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  • What is it?

A valve, called a valve, is a mechanical device used in piping systems to completely shut off the flow and to regulate (temperature, pressure, fluid flow, and fluid level) and safety. Placed.

Introducing the main components of valves

  • Body Valve

The body of the valve, in which the rest of the other components are placed and maintained, the end of the valve body in terms of flange connection, threaded and threaded and welded (Butt Welded Or Socket Welded) by casting and forging the body of one piece and Two pieces and three pieces are produced according to the size. It should be noted that the thickness and type of production depends on the working pressure and temperature.

  • Cap or Bonnet valve

The cap is assembled on the body by Bolted Bonnet, Welded Bonnet or Threaded Bonnet methods to prevent dust from entering and isolating the components inside the valve on the body. In a screw-and-thread method, a sealing washer is usually placed between the cover and the body, called the Bonnet Gasket.

  • Closure member (Closure member)

Conjugate to the object that prevents the passage of fluid and determine the passage of fluid through the embedded duct, the shape of the conjunctiva is due to the disc valves and hubs and cones and so on.

  • Trim valve

Trim is a set of parts that have a direct effect on sealing the valve. Trim material is selected from corrosion resistant materials because they have the most contact with the fluid. Disc, Seat, Stem, Bosch or Gland seal are the components of a set called trim.

  • Seat Lounge or Seat

The seat is used to seal around the experience (disc, wing, etc.) and sit the experience on it. The material of the seat should be selected correctly according to the fluid flow and experience due to the flow and pressure and working pressure and temperature. Seats are divided into two categories: Metal Seat and Soft Seat. The allowable temperature and leakage range per minute is specified in API598 standard.

  • Stem or stem stem

The interface between the connector and the actuator is said to transmit power from the actuator (lever and gearbox) even to the connector (disc and wing). It has a high strength and is usually made of steel with different grades by forging method. Is connected.

  • Yoke Valves

The interface between the body and the valve cover with the yoke operator is called the yoke material must have impact and pressure resistance.

  • Packing or sealing valve (Packing)

Packing between the stem and the lid is used to seal and prevent dust from entering the milk, sealing gaskets are used in other parts such as between the lid and the body, etc.

Valve division

  • Types of valves based on size

Valves are divided into two categories: metric system valves and inch system valves.

Inch system valves are usually based on working class (150, 300, 600, 900, 1500, 2500) PSI and pressure and temperature Pressure & temperature rating

According to ASME B16.34 standard. The nominal size of the valve in the inch system is called NPS.

Metric system valves (ISO, DIN, EN) are usually based on PN: pressure number (bar) and pressure and heat according to EN 1092-1: Pressure & temperature rating. The nominal size of valves in the metric system is called DN.

Types of valves in terms of operator

Manual Valve

Manual valves are valves whose required torque is less than 500 NM and are supplied by the operator with open and closed hand force. The operators of these valves are lever (butterfly valve), pulley (sliding valve), handle (gas valve). And in the size of 8 inches and above, most of the valve is supplied by the operator with a screw gear or screw gear actuator with an open and close force pulley.

  • Automatic or automatic valves (Actuators)

All valves that can be opened and closed without the need for an automatic operator or with an automatic plc command or remote control are called automatic valves, automatic mechanical valves (one-way valves, safety valves, etc.), valves with pneumatic actuator, valves With electric actuator, valves with hydraulic actuator, solenoid valves with electric spool form the division of automatic valves.

  • Automatic mechanical valve

Automatic mechanical valves pass or exit the fluid automatically or at a fluid pressure such as a one-way valve or in a calibrated adjustment range such as an automatic safety valve.

Pneumatic valve

Pneumatic valve consists of a valve with a pneumatic actuator. The valve opens and closes faster than other automatic valves due to wind pressure. Pneumatic valve models include pneumatic ball valve, pneumatic butterfly valve and pneumatic valve globe. Gradually disconnect and reconnect.

Valve with Electric Valve Actuator

The valve with electric actuator consists of valve components and electric actuator which is called MOV or Motor Operated Valve, which causes the valve to open and close by converting electrical energy into mechanical energy and transmitting force.

Valve with Hydraulic Actuators

Valve with hydraulic actuator consists of valve components with hydraulic actuator that works with oil fluid, hydraulic valve

This valve is used for mines or tunnels where there is a possibility of gas accumulation to prevent sparks and ignition.

Solenoid Valve

In designing the piping lines of Seat and Unseat points, more instantaneous force is used to open and close. he is doing it.

Types of valves in terms of mechanical movement

The linear valves (sliding valve, spherical valve) cut or connect the fluid path by moving it vertically or horizontally.

Conductor Rotary valves with 90 or 180 degree rotation Connector cut and connect the passage of fluid. Examples of these lions include ball valve and butterfly valve, etc.

Types of valves in terms of how the fluid passes

Shut-off valves are used only to open and close the fluid path, and this model of valves (sliding valve) can not be used to control the fluid due to turbulence (ram impact).

Flow control valves are used for both disconnection and connection and for flow control. These valves control fluid flow with operator or automatic.

Automatic mechanical valve

Valves such as valve stiffeners and pressure relief valves or one-way valves that pass, cut or reduce fluid either by adjusting the calibration of the valve or by pressing the valve.

Introducing different types of industrial milk

Gate Valve

The gate valve is called the sliding valve or gate valve. In the gate valve, linear valves are used to cut off and connect the fluid flow. Opening and closing the valve is most consumed in linear shut-off valves. Sliding valve in the open state creates the least pressure drop. The gate valve can not be used to control the fluid due to turbulence and lack of sealing in the semi-open state.

  • The benefits of gate valve

Full valve sealing when closing

Slight pressure drop

Easy operation

Easy maintenance

Lower price due to simple design and no need for advanced production equipment

Disadvantages of gate valve

No quick opening and closing in urgent cases (in operator mode)

Lack of fluid control

Vibration with fluid turbulence

Types of gate valves

Wedge Gate Valve

The wedge valve experience, as its name implies, is like a wedge. Wedge joints facilitate the sealing of the valve at high pressure. The design standard of this valve is API600, API602, API603 and BS EV ISO 10434 standard, and the designer must consider the API6D standard requirements for using the valve in piping lines.

Experience wedge milk

Wedge valve hinge with an angle of 3 to 5 degrees is a cylindrical cone, this type of hinge cone provides complete sealing between it and the seat.

Knife gate valve

Pharmaceutical valve is a knife of the oldest type of milk, which in ancient times was of the simple type as a seal valve in the water path. Knife valves suffer the least pressure drop because they are completely out of the fluid path. Knife milk For cases where the fluid has suspended particles or fibers such as algae, rope, etc. are present in the fluid, it is recommended to use knife milk. This valve is assembled with manual and pneumatic actuator and gearbox.

Globe Valve

Spherical valve, also called needle valve or plate valve, is used to disconnect and connect and control the flow. Mojraband This is a short cylindrical cone valve, the lower part of which has a seating angle, which completely seals by sitting on the set. Needle valves are produced in the model of 90-degree needle valve and 180-degree needle valve. They enter and exit with a 180 degree rotation. Globe valve is designed with API6D standard.

Types of spherical milk

Z type globe valve

The Z-shaped spherical valve is the most widely used type of spherical valve in which the fluid exits from the moment of entry to the exit with a 180 degree rotation. Due to the 180 degree rotation of the fluid, this valve may suffer more pressure drop.

Y pattern globe valve

Spherical Y-shaped valve with an angle of 45 degrees and the fluid exits from the inlet to the outlet with less rotation, which bears less pressure drop when the full valve is open.

90 degree spherical valve (angle type globe valve)

90 degree spherical valve where the inlet and outlet of the valve has a 90 degree angle. For cases where the path is 90 degrees or line transfer, a 90 degree spherical valve can be easily used.

Ball Valve

The ball valve is the most widely used valve in industrial and agricultural uses. The ball valve cuts and connects the fluid flow by rotating the wing 90 degrees. The ball valve can also be used to control the fluid, the design standard of the ball valve is API608 and BS EN ISO 17292.

Types of ball valves in terms of wings:

Full Bore Ball valve

Full boron ball valve in which the size of boron (hole diameter) is equal to the diameter of the line and the volume of fluid passing through and the outlet is almost the same.

Reduced Bore Ball Valve

In a radius ball valve, the boron burner (wing hole diameter) is one or two sizes smaller than the line size.

V Port Ball Valve

The boron of this ball valve is V-shaped and can be used to control the flow, which is also selected according to the percentage of the amount of fluid passing through the wing.

