Suzhou Kaitianfu Machinery Co., Ltd

Gates of Gate Valve

Valve Gate

Valve Gate: The core parts of flat gate valves used in the petrochemical industry require high pressure, wear resistance, corrosion prevention against H2S and CO2, especially wellhead and Christmas tree valves have higher requirements.

PRODUCT PARAMETERS FOR Tungsten Carbide Valve Gate

Valve Gate: The core parts of flat gate valves used in the petrochemical industry require high pressure, wear resistance, corrosion prevention against H2S and CO2, especially wellhead and Christmas tree valves have higher requirements. Our company selects Thermal Spraying Technology with using high-quality thermal spraying powder as raw material, adopts supersonic spraying equipment, optimizes thermal spraying process, and supports advanced processing equipment and technology, so that the denseness of coating can meet the gas sealing requirements under up to 140 MPa, the coating porosity <1%, the bonding strength exceeds 75MPa, the hardness reaches HV1500 and the hardness uniformity fluctuates by no more than HV100; the product surface after coating can reach mirror surface, with roughness less than , and flatness no more than 2 bands, which can effectively reduce the coefficient of friction between Valve Gate and valve seat and improve its service life.

Custom Valve Gate Product Data

GATES OF GATE VALVE

Valve Gate: The core parts of flat gate valves used in the petrochemical industry require high pressure, wear resistance, corrosion prevention against H2S and CO2, especially wellhead and Christmas tree valves have higher requirements. 

PRODUCT PARAMETERS

As shown below, here are some tables helping you know more about basic high performance valve gate data: 

1. Common base material and chemical composition

Common Gate Valve Coating Materiails

Valve Gate

PRODUCT PARAMETERS FOR GATE OF GATE VALVE COATING

This part can be illustrated by a table shown below:

VALVE GATE COATING INTRODUCTION

tungsten carbide valve gate

Valve Gate: The core parts of flat gate valves used in the petrochemical industry require high pressure, wear resistance, corrosion prevention against H2S and CO2, especially wellhead and Christmas tree valves have higher requirements.

Since there is an urgent need to improve wear resistance and corrosion resistance of mining and processing equipment in petroleum and petrochemical industries, surface engineering plays an important role in petroleum and petrochemical industries. Techniques of surface engineering are used to treat the surface of materials and improve their surface properties, which will reduce component failure caused by wear and corrosion, and effectively extend service life of parts.

Our company selects Thermal Spraying Technology which using high-quality thermal spraying powder as raw material, adopts supersonic spraying equipment, optimizes thermal spraying process, and supports advanced processing equipment and technology, so that the denseness of coating can meet the gas sealing requirements under up to 140 MPa, the coating porosity <1%, the bonding strength exceeds 75MPa, the hardness reaches HV1500 and the hardness uniformity fluctuates by no more than HV100; the product surface after coating can reach mirror surface, with roughness less than , and flatness no more than 2 bands, which can effectively reduce the coefficient of friction between valve plate and valve seat and improve its service life.

GATE AND THERMAL SPRAYING

Thermal Spraying Valve Gate

Valve Gate: The core parts of flat gate valves used in the petrochemical industry require high pressure, wear resistance, corrosion prevention against H2S and CO2, especially wellhead and Christmas tree valves have higher requirements. Brief Introduction

The definition of thermal spraying technology in the national standard GB/T18719-2002 "Thermal spraying terminology, classification": The Tungsten Carbide Coating uses a heat source to heat the spray material to a dissolved or semi-dissolved state, and spray deposited at a certain speed to after pretreatment of substrate surface coating method. Thermal spraying technology is to create a special working surface on the surface of ordinary materials, it can achieve: a variety of functions such as anti-corrosion, wear-resisting, anti-friction, high temperature resistance, oxidation resistance, heat insulation, insulation, electrical conduction, anti-microwave radiation, etc, through this technology, the goal of saving materials and saving energy is achieved. We call this special work surface a coating, and the working method for making this coating is called thermal spraying. Thermal spray technology is one of the important components of surface process technology, which accounts for about one-third of surface engineering technology.

