|150LB||1.- CLASS 150|
2.- Valve design: API 600 / ASME B16.34
3.- Body: Carbon steel: ASTM A216-WCB
4.- Bonnete: ASTM A216-WCB
5.- Gate: A216-WCM carbon steel / 13% carbon
6.- Seat: Forged Steel ASTM A-105 / Estellita (Coated)
7.- Stem: ASTM A182
8.- Rear seat: A276-420
9.- Gasket: A.276-420 STEEL VALVE TYPE BRIDGE TYPE CLASS 150
The purpose of a sight glass is to allow plant managers and engineers to look inside of their systems without disrupting the environment within. Often referred to as viewing glasses, they offer you a way to see the levels of liquids or gases that are traveling through a critical point of your design, monitor pressure changes, and virtually anything else that sight glass windows could allow you to do. With their widespread use, sight glasses have become critical to operations such as steam pipelines, chemical processing, pharmaceutical processing, and food processing.
The pipeline sight glass is one of the main accessories on the industrial pipeline device. It can observe the flow reaction of gas, liquid, steam and other media in the pipe at any time, monitor the production, and avoid accidents in the production process. Often used in chemical, chemical fiber, petroleum, pharmaceutical and other production pipelines
Repair and maintenance of pipe mirror
- The Sight Glass is used to observe the flow of gas, liquid, steam and other media reaction equipment, its window glass should be kept clean without dust;
- The Sight Glass of the mirror belongs to the appropriate damaged part, which should be handled with care when installing the mirror;
- There are some limitations in the temperature and pressure resistance of Sight Glass
- Shell material: Carbon steel or stainless steel WCB/304/316
- Size: 1/2″~24″
- Working Pressure: 150~300LB, 10~20K,PN16-PN2
- Connection: Flanged,Threaded End
- Structure: Swing Type
We delivered high quality, F51 Forged Globe Valve to one of brazil customers.
Name: Globe Valve.
Material: Forged Duplex Stainless Steel ASTM A182-F51.
Pressure: Class 1500.
Port: Reduced Port.
Connection: Flange End.
Class 150 ANSI B16.5 WN RF Welding Neck Flange
Stainless steel:ASTM A182 F304, F316L, F321, etc
Duplex steel:S31803, S32205, S32750, etc
150LB, 300LB, 600LB, 900LB, 1500LB, 2500LB
ASME, ANSI, JIS, DIN, etc
Butt welded or threaded
Slip-on, Lap joint, Welding neck, Socket welding, Threaded, Blind.
The flanges are used for the connection of tubes that transport water, oil, gas, etc
We are the china manufacture for producing not only duplex and super duplex steel F51/2205/S31803,
F53/2507/S32750/S32760, but also stainless steel materials (SS304/L, SS316/L, SS321),
specially Austenite stainless 310S, 347H, 317L, 904L etc.STV Valve will be your reliable choice.
For stainless steel gate valves, the valve is disconnected from the valve stem and the spool due to corrosion, wear or improper operation during opening and closing. After the valve is closed, it cannot be opened. It can only be replaced after it is cut out from the system. If it cannot be cut out from the system, only another process or device will be shut down.
When the stainless steel gate valve spool is detached and cannot be cut out, the valve cover, the valve stem, the bushing and the packing can be changed without changing the valve body, the valve core and the valve seat while the sealed medium is sealed. After the gland is assembled, the valve core is exposed, and the valve stem is reconnected to the valve core by a conventional method, so that the three seals of the valve can be continuously maintained and the valve can be reopened. After the valve cover of the stainless steel gate valve is disassembled, except for the special valve, the wedge angle of the valve spool is in the friction angle range. No matter how the pressure on both ends of the valve core changes, the valve core will not be squeezed out from the valve seat under the self-locking condition. For flat valve spools, there is no more extrusion.
There are many kinds of stainless steel ball valves, each of which has different uses. When choosing ball valves, we should know what kind of Ball Valves we need. Ball valve is essential, and there will be some leakage problems such as failure. Today I will tell you the reasons for the leakage of ball valve.
Causes of internal leakage
1. The casting quality of iron castings is not high, and there are sand holes, loose structures, slag inclusions and other defects on the valve body and bonnet body.
2. The bolt is loose due to thermal shock, and the pre tightening force of the bolt is not good. Or the nonuniformity of bolt is higher than that of flange.
3. The contact between gasket and flange becomes weak due to aging failure or mechanical vibration. Touch surface with low precision (with grooves, ridges, etc.) and medium
4. Poor welding, slag inclusion, no welding, stress crack and other defects
5. The cast iron valve is damaged after being hit by heavy objects.
External leakage cause
1. The packing is not selected correctly, is not resistant to medium corrosion, and is not resistant to the use of high pressure or vacuum, high temperature or low temperature of the valve.
