Valve basics

The valve is a control component in the pipeline fluid delivery system. It is used to change the passage section and the flow direction of the medium, and has the functions of diversion, cutoff, regulation, throttling, check, diversion or overflow relief.

Valves for fluid control, from the simple shut-off valves of Zui to the various valves used in extremely complex automatic control systems, the variety and specifications of the valves, the nominal diameter of the valve from the tiny instrument valve to the diameter of up to 10m Valves for industrial piping. The valve can be used to control the flow of various types of fluids such as water, steam, oil, gas, mud, various corrosive media, liquid metal and radioactive fluid. The working pressure of the valve can be from 1.3х10MPa to 1000MPa ultra-high pressure, working temperature From ultra-low temperature of -269 ° C to high temperature of 1430 ° C. The valve can be controlled by various transmission methods, such as manual, electric, hydraulic, pneumatic, worm gear, electromagnetic motion, electromagnetic-hydraulic, electric-hydraulic, gas-hydraulic, spur gear, bevel gear drive, etc. It can be operated under the action of pressure, temperature or other forms of sensing signals, according to predetermined requirements, or simply turned on or off without relying on the sensing signal. The valve relies on the drive or automatic mechanism to make the opening and closing parts lift and slide. Move, swivel or swivel motion to change the size of its flow path area to achieve its control function.

III Classification by main parameters

3.1 According to the pressure:

3.1.1 Vacuum valve - A valve with a working pressure lower than the standard atmospheric pressure. A valve with an absolute pressure less than 0.1 MPa (ie 760 mm Hg) is usually expressed in millimeters of water (mmH2O) or millimeters of mercury (mmHg).

3.1.2 Low pressure valve - a valve with a 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--valve (100~800kg) with nominal pressure PN10.0~80.0MPa.

3.1.5 Ultra-high pressure valve--valve with nominal pressure ≥100MPa (1000~10,000kg).

3.2 According to the working temperature of the medium:

3.2.1 Normal temperature valve --- 40 ° C ≤ t ≤ 120 ° C valve.

3.2.2 Medium temperature valve -- 120 ° C ≤ t ≤ 450 ° C valve.

3.2.3 High temperature valve -- t> 450 ° C valve.

3.2.4 bottom temperature valve --- 100 ° C ≤ t ≤ 40 ° C valve.

3.2.5 Ultra-low temperature valve - t <-100 °C valve.

3.3 Classified by valve body material:

Body material

Non-metallic materials ceramic glass steel plastic

Metal material copper alloy aluminum alloy lead alloy titanium alloy monel

Cast iron carbon steel low alloy steel high alloy steel

3.4 Classification by valve body lining material:

Body lining material

Metal material copper alloy alloy steel hard alloy fluoroplastic

Non-metallic materials rubber lining plastic fluoroplastic nylon rubber

3.5 According to the nominal diameter:

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

3.5.2 Medium Diameter 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 valve - valve with nominal diameter DN>120mm.

3.6 According to the way of connecting with the pipeline:

3.6.1 Threaded Valves - The body is internally or externally threaded and threaded to the pipe.

3.6.2 Flange Connection Valves - The valve body has a flange and is flanged to the pipe.

3.6.3 Welded connection valve - The valve body has a welded joint and is welded to the pipe.

3.6.4 Connecting the Valves to the Clips - Use a stud to connect the valve between the flanges on the pipe.

3.6.5 Clamp connection valve -- The valve body has a jaw pattern and is connected to the pipe by a clamp.

3.6.6 ferrule connection valve -- ferrule and pipe connection.

IV valve general classification

This classification method is divided according to principle, function and structure. It is the classification method used by domestic and international.

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, sewage valve , trap, plunger valve, regulating valve.

I Valve use

The valve is a pipe accessory, which is a device for changing the passage section and the flow direction of the medium to control the movement of the conveying medium, and has the functions of diversion, cutoff, adjustment, throttling, check, split or overflow relief. Features. Specifically, valves have several uses:

1.1 Cut-off valve type: Turn on 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: Adjust the flow and pressure of the medium in the pipeline. Such as throttle valves, regulating valves, safety valves, pressure reducing valves, etc.

1.3 Diverter valve class: Change the flow direction of the medium in the pipeline to distribute, separate or mix the medium. Such as distribution valve, three-way plug valve, three-way ball valve or four-way ball valve, steam trap and so on.

II Classification of valves

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

2.1 Automatic valve

A valve that acts on its own depending on its ability (liquid, gas, steam, etc.). Such as safety valves, check valves, pressure reducing valves, steam traps, hydraulic control valves, emergency shut-off valves, exhaust valves, etc.

2.2 drive valve

Valves operated by manual, electric, hydraulic and pneumatic. Such as gate valve, globe valve , throttle valve, butterfly valve, ball valve, balance valve , plunger valve, plug valve and so on.

The valve relies on an automatic or drive mechanism to cause the opening and closing member to move up, down, swing, or swivel to move, thereby changing the size of its flow passage area to achieve its control function.

In addition, the valve has the following classification methods.

2.3 by structural characteristics

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

2.3.1 Truncated: The closure moves along the centerline of the seat.

2.3.2 Gate shape: The closure member moves in a direction perpendicular to the centerline of the valve seat.

2.3.3 cock and ball: The opening and closing member is a plunger or a ball that rotates around its own axis.

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

2.3.5 Butterfly: The disc of the opening and closing member rotates around the axis of the valve (center line type) or the axis outside the valve seat (eccentric type)

2.3.6 Spool shape: The opening and closing member slides upward in the direction perpendicular to the passage.

2.4 According to the manipulation method: according to different manipulation methods can be divided into:

2.4.1 Manual valves - with the aid of handwheels, handles, wrenches, levers or sprockets. The valve operated by manpower can be equipped with a reduction gear such as a worm gear or a gear when a large torque needs to be transmitted.

2.4.2 Electric valves - valves that are operated by means of electric motors, electromagnetic or other electrical means.

2.4.3 Hydraulic or pneumatic valves - valves operated by means of liquids (liquid media such as water, oil, etc.) or gases.

2.4.4 Automatic Valves - Self-acting by the ability of the medium (liquid, gas, steam) itself

Made of valves.

Lycium sweet nature, Ping, owned by the liver and kidney, with nourishing liver and kidney, Liver eyesight effect, often with Rehmannia, chrysanthemum, yam, cornus and other drugs with the use. Modern medical research shows that it contains the carotene, betaine, vitamin A, vitamin B1, vitamin B2, vitamin C and calcium, phosphorus, iron, etc., with increased white blood cell activity and promote hepatocyte regeneration pharmacological effects of modern pharmacological experiments show that: Wolfberry has enhanced immune function, inhibition of tumor, lowering blood sugar, lipid-lowering, anti-fatigue and other functions. 

Please feel free to leave us message.
Any inquiry would be replied within 2 hours on working days!

 Production Specification Sheet

Natural Goji Juice

Goji Wolfberry Juice,Original Goji Juice,Wolfberry Juice,Natural Wolfberry Juice

Ningxia Wolfberry Goji Industry Co.,ltd , https://www.nx-wolfberry.com