Characteristics

1. The device is simple in structure and flexible in operation. This technology can be used for large-area spraying of large components or for spraying at specified locations; The operation process can be carried out in the factory room or on the outdoor site.
2. Flexible process and less operating procedures, it can quickly repair defects and reduce processing time.
3. Well-adapted, the operation process is generally not limited by the size of the work place and the location.
4. The thickness of the coating can be controlled

Tungsten Carbide Valve Gate

high performance valve gate

Valve Gate: The core parts of flat gate valves used in the petrochemical industry require high pressure, wear resistance, corrosion prevention against H2S and CO2, especially wellhead and Christmas tree valves have higher requirements.

Tungsten carbide is one of the most important raw materials for cemented carbide. It's a black hexagonal crystal with metallic luster, chemical stability, hardness and diamond similarity, and it's also a good conductor of electricity and heat. In tungsten carbide, carbon atoms are intercalated into the gap of the tungsten metal lattice without destroying the crystal lattice of the original metal, thereby forming a gap solid solution, and thus the tungsten carbide is also called an interstitial compound (or an intercalation compound). Tungsten carbide is suitable for machining at high temperatures-- it can make cutting tools, structural materials for kiln, jet engines, gas turbines, nozzles, etc.

The hardness of cobalt-based carbonized tungsten alloy powder or nickel-based carbonized tungsten alloy powder and chromium-based carbonized tungsten alloy powder sprayed by HVOF tungsten carbide coating can reach 850 degrees of high temperature of HV1200. Therefore, the valve parts are resistant to abrasive, corrosion, high temperature and oxidation. The process exceeds the processes of manual surfacing, chrome plating, carburizing, quenching and tempering, etc., so that the production efficiency can be increased by more than 2 times, the production cost can be reduced by more than 50%, and the service life can be extended by several tens of times.

INTRODUCTION TO HVOF Coating

custom valve gates

Valve Gate: The core parts of flat gate valves used in the petrochemical industry require high pressure, wear resistance, corrosion prevention against H2S and CO2, especially wellhead and Christmas tree valves have higher requirements. 

Brief Introduction of HVOF TUNGSTEN CARBIDE COATING

High-velocity oxygen-fuel is a new thermal spray technology invented by Browing in the United States in 1981. Nowadays, it is generally called HVOF (High-velocity oxygen-fuel). The flame generated by this technology is a high-temperature, high-speed combustion flame flow generated by using a hydrocarbon-based gas or hydrogen such as propane or propylene, and high-pressure oxygen in a combustion chamber or in a special nozzle. The velocity of the combustion flame can reach more than five Mach (1500 m/s). The axial direction of the powder is fed into the flame, and the sprayed particles can be heated to a molten or semi-molten state. Accelerate the velocity of the combustion flame to a speed of up to 300-500 m/s or even higher, resulting in a high-density, dense, high-quality coating.

The HVOF has a high speed, but the temperature is relatively low, about 300 ° C. For the spraying of WC-Co cemented carbide, the decomposition of WC during spraying can be effectively suppressed. The coating not only has high bonding strength, but also has excellent compactness and abrasive resistance. The abrasive resistance of the coating greatly exceeds that of the plasma sprayed layer, which is equivalent to the explosive sprayed layer and exceeds the hard chrome layer and the sprayed layer. The range of applications is extremely wide.

Tungsten carbide valve gate FAQ FOR CLIENTS

Stainless steel valve gates

Valve Gate: The core parts of flat gate valves used in the petrochemical industry require high pressure, wear resistance, corrosion prevention against H2S and CO2, especially wellhead and Christmas tree valves have higher requirements.

