How do you choose valve material?
How do you choose valve material?
For large valves the load to operate the valve can be high so that high strength materials are preferred. However, these must have adequate corrosion resistance for the fluid being handled. For coated carbon steel or cast iron bodies the usual choice for stems is a stainless steel.
What material is used in valves?
| Base material | Valve body | Ball |
| Bronze / Brass | Bronze (CAC401) Brass (C3771) | Brass Stainless steel |
| Cast iron | Gray cast iron (FC200) | Stainless steel |
| Ductile iron | Ductile iron castings (FCD-S) | Stainless steel |
| Cast steel | Carbon steel castings for high temperature / pressure service (SCPH 2) | Stainless steel |
How do you choose a valve class?
Valve type selection should take account of :
- Required function.
- Service conditions.
- Fluid type and condition.
- Fluid characteristics.
- Frequency of operation.
- Isolation requirements.
- Maintenance requirements.
- Environmental considerations.
What is a butterfly valve seat?
Essentially, a valve seat is where the moving component of a valve rests when in the closed position. In butterfly valve applications, the disc rests securely on the seat to close and seal the valve. Seats are designed to keep the seal intact despite the thermal, friction, and impact stresses of a process.
What is high pressure valve?
A high pressure valve is a valve that can operate in pressures above 500 PSI.
What are the steps in selection of valve?
Control valve selection typically depend upon the following:
- Process fluid characteristics.
- Process conditions. Flow rate. Temperature. Pressure.
- Differential pressure.
- Valve style.
- Controls.
- Desired flow characteristics.
- Desired pressure drop.
- Turn-down ratio.
What type of brass is used for valves?
Wrought brasses, alloys of copper and zinc, are frequently used as the body material for metal mini check valves and ball valves. A major reason for this is brass performs well at temperatures ranging from about -325 to 425 °F (-198 to 218°C).
What is valve steel?
Bearing steels are special class of low alloy steels, typically with 1% carbon and 1.4% chromium. Manganese and Molybdenum are added in certain special cases.
How do I choose a good valve?
The right valve choice means matching the valve’s size to expected flow through the system. Know the chemical compatibility requirements. The valve materials need to be compatible with the gases or liquids flowing through it. Plastic valves usually resist harsh or corrosive chemicals better than metal valves.
How do I choose a valve size?
When sizing a control valve, the rule of thumb is to size it so that it operates somewhere between 20-80% open at maximum required flow rate and whenever possible, not much less than 20% open at the minimum required flow rate.
What is EPDM valve?
EPDM stands for Ethylene Propylene Diene Monomer rubber. EPDM solenoid valve seals are well suited for use with hot waterand steam due to EPDM’s excellent resistance to heat. The working temperatures of EPDM is approximately between -10 °C to +140 °C. EPDM is unsuitable for use with most oils and fuels.
What is EPDM seat material?
EPDM is the abbreviated name for Ethylene Propylene Diene Monomer. It is the most universal and economical of seat materials offered by Bray; that is, it may be used in a wider range of applications than BUNA-N (hydrocarbons are EPDM’s main Achilles’ heel.)
