Valve Quality
Valvetech's Commitment to Quality
Valvetech’s valves are robustly constructed with high-grade raw materials, combining proven design features and modern manufacturing techniques. These ensure that the temperature and pressure ratings can sustain a wide range of fluids, steam, and gases. Valvetech uses quality raw materials from reputable international foundries, with Statistical Quality Assurance Inspections at every stage of the manufacturing process, guaranteeing sustained quality in the supply of products.
Valvetech achieves total customer satisfaction through quality and quantity, consistently, which is achieved by supplying valves according to the applicable codes and standards; this guarantees value for money for top-tier products. Continuous improvements in processes, pricing, stock volumes, and market opportunities demonstrate Valvetech’s commitment to quality to remain a strategic and operational priority.
Product Material Guide
Pressure Ratings:
Class 150: Designed to withstand a working pressure of 150psi. This makes them an excellent choice for applications where there is a moderate amount of pressure, such as water supply systems and air compressors. Great for HVAC, water, oil and gas, petroleum, mining, and chemicals, where strength, durability, and cost-effectiveness are important
Class 125: Designed to withstand a working pressure of 125psi. A good choice for applications where there is a low amount of pressure for general-purpose applications
PN25: Designed to withstand a working pressure of 25 bar (360psi). This makes them an excellent choice for applications where there is a constant amount of pressure, such as industrial piping and fire sprinkler systems
PN16: Designed to withstand a working pressure of 16 bar (232psi). Great choice for applications where there is a moderate amount of pressure and general-purpose applications, such as water supply systems, mining, energy, HVAC, and chemical
PN14: Designed to withstand a working pressure of 14 bar (193psi). A cost-effective solution for applications where there is a low to medium amount of pressure, and suitable for harsh environments, such as seawater and industrial chemicals
Ductile Iron:
ASTM A536: Excellent mechanical properties due to its spheroidal graphite microstructure, providing a balance of strength, ductility, and wear resistance
65-45-12: Tensile Strength of 65ksi (min), Yield Strength of 45ksi (min), Elongation of 12% (min); a versatile material for components requiring strength and ductility
Melting Temperature: 1,120°C due to a carbon content of 3.4%, silicon content of 2.35%, and a microstructure that is mostly ferritic
Compressive Strength: 429MPa (62,000psi); due to spheroidizing, the graphite in the iron forms into small, round nodules, improving strength and ductility
Cast Iron:
ASTM A126: Durable, non-corrosive and cost-effective for a wide range of applications
Class B: High tensile strength of 275 to 400MPa (39,923 to 58,000psi)
Melting Temperature: 1,250°C due to a carbon content of 3.5%, silicon content of 1.8% to 2.3%, and a microstructure that is mostly ferritic
Compressive Strength: 572MPa (82,000psi); due to casting quality, microstructure, and specific alloys
Steel:
CF8M (aka SS2205 Duplex): Excellent corrosion resistance and strength. Used in high-pressure chemical processing valves. Melts at 1,500°C with a tensile strength of 130ksi
SS304: Good corrosion resistance, machinability, and formability. Melts at 1,400°C with a tensile strength of 70ksi
SS316: Good corrosion resistance, especially chlorides. Melts at 1,400°C with a tensile strength of 70ksi
SS410: Known for strength and cost-effectiveness. Melts at 1,450°C with a tensile strength of 100ksi
SS416: Good strength and toughness. Melts at 1,450 °C with a tensile strength of 100 ksi
SS420: Excellent corrosion resistance and moderate toughness. Melts at 1450°C with a tensile strength of 95ksi
Q235 Steel: renowned for its affordability and versatility. Melts at 1420°C with a tensile strength of 375ksi
45# Steel: Recognized for its high machinability and durability. Melts at 1420°C with a tensile strength of 80ksi
Carbon Steel: Wide available and affordable. Melts at 1370°C and varying tensile strengths depending on the grade
Q235A: Good weldability, formability, and strength. Melting at 1493°C with a tensile strength of 34ksi
Liners:
EPDM: Good resistance to chemicals, ozone, and weathering. Melts at 171°C with a tensile strength of 17MPa
NBR: Good resistance to oil and fuels. Melts at 120°C with a tensile strength of 21MPa
Teflon: Excellent resistance to chemicals, heat, and wear. Melts at 327°C with a tensile strength of 26MPa
Specialised Metals:
13 Chrome: Good corrosion resistance, machinability, and formability. Melts at 1,400°C with a tensile strength of 70ksi
Brass Hpb57-3: Exceptional corrosion resistance, durable strength. Melts at 900°C with a tensile strength of 38ksi
ASTM A105: Used in high-temperature applications due to good strength and toughness. Melts at 1538°C with a tensile strength of 55ksi
ASTM A276 420: High-carbon martensitic stainless steel that offers excellent hardness and strength. Melts at 1,455°C with a tensile strength of 515MPa
ASTM A216 WCB: Carbon steel with good strength, corrosion resistance, and availability. Melts at 1,493°C with a tensile strength of 80ksi
