Steam Line

Steam is a very efficient and easily controlled heat transfer medium. It is most often used for transporting energy from a central location to any number of locations in the plant, where it is used to heat air, water or process applications. It is important to get steam to its various users around the plant as efficiently as possible. Efficiency translates into getting steam to the users with minimal loss in latent energy at a reasonable cost. This is where Steam Traps go into action.
A Steam Trap is simply an automatic valve that opens for condensate, air and CO2 and closes for steam. Without steam traps the condensate would form in distribution piping, creating problems.In identifying steam traps we can break them down into three main groups: Thermodynamic, Thermostatic, Mechanical.
In order to manage steam properly, amongst very few others in the world, CDB also supplies forged Piston Manifolds equipped with trap stations and condensate lift pumps to return the condensate back to the boiler for reuse.

Thermodynamic Steam Trap –
Disc Type (TD)

The thermodynamic disc type is probably the simplest trap on the market and yet is the most widely used. The disc trap is made up of three primary components: the body, the cap and the disc. This type of trap is operated by the internal energy of steam. Condensate and air entering the trap raise the disc and flow continuously throughout the discharge orifice. Steam entering the trap expands suddenly as it reaches the underside of the disc. The resulting high flow velocity (kinetics energy) causes a decrease in pressure under the disc  (Bernoulli’s Principle). Steam above the disk is stationary, therefore at higher pressure, forcing the disc onto the seat and closing the trap. When condensate appears at the trap inlet, the steam above the disc condenses releasing the pressure and allowing the discharge cycle to repeat.

Thermostatics Steam Trap –
Balanced Pressure Type (BP)

The operating principle is based on the balance between the steam pressure and the internal pressure of the thermostatic membrane capsule, hermetically sealed and filled with a volatile fluid whose saturation temperature is lower than steam at any pressure. At start up the trap is wide open, freely discharging air, non-condensable gases and cool condensate. When the steam reaches saturation temperature, vaporization of the liquid inside the capsule creates a pressure differential which will shut the discharge orifice thus preventing any steam loss. When condensate inside the trap cools, the vaporized filling inside the capsule condenses thus reducing the internal pressure allowing the opening of the trap for discharge again.

Thermostatic Steam Trap –
Bi-Metallic Type (BM)

The bi-metallic trap operates under the principle of thermal expansion of metals. Two dissimilar metals are joined into a series of discs and upon heating will deflect to provide movement to close off the valve. When cold condensate and air are present, the bi-metallic elements are flat and the trap remains open discharging condensate and air from the system. When steam approaches the trap, condensate temperature increases making the bi-metallic elements expand until the valve closes and stops discharging. When the condensate reaches the set subcooling the trap will open again.

Mechanical Steam Trap –
Float + Thermostatic Type (FT)

Float and thermostatics steam traps provide immediate and continuous discharge of condensate, air and non-condensable from a steam system as soon as they reach the trap. The float element is normally a ball type, connected by a lever assembly to the main valve head. As condensate reaches the trap the ball float rises positioning the valve to discharge the condensate at the same rate as it reaches the trap. The response is immediate and the discharge fully modulating and continuous. The condensate level is always maintained above the main valve providing a positive water seal which prevents any steam leakage. The internal thermostatic air vent unit immediately discharges all air and non-condensable gases that reach the trap. This assures maximum condensate capacity through the main valves at all times.

Mechanical Steam Trap –
Inverted Bucket Type (IB)

The inverted bucket traps respond to the difference in density between steam and condensate and operate on the principal of an inverted water glass (the component referred to as the bucket). The inverted bucket is attached on the valve head by a lever mechanism and operated to open and close the trap. On start-up the bucket, by its own weight, rests on the trap bottom and the valve is open discharging air and non-condensable. When reaching the trap, condensate makes the bucket float (because of air inside) and rise until it closes the discharge orifice. A small hole in the top of the bucket allows air vent and let condensate in until the bucket slowly sinks to the trap bottom opening the valve. Condensate is discharged until steam enters the trap filling the bucket which rises and closes the trap. Steam will be vented through the hole in the bucket and the cycle is repeated providing an intermittent type discharge.


Amongst few others in the world CDB manufacture Forged Piston Manifolds 100% made in CDB. The compact size reduces installation space for steam traps and isolation valves into one system. Steam and condensate manifolds assure significant benefits to plant operations and maintenance. Properly sized they can increase the efficiency and reliability of the overall steam system. To minimize radiated heat losses, insulation jackets can be provided and can assure significant savings.

Trap Stations and Universal
Connection Steam Traps

Forged Trap Stations, 100% made in CDB, have been designed in order to satisfy the needs of modern process industries, simplifying installation and reducing maintenance time. Its installation eliminates procurement and assembly of many individual components, provides improved capability to check traps operation and a built-in method to block and bleed traps. CDB trap stations can be installed with the complete range of CDB universal connections steam traps.

Lift Pumps

CDB’s Condensate Lift Pumps are non-motorized pumps which return condensate back to the boiler using steam pressure as the motive force. Condensate lift pump supplied as stand-alone units will include a pump tank, internal operating mechanism and a set of inlet and outlet check valves.

Lift Systems

Turn key Condensate lift packaged systems are supplied fully customized with the number of pumps required to meet the required condensate load. In order to collect condensate from the recovery lines and send it to the pumps, a vented receiver tank is mounted on a common base along with all the necessary valves and ancillaries such as y strainer, sight glasses (all fully manufactured by CDB)