Sample interview questions: Can you explain your knowledge of different types of control valves used in hydronic systems and their applications?
Sample answer:
Types of Control Valves in Hydronic Systems
1. Two-Way Control Valves:
- Allow or restrict flow in a single direction.
- Types: globe valves, ball valves, butterfly valves.
- Applications: isolation, balancing, and manual flow control.
2. Three-Way Control Valves:
- Direct flow from a single inlet to either of two outlets.
- Types: diverter valves, mixing valves, z-valves.
- Applications: temperature control, flow diversion, zone isolation.
3. Four-Way Control Valves:
- Control flow in two or more directions simultaneously.
- Types: flow dividers, flow limiters, flow reversal valves.
- Applications: complex flow control, system protection, and energy conservation.
4. Pressure-Independent Control Valves (PICVs):
- Maintain a constant differential pressure across the valve, regardless of system pressure fluctuations.
- Applications: balancing hydronic systems, ensuring proper flow and temperature control.
5. Thermostatic Control Valves: