How to solve the problem of water leakage or rust in the forged steel check valve

  1. Forging steel check valve storage environment should be noted, should be stored in a dry and ventilated room, and block both ends of the passage.
  2. The forged steel check valve should be inspected regularly, and the dirt on it should be removed, and the anti-rust oil should be applied on the surface.
  3. Forged steel check valves after installation should be regularly inspected to ensure their normal operation.
  4. Check the valve sealing surface for wear and repair or replace it according to the situation.
  5. Check the trapezoidal thread wear of the valve stem and stem nut of the forged steel stop valve, whether the packing is out of date, etc., and make necessary replacement.
  6. Test the sealing performance of the valve to ensure its performance.
  7. The valve in operation should be in good condition, the bolts on the flange and the bracket are complete, the thread is not damaged, and there is no looseness.
  8. If the handwheel is lost, it should be timely and not replaced by a spanner wrench.
  9. The packing gland is not allowed to be skewed or has no pre-tightening clearance.
  10. If the valve is used in a harsh environment and is susceptible to dirt such as rain, snow, dust, sand, etc., a protective cover should be installed for the valve stem.
  11. The scale on the forged steel stop valve should be complete, accurate and clear, and the valve seal and cap.
  12. The problem of depression and crack of the insulated forged steel stop valve.
  13. Forging steel check valve in operation, avoid knocking on it, or supporting heavy objects.

What is the principle of selection for forged steel globe valves?

The principle of selection for forged steel globe valves is:

  1. The globe valves should be used on the pipeline or device of high temperature and high pressure medium. Such as thermal power plants, nuclear power plants, high-temperature, high-pressure pipelines of petrochemical systems.
  2. On the pipeline where the flow resistance is not strict on the pipeline. That is, the place where the pressure loss is not considered.
  3. Small valves can be used with needle valves, instrument valves, sampling valves, pressure gauge valves, etc.

4, there are flow adjustment or pressure regulation, but the adjustment accuracy is not high, and the pipeline diameter is relatively small, such as the nominal diameter of ≤ 50mm pipeline, should be used.

  1. For small chemical fertilizers and large chemical fertilizers in synthetic industrial production, high-pressure angle shut-off valves or high-pressure angle throttle valves with nominal pressure PN160 nominal pressure 16MPa or PN320 nominal pressure 32MPa should be used.
  2. In the desiliconization workshop and the easy coking pipeline in the production of alumina Bayer method, it is easy to select the DC type
    globe valves valve or the DC type throttle valve with the valve body separated, the valve seat can be removed, and the carbide seal pair.
  3. In the water supply and heating projects in urban construction, it is known to pass through smaller pipelines, and the cut-off, balance valve or plunger valve can be used, such as the pipeline passing the nominal less than 150mm.

Forged steel globe valves valves pay attention to the problem of the valve in the switch position. The ball valve is normally in the open position during maintenance and maintenance. In special cases, the maintenance is turned off. Other valves cannot be discussed in terms of opening. Forged steel globe valves must be closed during maintenance to ensure that the grease fills the seal groove along the seal. If it is open, the seal grease will fall directly into the runner or valve cavity, causing waste. When the valve is greased, the problem of grease injection is often ignored. The pressure, grease injection amount and switch position are normal during the grease filling operation. However, in order to ensure the grease filling effect of the valve, it is sometimes necessary to open or close the valve to check the lubrication effect and confirm that the valve ball or the surface of the valve is evenly lubricated.

FORGED STEEL GATE VALVES SHIPPED To Customer

Today we finish this below order,many thanks for our customer’s support,we are looking forward to next cooperation.

What is the main purpose of stainless steel valves?

Stainless steel valves are valves made of stainless steel and have better performance. Let’s talk about its main purpose.

Stainless steel valves refer to gates made of stainless steel materials. Stainless steel valves use the industry: food biscuit industry, instant noodles and rice noodle industry, various frozen food dewatering line equipment, glass products industry.

Stainless steel valves are widely used in chemical, petrochemical, petroleum, paper, mining, electric power, liquefied petroleum gas, food, pharmaceutical, water supply and drainage, municipal, mechanical equipment, electronics industry, urban construction and other fields. 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 simplest shut-off valves to the valves used in extremely complex automatic control systems, come in a wide variety of sizes and sizes. Stainless steel valves 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 0.13MPa to 1000MPa. Temperature from -260 ° C ultra-low temperature to 1430 ° C high temperature

STV delivery Dual Plate Wafer Check Valve, ASTM B148 C95400, 18 IN CL300, API 594

3 Pcs Dual Plate Wafer Check Valve ready for delivery

On 11th April 2019,its the four working day of our company after the Ching Ming Festival,3 pcs of Dual Plate Wafer Check Valve, ASTM B148 C95400, 18 IN CL300, API 594 finsheed the painting and pakcing,Are ready for despatch.