Types of ball valves in terms of ball control

Floating Ball Valve

The wing of the floating ball valve is connected from the wing to the stem and is placed between the two seats from the bottom, and with the entry of the wing fluid, it attaches to the seat and performs sealing.

Trunnion Ball Valve

The wing of the Trinion ball valve is connected to two stems from the top and bottom, and the wing is held between the fluid and the seat, and sealing is done.

Types of ball valves in terms of assembly

Ball Valve Top Entry

This model of ball valve is assembled from the top.

Ball Valve Side Entry

The valve wing of the ball is assembled from the armpit and then the flange is closed to the body with a bead.

Butterfly Valve

Butterfly valve is one of the most widely used industrial and agricultural valves due to its easy operation and cheap price. he does.

Types of butterfly valves in terms of connection type

Butterfly Valve Wafer Type

Wafer butterfly valve is the most widely used butterfly valve model due to its light weight and connection type. The wafer butterfly valve is connected to the flange through two holes at the top and two holes at the bottom. A wafer butterfly valve seat is the most susceptible point of a butterfly valve that needs to be replaced over time.

Butterfly Valve Lug Type

The butterfly log is in terms of body thickness and the number of holes between the wafer butterfly valve and the flanged butterfly valve.

Butterfly Valve Flange Type

Flanged butterfly valve has the largest width among butterfly valve models and the thickness of flanged butterfly valve is directly related to working pressure and its thickness is higher in higher classes.

Material of butterfly valve components

Butterfly valve body

Butterfly valve is made of cast iron, steel, steel, aluminum, bronze and duplex according to the temperature, type of fluid and working pressure of the body material.

Butterfly valve disc

The butterfly valve disc is made according to the type of fluid, working pressure and temperature in EPDM, PTFE, SS 304, SS 316, AL-B materials, which the disc can be cast either with a one-piece casting shaft or with a welding shaft. Be.

Butterfly milk seat

The butterfly valve set or the same liner is produced in EPDM, PTFE, SS 304, SS 316, AL-B materials. The material of the butterfly valve seat is selected according to the type of fluid, working pressure and temperature.

Repair valves

Repair processes of industrial valves

Among the capabilities of Kimia Tajhizkar, we can mention the maintenance of all types of valves (BALL VALVE, Gate valve, one-way check valve, Globe valve, butterfly valve, etc.), which in this regard and over the years. In the past, more than 13,000 valves have been repaired in this complex.

All repair operations are performed according to international standards (API, IPS, BS, ASME) etc. and based on technical specifications and performance methods.

Valve repair is done in two ways:

On-site repair: This method is mostly used in cases where the valves are welded and have fewer defects and there is no opportunity to transfer the valves to the workshop.

  • Repair in the factory: If there is a problem with the valve and the valve needs to be dismantled, it will be transferred to the factory in the following steps:
  1. Open the valve and disassemble the parts
  2. Perform cleaning of all valve surfaces
  3. Non-destructive tests such as radiography and penetrant testing of PT, VT, MT, etc.
  4. Perform testing and checking the movement of operators
  5. Testing of sealing components and execution of machining operations including grinding and polishing
  6. Replacement or manufacture of packing and o-rings and defective parts
  7. Depending on the type of valve and if necessary, apply special coatings such as (ENP, HNP) and so on
  8. According to the opinion of the employer and if necessary, the implementation of sandblasting and color
  9. Certification and milk testing
  10. packing

Manufacture of spare parts from size 2 "to 56"

The body of all valves is made according to the size by two methods of casting and forging.

Also, construction and repair of bonds, wings, plugs, shafts, nozzles, covers, liners, caterers, etc. are done in the factory.

Convert boiling valves to flange valves and flange valves to boiling valves from size 2 "to 56"

With the latest CNC machines, etc., also with the ability of its experts, it turns all valves from flange to weld and from weld to flange according to the opinion of the employer and according to the standard.

Perform testing and certification

After the repair, the valve is subjected to a hydro test to ensure that the valve is completely sealed according to the standard. According to the employer, the test is performed in the presence of the employer's inspectors.


To inquire about prices, please call 09121940732 (Arab Engineer) or leave a message on WhatsApp. You can also send your request to arab.sepahan@gmail.com.

Thanks 

Gohar Shimi Karan Pasargad
Gohar Shimi Karan Pasargad


 

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