PRODUCT PARAMETERS

Valve Gate: The core parts of flat gate valves used in the petrochemical industry require high pressure, wear resistance, corrosion prevention against H2S and CO2, especially wellhead and Christmas tree valves have higher requirements. Our company selects thermal spraying technology which using high-quality thermal spraying powder as raw material, adopts supersonic spraying equipment, optimizes thermal spraying process, and supports advanced processing equipment and technology, so that the denseness of coating can meet the gas sealing requirements under up to 140 MPa, the coating porosity <1%, the bonding strength exceeds 75MPa, the hardness reaches HV1500 and the hardness uniformity fluctuates by no more than HV100; the product surface after coating can reach mirror surface, with roughness less than , and flatness no more than 2 bands, which can effectively reduce the coefficient of friction between Valve Gate and valve seat and improve its service life.

High Performance Valve Gate DISPLAY

Wear Resistance Valve Gate

Valve Gate: The core parts of flat gate valves used in the petrochemical industry require high pressure, wear resistance, corrosion prevention against H2S and CO2, especially wellhead and Christmas tree valves have higher requirements.

PRODUCT PARAMETERS

Valve Gate: The core parts of flat gate valves used in the petrochemical industry require high pressure, wear resistance, corrosion prevention against H2S and CO2, especially wellhead and Christmas tree valves have higher requirements. Our company selects thermal spraying technology which using high-quality thermal spraying powder as raw material, adopts supersonic spraying equipment, optimizes thermal spraying process, and supports advanced processing equipment and technology, so that the denseness of coating can meet the gas sealing requirements under up to 140 MPa, the coating porosity <1%, the bonding strength exceeds 75MPa, the hardness reaches HV1500 and the hardness uniformity fluctuates by no more than HV100; the product surface after coating can reach mirror surface, with roughness less than , and flatness no more than 2 bands, which can effectively reduce the coefficient of friction between Valve Gate and valve seat and improve its service life.

Gate Valve Seat

valve seat

Valve Seat: The detachable surface parts in valve are used to support the valve spool in the fully closed position and constitute a sealed part. Generally, valve seat diameter is the maximum flow diameter of the valve. 

PRODUCT PARAMETERS FOR Stainless Steel Valve Seats 

Valve Seat: The detachable surface parts in valve are used to support the valve spool in the fully closed position and constitute a sealed part. Generally, valve seat diameter is the maximum flow diameter of the valve. Elastic sealing material and small actuator's thrust force is used to obtain tight seal of air bubble, compression valve seat's sealing stress elastically deforms the material and squeezes it into the rough surface of the matching metal part to block all leakage paths. The permeability of material is a basis for small amount of leakage for fluid. The seal must be carefully fixed to prevent cracking and air leakage due to differential pressure. Bonding soft valve seat to metal part is one way, but it cannot completely solve the problem because the bond breaks and fails when exposed to thermal shock. A sufficiently large pressure drop will destroy the bonding material. Thermal spraying technology ultrasonic spraying equipment is used to optimize thermal spraying process so that the denseness of coating can meet the gas sealing requirements under up to 140MPa, the porosity of coating <1%, the bonding strength exceeds 75MPa, the hardness can reach HV1500 and the hardness uniformity fluctuates by no more than HV100; the product surface after coating can reach mirror surface, with roughness less than , and flatness no more than 2 bands, which can effectively reduce the coefficient of friction between Valve Gate and valve seat and improve its service life.

Tungsten Carbide Valve Seats Product Data

Valve Seat: The detachable surface parts in valve are used to support the valve spool in the fully closed position and constitute a sealed part. Generally, valve seat diameter is the maximum flow diameter of the valve.

PRODUCT PARAMETERS

As shown below, here are some tables helping you know more about basic High Performance Valve Seat data: 

1. Common base material and chemical composition

Common Valve Seat Coating Materials

Valve Seat: The detachable surface parts in valve are used to support the valve spool in the fully closed position and constitute a sealed part. Generally, valve seat diameter is the maximum flow diameter of the valve.

PRODUCT PARAMETERS FOR OUR high performance valve seat

This part can be illustrated by a table shown below:

Valve Seat Coating Introduction

Stainless steel valve seats

Valve Seat: The detachable surface parts in valve are used to support the valve spool in the fully closed position and constitute a sealed part. Generally, valve seat diameter is the maximum flow diameter of the valve.