ASTM A307 B: Cost-effectiveness with good availability. Melts at 1,510°C with a tensile strength of 60ksi
ASTM B16: Used in high-pressure applications due to good strength and corrosion resistance. Melts at 1493 °C with a tensile strength of 34ksi
ASTM B62: Used in low-pressure applications due to cost-effectiveness. Melts at 1425°C with a tensile strength of 27ksi
Aluminium: lightweight metal with good corrosion resistance and thermal conductivity. Melts at 660°C with a tensile strength of 14ksi
PTFE: Excellent chemical resistance and low friction. Melts at 327°C with a tensile strength of 26ksi
Graphite: Non-metallic material with excellent thermal conductivity, lubricity, and chemical and abrasion resistance. Melts at 3,652°C with a tensile strength of 1-2ksi
Flexible Graphite: Excellent flexibility, and chemical and abrasion resistance. It has a melts at 3652°C and a tensile strength of 0.5-1ksi
NPDI: Corrosion-resistant material with high tensile strength and good weldability. Melts at 1,200°C with a tensile strength of 45ksi
Wrought Carbon Steel (WCB): Good strength, corrosion resistance, and cost-effectiveness. Melts at 1,493°C with a tensile strength of 34 ksi
Standards
Design
DIN EN593: Emphasis on the requirements for the safety of valves, such as the ability to withstand pressure and temperature extremes, and the prevention of leaks. Also focuses on the requirements around the durability of materials and the accuracy of manufacturing tolerances. Covers the design of end connections of valves, including dimension, in metric units. Tighter tolerances and intended for valves that are used in critical applications
MSS SP-70: Sets requirements for the design, materials, and testing of valves, and ensures safety, reliability, and compatibility across manufacturers and industry components and applications. Covers the design of valves and requires that the dimensions be compatible with ANSI B16.10. Not tolerant specific and doesn’t specify Valve End materials, but does require fluid compatibility
JB/T8937: A common Chinese framework used for the design of valves, including face-to-face dimensions. Does not include tolerances nor materials.
Comparison: DIN EN593 is the most comprehensive and demanding standard. It is intended for valves that are used in critical applications. MSS SP-70 is a less comprehensive standard, but it is still widely used in the United States. JB/T8937 is a Chinese standard that is intended for valves that are used mainly in China
End
DIN EN1092: Ensure the interchangeability of End Connections of valves. It does this by setting requirements for the dimensions in metric units, and tolerances of end connections. Specifies the materials that can be used for End Connections, and intended for valves that are used in critical applications
JB/T17241.6: A common framework with additional requirements for the end connections of valves used in China, ensuring the interchangeability. Dimensions specified in metric and imperial units. Does not specify material-fluid compatibility
Comparison: DIN EN1092 is a more comprehensive and demanding standard than JB/T17241.6. This is because DIN EN1092 is intended for valves that are used in critical applications.
Flanges
ANSI B16.1: Specifies the dimensions in imperial units and pressure ratings of flanges, enabling manufacturers to produce flanges that are compatible with other flanges and components. Focuses on Cast and Ductile Iron, as well as steel. Pressure ratings from 125psi to 2,500psi
ANSI B16.5: Specifies a common framework for the dimensions in imperial and metric units, pressure ratings, materials, and testing of steel pipe flanges and flanged fittings. Pressure ratings from 150psi to 2,500psi. Includes tolerances for flanges and flange fittings
Comparison: ANSI B16.5 is a more comprehensive standard than ANSI B16.1. This is because ANSI B16.5 covers the dimensions, pressure ratings, materials, and testing of steel pipe flanges and flanged fittings, while ANSI B16.1 only covers the dimensions and pressure ratings of flanges.
Face to Face
ANSI B16.10: Provides a common framework for the face-to-face dimensions in imperial units, including tolerance specification
DIN EN558: Specifies the dimensions in metric units, of the face-to-face distances of metal valves used in flanged pipe systems. This means that valves that meet the standard will have the same face-to-face distance, regardless of the manufacturer, including tolerance specification
JB/T8937: Provides a common framework for the face-to-face dimensions, in both imperial and metric units, of valves used in China
Comparison: ANSI B16.10 is the most widely used standard for the face-to-face dimensions of valves. It is a comprehensive standard that covers the dimensions, tolerances, and materials of valves. DIN EN558 is a European standard that is similar to ANSI B16.10, but it uses metric units. JB/T8937 is a Chinese standard that is similar to ANSI B16.10, however, it does not specify tolerance levels
ISO Standards
ISO 9001:2015
Shell Test: Water 350 PSIG 2.41Mpa
Seat Test: Water 200 PSIG 1.38Mpa
Testing
Ductile Iron
Shell Test: Water 350 PSIG 2.41Mpa
Seat Test: Water 200 PSIG 1.38Mpa
Ball Valves
Shell test 2.4Mpa
Seal test 1.76Mpa
Air test 0.6Mpa