Valve description:
Name: Dual Plate check valve, wafer type.
Design: API 594.
Body: ASTM B148 C95400.
Nominal size: 18 Inch.
Nominal class: Class 300 LB.
Connection ends: wafer type for connection between 2 flange, as per ASME B16.47B.
Face to face: as per ASME B16.10.
Test and inspection: API 598.

Technical parameters and characteristics

ProductDual-Plate check valve
Nominal diameterNPS 2” ~ 48”
Design temp. -196℃ ~ 593℃
Design pressureclass 150 ~ 1500
MaterialA216 WCB, WCC, A217 WC6, WC9, C5, C12A, A352 LCB, LCC,
A351 CF8, CF8M, CF3M, CF8C, CN3MN, CK3MCUN, CN7M,
A890 4A(CD3MN), 5A(CE3MN), 6A(CD3MWCuN), 
ASTM B 148 C95800, C95500,C95400
Design standardAPI 594, API 6D
Face to FaceASME B16.10
Connection endwafer, LUG, RF
Test standardAPI 598, ISO 5208
OperationNO
Applicationelectric power, petroleum refining, petrochemical engineering,
offshore oil, chemical engineering
Function 1With springs, material INCONEL X 750
Function 2Option: Metal seat: stainless steel、Stellite
Function 3Option: Soft seat: EPDM, NBR,VITON
Function 4outside of shaft as old-common design
inside of shaft as new design, without external leakage
Function 5Light weight & compact design

What is the function of the stainless steel check valve?

  1. The function of the check valve: prevent the medium from flowing backward, prevent the pump and the drive motor from reversing, and release the container medium.
  2. The check valve refers to a valve that automatically opens and closes the valve flap by means of the flow of the medium itself, and is used to prevent the back flow of the medium, also called a check valve, a check valve, a reverse flow valve, and a back pressure valve. The check valve is an automatic valve.
  3. The check valve is divided into three types according to the structure: the lift check valve, the swing check valve and the butterfly check valve:

Lift check valves are available in both vertical and horizontal versions.

The swing check valve is divided into three types: single-lobed, double-lobed, and multi-lobed.

The butterfly check valve is straight-through.

The above several check valves can be divided into four types: threaded connection, flanged connection, welded connection and clamped connection.

4, check valve installation (Check Valve) should pay attention to the following matters

A. Do not allow the check valve to bear weight in the pipeline. The large check valve should be independently supported so as not to be affected by the pressure generated by the piping system.

B. Pay attention to the direction of media flow when installing. It should be consistent with the direction of the arrow marked on the valve body.

C. The lift vertical flap check valve should be installed on the vertical pipe.

D. The lift horizontal flap check valve should be installed on the horizontal pipe.

Introduction to the classification of self-sealing forged steel valves

Today, let’s take a look at the classification of self-sealing forged steel valves.

 Forged steel valves can be classified into forged steel check valves, forged steel gate valves, forged steel ball valves, forged steel globe valves, forged steel check valves, self-sealing gate valves, self-sealing globe valves, self-sealing check valves, forged steel needles. Valve, forged steel insulation valve, forged steel bellows valve, etc.

  Forged steel gate valves often ignore pressure problems. In the grease injection operation, the grease-loaded regular semi-free float-type steam trap has a peak-to-valley change. The pressure is too low, the seal leaks or the safety valve fails, the pressure is too high, the grease port valve manufacturer is clogged, the seal grease hardens or the seal ring and the valve ball and the valve plate are locked. Usually, when the grease pressure is too low, the injected grease flows into the bottom of the valve cavity, which usually occurs in a small gate valve. The pressure of the grease flow control valve is too high. On the one hand, the grease valve is inspected and the grease nozzle is inspected. If the grease remote control float valve hole is blocked, the spring seal is replaced with a wrench. The other plunger valve is a lipid. For hardening, use a cleaning solution, repeatedly soften the failed sealing grease, and inject a new grease to replace it. In addition, the sealing type and sealing material also affect the grease filling pressure. Different sealing forms have different grease filling pressures. Generally, the hard sealing grease pressure is higher than the soft sealing.

 Forged steel globe valves pay attention to the problem of the valve in the switch position. The ball valve is normally in the open position during maintenance and maintenance. In special cases, the maintenance is turned off. Other valves cannot be discussed in terms of opening. Forged steel shut-off valves must be closed during maintenance to ensure that the grease fills the seal groove along the seal. If it is open, the seal grease will fall directly into the runner or valve cavity, resulting in waste. When the valve is greased, the problem of grease injection is often ignored. The pressure, grease injection amount and switch position are normal during the grease filling operation. However, in order to ensure the grease filling effect of the valve, it is sometimes necessary to open or close the valve to check the lubrication effect and confirm that the valve ball or the surface of the valve is evenly lubricated.

  I believe that through the above introduction, everyone has already understood the classification of self-sealing forged steel valves.

STV Delivery 4 Inch PTFE Screwed Spring Check Valve

Today A batch of large Size stainless steel check valves ordered by customers in the UK have been delivered.