PRODUCT PARAMETERS

Since there is an urgent need to improve wear resistance and corrosion resistance of mining and processing equipment in petroleum and petrochemical industries, surface engineering plays an important role in petroleum and petrochemical industries. Techniques of surface engineering are used to treat the surface of materials and improve their surface properties, which will reduce component failure caused by wear and corrosion, and effectively extend service life of parts.

Our company selects Thermal Spraying Technology which using high-quality thermal spraying powder as raw material, adopts supersonic spraying equipment, optimizes thermal spraying process, and supports advanced processing equipment and technology, so that the denseness of coating can meet the gas sealing requirements under up to 140 MPa, the coating porosity <1%, the bonding strength exceeds 75MPa, the hardness reaches HV1500 and the hardness uniformity fluctuates by no more than HV100; the product surface after coating can reach mirror surface, with roughness less than , and flatness no more than 2 bands, which can effectively reduce the coefficient of friction between valve plate and valve seat and improve its service life.

Seat And Thermal Spraying

Valve Seat: The detachable surface parts in valve are used to support the valve spool in the fully closed position and constitute a sealed part. Generally, valve seat diameter is the maximum flow diameter of the valve. 

PRODUCT PARAMETERS

Brief Introduction

The definition of thermal spraying technology in the national standard GB/T18719-2002 "Thermal spraying terminology, classification": The thermal spraying technology uses a heat source to heat the spray material to a dissolved or semi-dissolved state, and spray deposited at a certain speed to after pretreatment of substrate surface coating method. Thermal spraying technology is to create a special working surface on the surface of ordinary materials, it can achieve: a variety of functions such as anti-corrosion, wear-resisting, anti-friction, high temperature resistance, oxidation resistance, heat insulation, insulation, electrical conduction, anti-microwave radiation, etc, through this technology, the goal of saving materials and saving energy is achieved,this tungsten carbide valve seats. We call this special work surface a coating, and the working method for making this coating is called thermal spraying. Thermal spray technology is one of the important components of surface process technology, which accounts for about one-third of surface engineering technology.

Tungsten Carbiden Valve Seat

Stainless steel Valve Seats

Valve Seat: The detachable surface parts in valve are used to support the valve spool in the fully closed position and constitute a sealed part. Generally, valve seat diameter is the maximum flow diameter of the valve.

PRODUCT PARAMETERS

Tungsten carbide is one of the most important raw materials for cemented carbide. It's a black hexagonal crystal with metallic luster, chemical stability, hardness and diamond similarity, and it's also a good conductor of electricity and heat. In tungsten carbide, carbon atoms are intercalated into the gap of the tungsten metal lattice without destroying the crystal lattice of the original metal, thereby forming a gap solid solution, and thus the tungsten carbide is also called an interstitial compound (or an intercalation compound). Tungsten carbide is suitable for machining at high temperatures-- it can make cutting tools, structural materials for kiln, jet engines, gas turbines, nozzles, etc.

The hardness of cobalt-based carbonized tungsten alloy powder or nickel-based carbonized tungsten alloy powder and chromium-based carbonized tungsten alloy powder sprayed by HVOF tungsten carbide coating can reach 850 degrees of high temperature of HV1200. Therefore, the valve parts are resistant to abrasive, corrosion, high temperature and oxidation. The process

Introduction to Hvof Tungsten Carbide Coating

HVOF COATING

Cemented Carbide Valve Seat

Valve Seat: The detachable surface parts in valve are used to support the valve spool in the fully closed position and constitute a sealed part. Generally, valve seat diameter is the maximum flow diameter of the valve. 

PRODUCT PARAMETERS FOR  HVOF COATING

Brief Introduction

High-velocity oxygen-fuel is a new thermal spray technology invented by Browing in the United States in 1981. Nowadays, it is generally called HVOF (High-velocity oxygen-fuel). The flame generated by this technology is a high-temperature, high-speed combustion flame flow generated by using a hydrocarbon-based gas or hydrogen such as propane or propylene, and high-pressure oxygen in a combustion chamber or in a special nozzle. The velocity of the combustion flame can reach more than five Mach (1500 m/s). The axial direction of the powder is fed into the flame, and the sprayed particles can be heated to a molten or semi-molten state. Accelerate the velocity of the combustion flame to a speed of up to 300-500 m/s or even higher, resulting in a high-density, dense, high-quality coating.

