1. Main Accessories of Valves
- Actuators: Pneumatic actuator, Electric actuator, Hydraulic actuator, Starter actuator
- Positioners: Pneumatic valve positioner, Electric valve positioner
- Accessories:
- Pneumatic relay
- Pneumatic converter
- Pneumatic filter
- Electro-hydraulic servo
- Servo amplifier
- Limit switch
- Solenoid valve
- Handwheel mechanism
- Pressure gauge
- Pressure reducing valve
- Safety valve
- Thermometer
- Flowmeter
2. Valve Body Materials
Valve body materials should be selected according to pressure, temperature, corrosion resistance, machinabilità, and economy.
- Gray cast iron: Suitable for PN ≤ 1.0 MPa, medium temperature ≤ 200°C, such as water, steam, air, and gas.
- Ductile iron: Generally suitable for PN ≤ 2.5 MPa, some high-grade types can reach 4.0 MPa. Used for water, steam, and oil.
- Carbon steel: Suitable for PN ≤ 32.0 MPa, medium temperature ≤ 425°C, such as water, steam, and oil.
- Low alloy steel: Suitable for PN ≤ 16.0 MPa, medium temperature ≤ 550°C, such as water, steam, and oil.
- Low-temperature steel: Suitable for low-temperature conditions, down to -196°C, for cryogenic applications.
- Stainless acid-resistant steel: Suitable for corrosive media such as nitric acid, acetic acid, strong oxidizing media.
3. Valve Trim Materials
(1) Valve Core Materials
- Brass, bronzo: For low-pressure, small-diameter valves.
- Gray cast iron: For medium pressure ≤ 1.0 MPa.
- Carbon steel: For medium pressure ≤ 2.5 MPa.
- Alloy steel: For higher pressure and temperature.
- Austenitic stainless steel: For corrosive media.
(2) Valve Stem Materials
- 35 acciaio, 40Cr: For medium and low-pressure valves.
- 1Cr13, 2Cr13: For medium-pressure, medium-temperature valves.
- Austenitic stainless steel: For corrosive environments.
(3) Valve Stem Nut Materials
- Brass, bronzo: Widely used due to wear resistance.
- Nodular cast iron, alloy cast iron: For higher strength requirements.
(4) Sealing Surface Materials
- Brass, bronzo, gray cast iron: For low-pressure valves.
- Alloy steel, surfacing alloy: For high-pressure, high-temperature valves.
- Stellite, cemented carbide: For wear-resistant and corrosion-resistant applications.
- Rubber, plastica (PTFE): For corrosion-resistant and soft-sealing valves.
4. Importance of Precision Machining
In valve manufacturing, precision machining of these components is critical to ensuring:
- Dimensional accuracy
- Surface finish
- Long-term reliability under demanding conditions
Rapido has over 18 years of experience in high-precision CNC machining.
- Products cover medical, communications, optics, drones, intelligent robots, automobile, and office automation parts.
- Equipped with 4-axis, 5-axis machining centers and advanced inspection equipment such as precision projectors, coordinate measuring machines, and spectrometers.
- Machining accuracy up to 0.01 mm, testing accuracy up to 0.001 mm.
RapidEfficient is your first choice for precision valve parts processing.
