Valve fittings and valves open and close the channel shape of the valve has a certain flow characteristics. In selecting valve, you must take this into account.
1. Cut off media access and use the valve
Often choose a smaller flow resistance, the channel for the straight-through valve. Such valves are gate valve, globe valve, plunger valve. Valve closed down, due to channel twists and turns, the high flow resistance than other valves, solid little choice. However, in allowing a higher flow resistance of the settings, they may choose closed-type valve.
2. Control the flow valve used in
Is usually easy to regulate flow of the election off valves, such as the control valve, throttle valve, plunger valve, the valve seat because of its size and hoist parts trips proportional relationship between the Cheng Wang. Rotary (eg, plug valves, ball valve, butterfly valve) and the wedge body style song (clip tube valves, diaphragm) can also be used for throttle valve control, but usually only in a limited range of the valve diameter to apply. In most cases, people often change the shape of cut-off valve made after throttling valve flap to use. Should be noted that by changing the valve opening or closing valves to achieve a high degree of cutting role is extremely unreasonable, because the pipeline throttling state media in a high velocity, sealing face susceptible to erosion, wear and tear, loss of cut, seal effect. Similarly, using the throttle as the cut-off device is unreasonable.
3. Commutated shunt with valve
According to the need for the diversion, this valve may have three or more channels, appropriate selection of plug valves and ball valves. Most of the change to the shunt valve used in such valves are optional. In some cases, other types of valves with only two or more properly connected with each other, but also can be used for the streaming media.
4. With suspended particles in the medium used in the valve
If the media with suspended particles, the most appropriate use of its open and close the sliding pieces along the sealing surface of the valve with a wipe effect, such as the flat valve.
ball valve Trunnion Mounted Ball Valve Floating Ball Valve Top Entry Ball Valve ball valve V Type Ball Valve
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Saturday, March 5, 2011
Corrosive media, operating conditions, how to choose chemical valve
In the corrosive medium operating conditions of valves, anti-corrosion chemical equipment is the most critical areas, if not the correct choice of chemical industry valve metal materials, a little carelessly, ranging from damage to equipment, while in causing the accident or even lead to disaster . According to relevant statistics, chemical equipment, about 60% of the damage caused due to corrosion, so the selection of equipment in the chemical industry should pay attention to when the first selection of the scientific. Usually there is a misunderstanding that the stainless steel is "Universal", no matter what the media and environmental conditions Pengchu stainless steel, this is not true, and it is very dangerous. The following media to talk about for some commonly used chemical selection points:
1. Sulfuric acid medium, as one of the strong corrosive medium, sulfuric acid is to use a very wide range of important industrial raw materials. Different concentrations and temperature of the sulfuric acid corrosion of materials vary greatly, for more than 80% concentration, the temperature is less than 80 ℃ in concentrated sulfuric acid, carbon steel and cast iron has good corrosion resistance, but it is not suitable for high-speed flow of sulfuric acid , not used as a valve material; ordinary stainless steel, such as 304 (0Cr18Ni9), 316 (0Cr18Ni12Mo2Ti) is also limited use of sulfuric acid. Therefore, transport of sulfuric acid pump and valve are usually high-silicon cast iron (casting and machining difficult), high alloy stainless steel (alloy No. 20) manufacturing. Fluorine plastic has good resistance to sulfuric acid properties, using fluorine Valve (F46) is a more economical choice. If the pressure is too large, temperature, plastic valve with the points on a hit, you can choose more expensive than it has a ceramic ball valve.
2. Hydrochloric Acid must have patience to sit through most of the hydrochloric acid corrosion of metallic materials (including a variety of stainless steel material), containing molybdenum is also only be used for high-Si-Fe 50 ℃, 30% hydrochloric acid below. And metal materials, the contrary, the vast majority of non-metallic materials have good corrosion resistance, hydrochloric acid, so rubber lined pumps and plastic pumps (such as polypropylene, fluorine plastic, etc.) is the best choice for conveying hydrochloric acid. But this kind of medium, if the temperature exceeds 150 ℃, or the pressure is more than 16 kilograms, any plastic (including polypropylene, fluorine plastic or even PTFE) will not be competent, while not currently on the market have very good the valve, but you can try now emerging ceramic ball valve, this valve has the advantage of self-lubrication, torque force is small, non-aging, life span is much longer than the average over the valve, its disadvantage is that the price more higher than the plastic valve.
3. Nitric acid media, most of the general metal corrosion in nitric acid was rapidly destroyed, stainless steel is the most widely used nitric acid-resistant materials, all concentrations of nitric acid at room temperature have good corrosion resistance, it is worth mentioning that the molybdenum-containing stainless steel ( such as the 316,316 L) of nitric acid corrosion resistance is not only no better than ordinary stainless steel (eg 304,321), and sometimes even better. For high-temperature nitric acid, commonly used titanium and titanium alloy materials.
4. Acetic acid medium which is corrosive organic acid, one of the strongest material, ordinary iron and steel in all of the acetic acid concentration and temperature will be severe corrosion, stainless steel is an excellent acid-resistant materials, 316 stainless steel containing molybdenum can applicable to high temperature and dilute acetic acid vapor. For the high temperature and high concentrated acetic acid, or contain other corrosive media such as stringent requirements may make use of high alloy stainless steel or fluorine plastic pump.
5. Alkali (sodium hydroxide) steel is widely used in 80 ℃ below 30% within the concentration of sodium hydroxide solution, there are a number of petrochemical plants in 100 ℃, 75% is still below the ordinary iron and steel, although the corrosion increased, but the economyä½³. Ordinary alkali corrosion resistance of stainless steel for iron, compared with no obvious advantages, as long as the media were mixed to allow a small amount of iron, stainless steel is not recommended. For the high-temperature lye to use more titanium and titanium alloy or high alloy stainless steel.
6. Ammonia (ammonium hydroxide) Most of the metal and non-metal in liquid ammonia and ammonia (ammonium hydroxide) in the corrosion is very slight, only the copper and copper alloy unfit for use.
7. Chlorine (chlorine) Most of the chlorine in the corrosion resistance of metal valves are very limited, particularly in the case of chlorine with water, including various alloy valves, this case, the PTFE valve is a very good choice, but the production of chlor-alkali chemical plants will find: PTFE valve used for a long time for a little torque force increases, the problem of aging will be highlighted PTFE out, this case is fatal leak occurred in a . May consider using PTFE lined ceramic ball to replace the original core of common PTFE lined valves, the use of ceramic self-lubricating and corrosion resistance of PTFE will have perfect results.
8. Salt water (seawater) General steel in sodium chloride solution and sea water, salt water corrosion rate is not too high to be used in general coating protection; all kinds of stainless steel also has a very low uniform corrosion rate, but may be due to chloride ions caused partial corrosion, usually 316 stainless steel well.
9. Alcohols, ketones, esters, ethers common alcohol media are methanol, ethanol, ethylene glycol, propanol, etc., ketones media are acetone, methyl ethyl ketone, etc. A variety of esters of medium ester, ethyl ester, etc., ethers media are ether, ethyl ether, butyl ether, etc., they are basically no corrosive materials can be used to apply a specific use should also be under the relevant requirements of the medium properties and make a reasonable choice. Also noteworthy was the ketones, esters, ethers of a variety of rubber are soluble, the choice of sealing materials to avoid making mistakes.
There are many other media can not be introduced in this 11, in short, when you must not be arbitrary in the selection and blindness, should be more access to relevant information or learn from mature experience.
We can offer more Knife Gate Valve Information.If you need us according your spcification to produce the Knife Gate Valve .
Need, please e-mail to valve401@gmail.com i
1. Sulfuric acid medium, as one of the strong corrosive medium, sulfuric acid is to use a very wide range of important industrial raw materials. Different concentrations and temperature of the sulfuric acid corrosion of materials vary greatly, for more than 80% concentration, the temperature is less than 80 ℃ in concentrated sulfuric acid, carbon steel and cast iron has good corrosion resistance, but it is not suitable for high-speed flow of sulfuric acid , not used as a valve material; ordinary stainless steel, such as 304 (0Cr18Ni9), 316 (0Cr18Ni12Mo2Ti) is also limited use of sulfuric acid. Therefore, transport of sulfuric acid pump and valve are usually high-silicon cast iron (casting and machining difficult), high alloy stainless steel (alloy No. 20) manufacturing. Fluorine plastic has good resistance to sulfuric acid properties, using fluorine Valve (F46) is a more economical choice. If the pressure is too large, temperature, plastic valve with the points on a hit, you can choose more expensive than it has a ceramic ball valve.
2. Hydrochloric Acid must have patience to sit through most of the hydrochloric acid corrosion of metallic materials (including a variety of stainless steel material), containing molybdenum is also only be used for high-Si-Fe 50 ℃, 30% hydrochloric acid below. And metal materials, the contrary, the vast majority of non-metallic materials have good corrosion resistance, hydrochloric acid, so rubber lined pumps and plastic pumps (such as polypropylene, fluorine plastic, etc.) is the best choice for conveying hydrochloric acid. But this kind of medium, if the temperature exceeds 150 ℃, or the pressure is more than 16 kilograms, any plastic (including polypropylene, fluorine plastic or even PTFE) will not be competent, while not currently on the market have very good the valve, but you can try now emerging ceramic ball valve, this valve has the advantage of self-lubrication, torque force is small, non-aging, life span is much longer than the average over the valve, its disadvantage is that the price more higher than the plastic valve.
3. Nitric acid media, most of the general metal corrosion in nitric acid was rapidly destroyed, stainless steel is the most widely used nitric acid-resistant materials, all concentrations of nitric acid at room temperature have good corrosion resistance, it is worth mentioning that the molybdenum-containing stainless steel ( such as the 316,316 L) of nitric acid corrosion resistance is not only no better than ordinary stainless steel (eg 304,321), and sometimes even better. For high-temperature nitric acid, commonly used titanium and titanium alloy materials.
4. Acetic acid medium which is corrosive organic acid, one of the strongest material, ordinary iron and steel in all of the acetic acid concentration and temperature will be severe corrosion, stainless steel is an excellent acid-resistant materials, 316 stainless steel containing molybdenum can applicable to high temperature and dilute acetic acid vapor. For the high temperature and high concentrated acetic acid, or contain other corrosive media such as stringent requirements may make use of high alloy stainless steel or fluorine plastic pump.
5. Alkali (sodium hydroxide) steel is widely used in 80 ℃ below 30% within the concentration of sodium hydroxide solution, there are a number of petrochemical plants in 100 ℃, 75% is still below the ordinary iron and steel, although the corrosion increased, but the economyä½³. Ordinary alkali corrosion resistance of stainless steel for iron, compared with no obvious advantages, as long as the media were mixed to allow a small amount of iron, stainless steel is not recommended. For the high-temperature lye to use more titanium and titanium alloy or high alloy stainless steel.
6. Ammonia (ammonium hydroxide) Most of the metal and non-metal in liquid ammonia and ammonia (ammonium hydroxide) in the corrosion is very slight, only the copper and copper alloy unfit for use.
7. Chlorine (chlorine) Most of the chlorine in the corrosion resistance of metal valves are very limited, particularly in the case of chlorine with water, including various alloy valves, this case, the PTFE valve is a very good choice, but the production of chlor-alkali chemical plants will find: PTFE valve used for a long time for a little torque force increases, the problem of aging will be highlighted PTFE out, this case is fatal leak occurred in a . May consider using PTFE lined ceramic ball to replace the original core of common PTFE lined valves, the use of ceramic self-lubricating and corrosion resistance of PTFE will have perfect results.
8. Salt water (seawater) General steel in sodium chloride solution and sea water, salt water corrosion rate is not too high to be used in general coating protection; all kinds of stainless steel also has a very low uniform corrosion rate, but may be due to chloride ions caused partial corrosion, usually 316 stainless steel well.
9. Alcohols, ketones, esters, ethers common alcohol media are methanol, ethanol, ethylene glycol, propanol, etc., ketones media are acetone, methyl ethyl ketone, etc. A variety of esters of medium ester, ethyl ester, etc., ethers media are ether, ethyl ether, butyl ether, etc., they are basically no corrosive materials can be used to apply a specific use should also be under the relevant requirements of the medium properties and make a reasonable choice. Also noteworthy was the ketones, esters, ethers of a variety of rubber are soluble, the choice of sealing materials to avoid making mistakes.
There are many other media can not be introduced in this 11, in short, when you must not be arbitrary in the selection and blindness, should be more access to relevant information or learn from mature experience.
We can offer more Knife Gate Valve Information.If you need us according your spcification to produce the Knife Gate Valve .
