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    Steam Trap Types

    There are two basic designs for the thermostatic steam trap, a bimetallic and a balanced pressure design. Both designs use the difference in temperature between live steam and condensate or air to control the release of condensate and air from the steam line.

    Thermostatic or Bimetallic

    In a thermostatic bimetallic trap it is common that an oil filled element expands when heated to close a valve against a seat. It may be possible to adjust the discharge temperature of the trap – often between 60oC and 100oC.
    This makes the thermostatic trap suited to get rid of large quantities of air and cold condensate at the start-up condition. On the other hand the thermostatic trap will have problems to adapt to the variations common in modulating heat exchangers.

    • intermittent operation
    • fair energy conservation
    • fair resistance to wear
    • good corrosion resistance
    • poor resistance to hydraulic shocks (good for bi-metal traps)
    • do not vent air and CO2 at steam temperature
    • good ability to vent air at very low pressure
    • excellent ability to handle start up air loads
    • excellent operation against back pressure
    • good resistance to damage from freezing
    • good ability to purge system
    • excellent performance on very light loads
    • delayed responsiveness to slugs of condensate
    • fair ability to handle dirt
    • small comparative physical size
    • poor ability to handle flash steam
    • open or closed at mechanical failure depending of the construction

    Float Steam Traps

    In the float steam trap a valve is connected to a float in such a way that a valve opens when the float rises.
    The float steam trap adapts very well to varying conditions as is the best choice for modulating heat exchangers, but the float steam trap is relatively expensive and not very robust against water hammers.

    • continuous operation but may cycle at high pressures
    • no action at no load, continuous at full load
    • good energy conservation
    • good resistance to wear
    • good corrosion resistance
    • poor resistance to hydraulic shocks
    • do not vent air and CO2 at steam temperature
    • excellent ability to vent air at very low pressure
    • excellent ability to handle start up air loads
    • excellent operation against back pressure
    • poor resistance to damage from freezing
    • fair ability to purge system
    • excellent performance on very light loads
    • immediate responsiveness to slugs of condensate
    • poor ability to handle dirt
    • large comparative physical size
    • poor ability to handle flash steam
    • closed at mechanical failure

    Inverted Bucket Steam Trap

    In an inverted bucket steam trap a leverage system multiplies the force provided by the bucket to open a valve against the pressure. The bucket is open at the bottom and robust against water hammers.

    • intermittent operation – condensate drainage is continuous, discharge is intermittent
    • small dribble at no load – may leak steam, intermittent at light and normal load, continuous at full load
    • good energy conservation
    • good resistance to wear
    • good corrosion resistance
    • excellent resistance to hydraulic shocks
    • vents air and CO2 at steam temperature
    • poor ability to vent air at very low pressure
    • fair ability to handle start up air loads
    • excellent operation against back pressure
    • good resistance to damage from freezing
    • good ability to purge system
    • good performance on very light loads – but may leak steam if there almost no condensate load for the bucket to float
    • immediate responsiveness to slugs of condensate
    • excellent ability to handle dirt
    • large comparative physical size
    • fair ability to handle flash steam
    • open at mechanical failure

    Thermodynamic Disc Steam Traps

    The thermodynamic trap is an robust steam trap with simple operation. The trap operates by means of the dynamic effect of flash steam as it passes through the trap.

    • intermittent operation
    • poor energy conservation
    • poor resistance to wear
    • excellent corrosion resistance
    • excellent resistance to hydraulic shocks
    • do not vent air and CO2 at steam temperature
    • not recommended at low pressure operations
    • poor ability to handle start up air loads
    • poor operation against back pressure
    • good resistance to damage from freezing
    • excellent ability to purge system
    • poor performance on very light loads
    • delayed responsiveness to slugs of condensate
    • poor ability to handle dirt
    • small comparative physical size
    • poor ability to handle flash steam
    • open at mechanical failure
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    Jutta TilleryJutta Tillery
    14:34 02 Apr 22
    Excellent customer service, kept us updated throughout the delivery process really looking forward to doing business with Waltan Tools again soon
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    12:02 29 Jun 21
    We have done business with Winnellie Hydraulics on numerous occasions and find them to always be nothing but professional, honest and reliable.Their customer service is excellent and they are always a pleasure to work with. We would highly recommend Winnellie Hydraulics and we look forward to continuing business with Max and the team in the up and coming future.
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    06:23 15 Feb 21
    Winnellie Hydraulics are up most professional and I am always impressed with the service offered and provided. The team at Winnellie Hydraulics are highly skilled, innovative and ever reliable. They continue to be the Territory’s leading service specialists within the fields of the hydraulic and pneumatic services and solutions. The team have a broad range of knowledge in hydraulic, pneumatic, hose management and products across a extensive range of divisions. The team at Winnellie Hydraulics are easy to work with and really appreciate their customers and strive for continuous business improvement.
    Rob NorthRob North
    07:53 10 Feb 21
    Efficient, professional and dedicated. The team at Winnellie Hydraulics are a pleasure to work with and are customer service specialists.Max and the team have taken on many challenges to assist with emergent scopes at our onshore facility in Darwin. They go above and beyond to meet the timeline required without missing a beat on quality.I highly recommend dealing with them and look forward to future business.Thanks guys
    Darren SteeleDarren Steele
    02:59 07 Feb 21
    For all your Hydraulic & Pneumatic needs, Winnellie Hydraulics has you covered.Max and the team run a great operation that supports the Oil & Gas and Mining industries.With great brands supporting them, they are truly the one stop shop for all your engineering needs.
    Dipak NandDipak Nand
    23:06 04 Feb 21
    The team at Winnellie hydraulics, is great to work with, they understand our priority and service delivery to our Defence clients, No job too small or big and delivering of high quality products and service. Also really easy to deal with in regards to faults/ warranty and SME service . Highly recommended to use.
    Darren UptonDarren Upton
    22:54 04 Feb 21
    Winnellie Hydraulics are a Parker PPD for the NT which means they have full access to all Parkers Hannifin products & our local Engineering team in Australia who can work with Winnellie on any projects where clients needs are meet using Parkers products & their insulation experience
    Ben TilbrookBen Tilbrook
    07:35 04 Feb 21
    Outstanding commitment to their customers, in my experience there isn’t anything that is too hard for this mob. Always prepared to find solutions to their customers now matter how big or small the request. A great family business who take pride in providing product and service.
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