Dears In Petrochemical plant we have 3 types of codification of On-Off valves in P&ID which are XV, HV and KV valves.
I want to know what is the difference between the three codification?
XV valves are on/off valves that are typically used to quickly isolated a fluid and typically provide right shut off capabilities. They are not used to modulate or vary the flow.
HV Valves are Hand Valves. Manually operated.
KV Valves are Time, Schedule, Time Rate of Change Valves
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The terms XV, HV, and KV are often used in industrial process control and automation to denote different types of valves. They’re shorthand for various valve types, often used in process flow diagrams (PFDs) and piping and instrumentation diagrams (P&IDs).
These abbreviations can vary somewhat by industry or region, but generally, they mean:
- XV: Shorthand for a solenoid valve. These are usually electrically controlled and are commonly used in process automation systems for the on-off control of liquids or gases.
- HV: Often denotes a hand valve (sometimes known as a manual valve). These are typically manually operated and used for isolation purposes. They can be turned on or off by turning a handle or wheel.
- KV: This abbreviation can refer to a control valve, depending upon the industry context. Control valves can provide more complex functions than simply on/off, such as maintaining specific flow rates or pressures. They are usually automated, and controlled by a pneumatic or hydraulic actuator in response to signals from a process controller.
It’s important to note that while these descriptions provide a general guideline, actual usage can vary by industry and region, and sometimes by individual company practices. Always refer to the specific P&ID legend or company documentation to be sure of the meaning in a particular context.