Solenoid Valves for Steam

Steam Solenoid Valves

Solenoid valves for saturated steam and hot water are specifically designed to cope with the aggressive nature and temperature of hot steam. Steam being fundamentally water it is not surprising that many solenoid valves designed for use with steam are made from either brass or bronze.

There are two common types of steam solenoid valve either direct acting as found in a most miniature solenoid valves with small 1/8", 1/4", 3/8" or 1/2" threaded port or pressure assisted (also known as servo or floating piston) solenoid valve as typically found from sizes 1/2", 3/4", 1", 11/4", 11/2" and 2" BSP or NPT Thread or even flanged PN16, ANSI150Lb or JIS10K port sizes DN25, DN32, DN40, DN50, DN65, DN80, DN100, DN125, DN150, DN200, DN250 and DN300.

Steam solenoid valves are typically normally closed (power to open) so the fail-safe position is closed, there are options for normally open (power to close) fail-safe open but really it is wise to avoid these for health and safety reasons as without power supply the valve will stay open.

Solenoid Valve Steam | Materials | Industries.

Steam solenoid valves are available in a range of materials including Brass, Bronze, Stainless Steel and Cast Iron which can be used depending on the application and environment. Stainless steel solenoid valves are typically used for food industry applications where as Brass or Bronze are generally used for industrial systems such as steam boiler outlets, commercial steam washing machines or steam presses in laundries, vending coffee machines, sterilising systems, moulding and autoclave systems.

Seals for Steam

The internal seals of steam solenoid valves should generally PTFE, which can withstand steam temperatures up to 200 centigrade however a cheaper elastomer seal such as EPDM has been used in some instances but this has temperature limitations of under 150 degrees centigrade. The solenoid coils will also be rated for high temperature applications, typically H (180 C) or N (200C) Rated

Helpful Hint: It is best practise to use a solenoid valve with PTFE seals which are rated up to 200C for steam, however for hot water EPDM can be OK up to about 150C maximum.

Steam and Hot Water Applications.

Solenoid valves for steam and hot water applications have been designed to cope with the severe temperature and aggressive nature of steam up to 185ºC or even 200ºC and beyond, making them ideal for steam injection systems, flat irons, and dryers, laundries, steam boiler control and blow down, steam sterilising systems and autoclaves. Steam rated and hot water rated solenoid valves are available in Brass, Bronze and Stainless Steel.

Steam Pressure in Relation to Temperature.

The temperature of steam in basic terms typically relates directly to its pressure. For example at normal atmospheric pressure i.e. 1bar absolute or 0 bar gauge water turns to steam at 99.6°C, however the more pressure that is applied the higher the steam temperature will be, for example at 10 bar gauge pressure steam will be at 184.1 degrees centigrade. This is why most steam solenoid valves are rated to 10 bar as they can withstand a steam media temperature up to 185°C. However some steam solenoid valves are designed to work at 12 bar steam which you can see in the below steam pressure to steam temperature conversion table equates to 191.6°C.

Published: 19-12-2015 Author: Mike Freye Category: Steam