.2 Gate shape: The closing and opening components move in a direction perpendicular to the centerline of the valve seat.

2.3.3 Plug and ball: The opening and closing components are plungers or balls that rotate around their own axis.

2.3.4 Rotary opening shape: The opening and closing member rotates around the axis outside the valve seat.

2.3.5 Butterfly: A disc of an opening and closing member that rotates around the axis inside the valve (midline type) or around the axis outside the valve seat (eccentric type)

2.3.6 Sliding valve shape: The opening and closing components slide upward in the direction perpendicular to the channel.

2.4 Classified by manipulation method: According to different manipulation methods, it can be divided into:

2.4.1 Manual valves - using handwheels, handles, wrenches, levers, or sprockets, etc. Valves operated by human labor can be equipped with reduction devices such as worm gears and gears when a large torque needs to be transmitted.

2.4.2 Electric valve - a valve operated by an electric motor, electromagnetic or other electrical means.

2.4.3 Hydraulic or Pneumatic Valves - Valves operated by liquids (such as water, oil, etc.) or gases.

2.4.4 Automatic valve - a valve that operates on its own by relying on the ability of the medium (liquid, gas, steam) itself.

IIIClassified by main parameters

3.1 Divided by pressure:

3.1.1 Vacuum valve - a valve with a working pressure lower than standard atmospheric pressure, a valve with a pressure less than 0.1 MPa (i.e. 760 mm Hg), usually expressed in millimeters of water column (mmH2O) or millimeters of mercury (mmHg).

3.1.2 Low pressure valves - valves with nominal pressure PN ≤ 1.6MPa.

3.1.3 Medium pressure valve - a valve with a nominal pressure of PN2.5~6.4MPa (25~64kg).

3.1.4 High pressure valve - a valve with a nominal pressure of PN10.0~80.0MPa (100~800kg).

3.1.5 Ultra high pressure valves - valves with a nominal pressure of ≥ 100MPa (1000-10000kg).

3.2 Classified by working temperature of the medium:

3.2.1 Normal temperature valve - valves with a temperature range of 40 ℃ ≤ t ≤ 120 ℃.

3.2.2 Medium Temperature Valve - Valves with a temperature range of 120 ℃ ≤ t ≤ 450 ℃.

3.2.3 High temperature valves - valves with t>450 ℃.

3.2.4 Bottom temperature valve - a valve with a temperature range of 100 ℃ ≤ t ≤ -40 ℃.

3.2.5 Ultra low temperature valve - valves with t<-100 ℃.

3.3 Classification by valve body material:

Valve body material

Non metallic materials, ceramics, fiberglass, plastics

Metallic materials: Hastelloy, zirconium and zirconium alloys, nickel and nickel alloys, titanium and titanium alloys, Monel alloys

Cast Iron Carbon Steel Low Alloy Steel High Alloy Steel

3.4 Classification by valve body lining material:

Valve body lining material

Metal Material Copper Alloy Steel Hard Alloy

Non metallic materials, rubber lining, fluoroplastic, nylon rubber

3.5 Classified by nominal diameter:

3.5.1 Small Diameter Valves - Valves with a nominal diameter of DN<40mm.

3.5.2 Medium caliber valves - valves with a nominal diameter of DN50~30mm.

3.5.3 Large Diameter Valves - Valves with a nominal diameter of DN350~1200mm.

3.5.4 Extra Large Diameter Valves - Valves with a nominal diameter of DN>120mm.

3.6 Classified by the method of connection with the pipeline:

3.6.1 Threaded Connection Valve - The valve body has internal or external threads and is connected to the pipeline using threads.

3.6.2 Flange connected valve - The valve body is equipped with a flange and connected to the pipeline using a flange.

3.6.3 Welded Connection Valve - The valve body has a weld joint and is welded to the pipeline.

3.6.4 Clamp connection valve - Use double headed bolts to connect the valve between the flanges on the pipeline.

3.6.5 Clamp Connection Valve - The valve body has a clamp pattern and is connected to the pipeline using clamps.

3.6.6 Card sleeve connection valve - Use a card sleeve to connect with the pipeline.

IVGeneral Classification of Valves

This classification method is currently used in China, which divides based on principles, functions, and structures. With the rapid development of urbanization in our country, environmental pollution problems have become increasingly prominent in areas such as "haze weather", "garbage encirclement", and circular economy around resource regeneration. We attach great importance to these issues and have jointly issued a document by 16 ministries. We have briefly listed several measures taken by the government in recent years to address environmental protection:

·During the 12th Five Year Plan period, China will implement a series of corresponding plans in the fields of environmental protection and waste management, which will provide ample opportunities for China to strengthen the construction and management of urban solid waste treatment and disposal facilities.

At the 18th Congress of the CPC, the concept of "ecological civilization, beautiful China, strict economy and environmental protection" was put forward, which means significant business opportunities for the domestic waste treatment industry.

To achieve sustainable and healthy economic and social development, the Party's report proposes to "build an ecological civilization, strive to build a beautiful China, and achieve sustainable development of the Chinese nation". The country places ecological civilization construction in a more prominent position, incorporates ecological benefits into the economic and social development evaluation system, and focuses on promoting green development, circular development, and low-carbon development. The State Council's Opinion on Accelerating the Development of Energy Conservation and Environmental Protection Industry (No. 30, 2013) states that the annual growth rate of the output value of energy conservation and environmental protection industry will be over 15%, and the total output value will reach 4.5 trillion yuan, becoming a new pillar industry of the national economy.

Proposal: To build an ecological civilization, it is necessary to establish a systematic and complete ecological civilization institutional system, and use the system to protect the ecological environment. We need to improve the property rights system and use control system of natural resource assets, delineate ecological protection red lines, implement the system of compensated use of resources and ecological compensation, and reform the management system of ecological environment protection.

Generally divided into: gate valve, globe valve, throttle valve, pressure reducing valve, ball valve, butterfly valve, safety valve, check valve and bottom valve, diaphragm valve, drain valve, drain valve, plunger valve, regulating valve.