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Why do we need to use saturated steam pressure reducing valves?
Why do we need to use saturated steam pressure reducing valves?
All equipment and piping systems have design pressure and maximum working pressure values. During equipment operation, the fluid pressure needs to be lower than the equipment's working pressure within a certain temperature range. If the fluid pressure exceeds the equipment's working pressure, it needs to be reduced to below the equipment's maximum working pressure. This ensures the system and equipment operate properly, reducing the risk of equipment damage and malfunctions due to overpressure.
For saturated steam systems, most boilers are designed to generate steam at high pressure, higher than the operating pressure of the equipment and systems. This is because generating steam at low pressure means the steam moves from the boiler through the transfer piping system before reaching the equipment for use, making it susceptible to moisture re-contamination. Furthermore, larger pipes are needed to accommodate the flow rate for multiple devices. Each device has a maximum working pressure value, so the pressure generated from the boiler is usually higher than the pressure entering the devices. Then, a pressure reducing valve (pressure regulator) is used to reduce the pressure to below the maximum working pressure of the device. Thus, we have several advantages when generating steam at high pressure and then reducing it to low pressure:
- Lower initial investment costs for the main steam pipeline system.
- Before using saturated steam, reducing it from high pressure to low pressure dries the steam, increasing heating efficiency and reducing the risk of water hammer and equipment damage.
- Using saturated steam at low pressure provides higher energy than saturated steam at high pressure.
- Saturated steam at low pressure produces less flash steam, resulting in lower energy losses from flash steam.
Common problems with pressure regulating valves:
- Pressure after the regulating valve is equal to the set pressure during operation, but increases to the inlet pressure when stopped.
- Pressure after the regulating valve is often fluctuating, sometimes higher, sometimes lower than the set pressure.
- Pressure regulating valve diaphragm rupture.
- Slow system heating.
If you are experiencing any of the pressure regulating valve problems listed below, please contact us for advice on solutions.
TL Plus specializes in consulting on system and equipment improvements, and calculating energy recovery for saturated steam systems.
If you need to improve your saturated steam pressure reducing valve system, please contact us via email sales@tlplus-engineering.com
TL Plus is the authorized distributor of Watson McDaniel products in Vietnam and other Asian countries.
Some types of saturated steam pressure reducing (regulating) valves are available:
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