Need, please e-mail to valve401@gmail.com i
Sunday, January 2, 2011
Wafer Knife Gate Valve-007uk Valve supplier
Wafer Knife Gate Valve
Features:
1. Standard: API, DIN
2. Size Range: 2"-28"
3. Pressure: 150Lb-300Lb
4. Other features:
A) Handwheel torque or actuator force provides positive seat- knife closure
B) During closure, the stem slides down pushing the knife into contact with the two bottom lugs
C) The taper stem head then transfers a vertical closing force to a lateral force which positively seats the knife against the seat face
D) Stem force, not line pressure, maintains seating contact in this unique design, ensuring tight seating in both directions
E) During the opening and closing cycle, the guides ensure proper alignment of the knife
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Lug Type Knife Gate Valve-Valve manufacturers china
Lug type knife gate valve:
1)Standards:
A. Design&Manufacture: MSS SP-61
B. Face to Face: ANSI B16.10
C. Connection End: ANSI B16.5
D. Test: API 598
2)Sizes: 2" - 24" or DN50 - DN600
3)Pressure Rating: Class150 or PN6 - PN16
4)Material: WCB, WC6, WC9, C5, CF8, CF8M, CF3, CF3M, etc.
5)Operation: Manual, Gear, Pneumatic, hydraulic and Electric actuator
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Wednesday, December 29, 2010
Ansi Gate Valve-Valve manufacturers china
Ansi gate valve
Size: 2"-42"
Pressure: 150lb
Medium: Water, oil, gas
Material: Cast steel, stainless steel
T/T
Zhejiang Teyi Valve Co., Ltd.
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Need, please e-mail to valve401@gmail.com t
Electro-007uk Valve manufacturers
Product name: Electro-hydraulic knife-dege gate valve
Product type: PZ273H/Y type
Product pressure: Class150~600Lb
Product size: DN 15~600mm
Product group: Knife-dege gate valve. Pulp valve
Main External and Connection Dimension(mm)
MPa
DN
L
D1
D2
H
A
B
N-M
0.6
50
43
90
110
650
160
140
4-M12
65
46
110
130
670
160
140
4-M12
80
46
125
150
685
160
140
4-M16
100
52
145
170
755
200
160
4-M16
125
56
175
200
790
200
160
8-M16
150
56
200
225
865
200
160
8-M16
200
60
255
280
940
220
180
8-M16
250
68
310
335
1030
220
180
12-M16
300
78
362
395
1180
220
180
12-M20
350
78
412
445
1285
220
180
12-M20
400
102
462
495
1390
240
220
16-M20
450
114
518
550
1500
240
220
16-M20
500
127
568
600
1600
240
220
16-M20
1.0
50
43
100
125
650
160
140
4-M16
65
46
120
145
670
160
140
4-M16
80
46
135
160
685
160
140
4-M16
100
52
155
180
755
200
160
8-M16
125
56
185
210
790
200
160
8-M16
150
56
210
240
865
200
160
8-M20
200
60
265
295
940
220
180
8-M20
250
68
320
350
1030
220
180
12-M20
300
78
368
400
1180
220
180
12-M20
350
78
428
460
1285
220
180
16-M20
400
102
482
515
1390
240
220
16-M20
450
114
532
565
1500
240
220
20-M22
500
127
585
620
1600
240
220
20-M22
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Tuesday, December 28, 2010
Gate Valve (BW-007uk Valve supplier
Name: Brass gate valve
We produce all types of brass valves. Such as Brass Ball Valves, brass gate valve, brass stop valve, brass gas valve, brass angle valves, brass check valve, brass strainer etc
Brass ball valves, ball valves, brass valves, plumbing valves, water valves (Threaded ends)
Surface: Plated nickel or plated chrome or nature color.
Size: 1/2''-4''(DN15-DN100)
Material: C37700, MS58(CuZn40Pb2), CuZn39Pb3, CW602N C2121 CW614N
Connection thread: NPT, BSP, BSPT ( male and female is available)
Working Pressure: 16Bar-40Bar( 150#WSP, 600WOG)
Working Media: Water, Steam, Oil etc
2-piece body, full port or reduced port, chrome plated ball, metal-to-metal body seal, PTFE seat, brass spindle adjustable packing nut, steel or zinc-alloy handle. PVC handle cover.
We also do as clients' special requirements.
We can offer more Valve Technology Information.If you need us according your spcification to produce the Valve Technology .
Need, please e-mail to valve401@gmail.com
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