The HVOF has a high speed, but the temperature is relatively low, about 300 ° C. For the spraying of WC-Co cemented carbide, the decomposition of WC during spraying can be effectively suppressed. The coating not only has high bonding strength, but also has excellent compactness and abrasive resistance. The abrasive resistance of the coating greatly exceeds that of the plasma sprayed layer, which is equivalent to the explosive sprayed layer and exceeds the hard chrome layer and the sprayed layer. The range of applications is extremely wide.

Tungsten Carbide Valve Seats FAQ FOR CLIENTS

Custom Valve Seats

Valve Seat: The detachable surface parts in valve are used to support the valve spool in the fully closed position and constitute a sealed part. Generally, valve seat diameter is the maximum flow diameter of the valve. 

PRODUCT PARAMETERS

Valve Seat: The detachable surface parts in valve are used to support the valve spool in the fully closed position and constitute a sealed part. Generally, valve seat diameter is the maximum flow diameter of the valve. Elastic sealing material and small actuator's thrust force is used to obtain tight seal of air bubble, compression valve seat's sealing stress elastically deforms the material and squeezes it into the rough surface of the matching metal part to block all leakage paths. The permeability of material is a basis for small amount of leakage for fluid. The seal must be carefully fixed to prevent cracking and air leakage due to differential pressure. Bonding soft valve seat to metal part is one way, but it cannot completely solve the problem because the bond breaks and fails when exposed to thermal shock. A sufficiently large pressure drop will destroy the bonding material. HVOF tungsten carbide coating ultrasonic spraying equipment is used to optimize thermal spraying process so that the denseness of coating can meet the gas sealing requirements under up to 140MPa, the porosity of coating <1%, the bonding strength exceeds 75MPa, the hardness can reach HV1500 and the hardness uniformity fluctuates by no more than HV100; the product surface after coating can reach mirror surface,

High Performance Valve Seat Display

tungsten carbide valve seats

Valve Seat: The detachable surface parts in valve are used to support the valve spool in the fully closed position and constitute a sealed part. Generally, valve seat diameter is the maximum flow diameter of the valve.

PRODUCT PARAMETERS

Valve Seat: The detachable surface parts in valve are used to support the valve spool in the fully closed position and constitute a sealed part. Generally, valve seat diameter is the maximum flow diameter of the valve. Elastic sealing material and small actuator's thrust force is used to obtain tight seal of air bubble, compression valve seat's sealing stress elastically deforms the material and squeezes it into the rough surface of the matching metal part to block all leakage paths. The permeability of material is a basis for small amount of leakage for fluid. The seal must be carefully fixed to prevent cracking and air leakage due to differential pressure. Bonding soft valve seat to metal part is one way, but it cannot completely solve the problem because the bond breaks and fails when exposed to thermal shock. A sufficiently large pressure drop will destroy the bonding material. Ultrasonic spraying equipment is used to optimize thermal spraying technology process so that the denseness of coating can meet the gas sealing requirements under up to 140MPa, the porosity of coating <1%, the bonding strength exceeds 75MPa, the hardness can reach HV1500 and the hardness uniformity fluctuates by no more than HV100; the product surface after coating can reach mirror surface, with roughness less than , and flatness no more than 2 bands, which can effectively reduce the coefficient of friction between Valve Gate and valve seat and improve its service life.

Ball Valve Seat

High Performance Valve Seat

Globe And Supporting Valve Seat: The core parts of globe valves used in the petrochemical industry require high pressure, wear resistance and corrosion protection. 

PRODUCT PARAMETERS

Globe And Supporting Valve Seat: The core parts of globe valves used in the petrochemical industry require high pressure, wear resistance and corrosion protection. Our company uses the same process as Valve Gate spraying above, so that the coating performance can be the same as the Valve Gate.