2. The filler has aged and lost elasticity after the service life.
3. The number of packing rings is insufficient, and the gland is not pressed tightly.
4. The gland is skewed, and the gap between the gland and the valve rod is too small or too large, which causes the valve rod to wear.
5. Improper operation and excessive force
Everyone knows that there are many types of ball valves, including this butterfly valve. Then the well-known difference between a ball valve and a butterfly valve is its opening and closing member. The opening and closing member of the butterfly valve is a block plate, and the ball valve is a ball. They all rotate around one axis of their own. Let’s continue to see what is the difference between a butterfly valve and a ball valve.
Comparison between butterfly valve and ball valve
Advantages of butterfly valve 1: simple structure, small volume and light weight; disadvantages are that the range of using pressure and working temperature is much smaller than that of ball valve
Advantages of butterfly valve 2: good sealing can be realized under low pressure; the disadvantage is that the sealing performance is much worse than that of ball valve
Advantages of butterfly valve 3: it can transport mud with the least liquid accumulated in the pipe mouth, which is better than the ball valve
Advantages of butterfly valve 4: the structural principle of butterfly valve is more suitable for making large-diameter valve, widely used in oil, gas, chemical industry and other industries
The cut-off method of ball valve and butterfly valve is different: the ball valve blocks the passage through the ball to realize the pipe cut-off flow; the butterfly valve relies on the butterfly wing, so the pipe will not flow if it is spread and sealed.
The structure of the ball valve is different from that of the butterfly valve: the ball valve is composed of the valve body, valve core and valve rod assembly, and the body can only see some parts; the butterfly valve is composed of the valve body, valve seat, valve plate and valve rod, and all the accessories are exposed outside. Therefore, the tightness of butterfly valve is not as good as that of ball valve. When it comes to sealing, butterfly valves are also divided into soft sealing and hard sealing. Butterfly valve structure is relatively simple, can only be used in low-pressure environment, the highest pressure is only 64 kg. Compared with the ball valve, the maximum ball valve can reach about 100 kg.
The working principle of the ball valve and butterfly valve is different: the ball valve has a 90 degree rotation action, only because its opening and closing parts are a ball, only need to operate 90 degree rotation to achieve opening or closing, which is most suitable for switching. But now v-ball valve can be used to regulate or control the flow. Butterfly valve is a kind of valve that uses disc type opening and closing parts to turn back and forth about 90 ° to open, close or regulate medium flow. It has a good function of regulating flow and is one of the fastest-growing valve varieties.
Hard-sealed ball valves are also a type of wear-resistant ball valves. Today we will talk about the calculation of the torque of hard-sealed ball valves. The torque of the hard-sealed ball valve is also smaller than that of a soft seal such as F4 (fluoroplastic). Generally, the torque of a metal hard-sealed ball valve is more than twice that of a soft seal. And if it is designed or used improperly, it will be stuck. The advantage of a hard-sealed ball valve over a soft-sealed ball valve is that it can be used at high temperatures or where wear is required.
The pressure hard seal ball valve is under load. The higher the pressure, the larger the load and the more laborious the operation, that is, the greater the operating torque. Factors affecting the torque of the hard-sealed ball valve are the pressure (load), the friction of the moving pair, the packing friction of the bonnet stuffing box, the machining accuracy of the rotating parts, the degree of lubrication, the pre-tightening force of the threaded joint, and the valve stem. Deformation, because the frictional force of the partial area between the valve stem and the cover rises linearly, the operating torque will increase sharply, and even the valve stem can not move directly. If the pneumatic actuator and the electric actuator do not have measures to deal with the fault, it is easy to cause Pneumatic actuators and electric actuators are damaged.
The torque calculation of the valve is specifically: the square of the valve diameter of the one-half of the valve is 3.14, which is the area of the valve plate, and multiplied by the pressure (ie the working pressure of the valve) to obtain the static pressure of the shaft, multiplied by the friction coefficient. (To check the table, the friction coefficient of general steel is 0.1, the friction coefficient of steel to rubber is 0.15), multiplied by the shaft diameter divided by 1000 to obtain the torque of the valve, the unit is cattle·meter. STV valve engineers recommend that the driving torque of the floating ball valve and the fixed ball valve drive device is at least 1.3 times the operating torque of the valve. The operating torque of the metal hard seal floating ball valve is about 4 times that of the soft seal floating ball valve. The metal hard seal is fixed. The operating torque of the ball valve is approximately 3-4 times the operating torque of the soft seal fixed ball valve.
The forged steel check valve is a pressure self-tightening valve cover. The valve designed according to this design form has a valve body and a valve cover which are screwed, and the internal pressure is sealed by a self-sealing ring. The optional sealing discs are available in swing type, lift type, and ball type. The connection standard can be American or GB threaded, welded and flanged.