Vertical Check Valve is designed for vertical flow (not suitable for down-flow applications). The valve has an angled body design to provide full flow area, and has a two-piece body to facilitate maintenance.
1. Size: DN100
2.Material:CF8M
3. Design as: ASME B16.34
4. Screwed end:NPT
5. Inspection: API598

Stainless steel pneumatic ball valve manufacturers introduce the main features of the ball valve

Stainless steel pneumatic ball valve main features

1. The manual part can be made of steel plate pressed handle or stainless steel cast handle. The handle has a limit structure, and the limit is set at the position where the valve is opened and closed. When the valve is used on the key device, the lock block is provided with a lock hole to lock the switch position to avoid misoperation. There are obvious opening and closing signs on the handle.

2. The valve stem is integrally forged and conditioned by Q641F stainless steel pneumatic ball valve manufacturer 182f (1cr13), and the hardness reaches hb220~250. The valve stem is connected to the handle through a flat key or a spline or a deed, which is versatile and easy to assemble and disassemble. The valve stem is provided with an anti-blowing structure.

3. The valve packing is made of braided, flexible graphite sealing ring or tetrafluoroolefin sealing ring, which makes the valve stem achieve reliable sealing under certain lubrication conditions.

4. According to the needs, the ball valve can be designed as an anti-static structure. A conductive spring is arranged between the ball and the valve stem, the valve stem and the valve body to avoid electrostatic ignition and ignite flammable substances to ensure system safety.

5. The sealing pair has various forms. According to different working conditions, soft seal, hard seal, fireproof seat and other structures can be selected; below dn150 is the form of float ball, and below dn200 is fixed ball form.

6. The auxiliary valve sealing structure can be set at the valve seat of the ball valve. The grease filling valve can be installed at the valve seat and the valve stem. It can be temporarily sealed in case of emergency, and the valve stem can be lengthened as needed to be buried.

What are the structural characteristics of the stainless steel knife gate valve?

Structural features of stainless steel knife gate valve:

The stainless steel gate valve is used in the coal preparation, slagging, urban sewage treatment, food, paper, medicine, petroleum, chemical and other oil, water and steam pipelines of the mine power plant, and the cement slurry and gold ore powder in the pipeline are connected or cut off. , mineral sand, slag, slime, pulp, wood pulp, tailings, fiber, dust, chemical treatment of sewage, sedimentation tanks, asphalt, silo exports, water is not beautiful, grain, slaughterhouse wastewater and other media. The stainless steel ram can prevent seal leakage caused by erosion, and the fine grinding and polishing treatment can achieve better sealing effect. The bottom end of the blade is processed into a blade shape, which has a cutting function for soft materials such as fiber, pulp, and wood pulp, and has excellent opening and blocking dip dyeing. A hard polytetrafluoroethylene scraper is installed on the upper end of the blade to prevent dust, gravel and other abrasive substances from entering the packing box, which can significantly improve the life of the blade. The raised sealing surface of the ram can scrape off the adhesive on the sealing surface and automatically break the roots.
The stainless steel gate valve body is durable and durable. The valve body reinforcement design improves the strength of the valve body, and the double head screw is used to open and close more quickly.

The overall stainless steel material prevents corrosion and damage. The valve body and the packing culvert are carefully forged, wherein the valve body is integrally forged by flange type, and the material can be selected according to the user’s needs: 304, 316, 316L, WCB, 2Crl3, and the sealing ring is made of PTFE reinforced PTFE material, which is resistant to erosion. It is resistant to abrasion and slag.

The full circular design of the parallel channel does not contain slag and is not blocked. The valve plate has 5 support points for a good self-centering of the valve plate. When the valve is in a blocked condition and subjected to back pressure, the valve plate does not shift. The triangular bracket saves raw materials and guarantees the required mechanical function. The knife-type gate valve can also be used with the drive head structure. The scientific meal packing and stuffing box design makes the meal safe and useful and durable. The short structure length can save raw materials, installation space, and also support the strength of the pipeline. The guide block on the valve body of the knife gate valve causes the shutter to behave correctly. The extrusion block ensures that the shutter is usefully sealed.

The V-shaped shutter can be used as a regulating valve. The design is compact, the space is small, the weight is light, the price is cheap, the installation is easy, the wear-resistant anti-blocking method is perfect, the maintenance is convenient, the use is convenient, the service life is long, and the drive assembly can be selected.

The knife-type gate valve has the advantages of simple and compact structure, reasonable design, light material, reliable sealing, sleek operation, small volume, fluent passage, small flow resistance, light weight, easy installation and easy disassembly. It has completely adjusted the common gate valve. The weight of the slab gate valve, globe valve, regulating valve, butterfly valve, ball valve and other valves, such as the weight, flow resistance, large area, difficult to install, etc., can be used to replace the general-purpose shut-off valve and regulating valve, which can work at 1.0MPa. – 2.5MPa, normal operation under the condition of temperature -29-550 °C. The gate of the knife gate valve has a shearing function, which can scrape off the adhesive on the sealing surface and automatically cut off the roots. The stainless steel gate can prevent seal leakage caused by erosion.