Thermostatic trap valves open and close with the expansion and contraction of temperature-sensitive elements. These traps operate on the difference in temperature between steam, the cooler condensate and air.
Balanced pressure steam traps open and close via the expansion and contraction of temperature-sensitive elements that respond to the lower temperatures created by the condensate and noncondensable gases in the trap. The operating unit within the trap, a pressure-balanced disc or bellows, is filled with a liquid having a saturation temperature slightly below that of water.
Pinch traps use self-regulating action. The pinching modulator begins to automatically close off flow as the wax around the modulator expands with the passage of hot condensate. As the condensate builds up and cools, the wax around the modulator contracts allowing the orifice to open and create flow.
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Float and thermostatic traps (F&T) are used for draining steam equipment and as drip traps. As the name implies this trap is a combination of two separate devices, a float trap and a thermostatic vent. It consists of a chamber with a discharge valve at the bottom. The valve is actuated by a float and lever. The float is usually spherical in shape to resist the pressure of the steam. The thermostatic vent remains open until the trap heats up. It vents allow a large amount of air to pass. A variation of this trap has been called a variable orifice trap. This trap has a free-floating float that acts as the closing mechanism.
A bucket trap is built around a floating bucket that has its open side facing downward. Steam entering the trap is fed into the bucket causing it to float to the top of the surrounding pool of condensate and close the discharge valve. When only condensate enters the trap, the steam in the bucket condenses and the bucket sinks, opening the discharge valve.
A variable orifice trap is a combination of two separate devices, a float trap and a thermostatic vent. It consists of a chamber with a discharge orifice at the bottom. The float responds to the amount of condensate and rises and lowers. When it rises it opens the entry to the orifice and allows condensate drainage.
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Disc traps are used as drip traps for low steam loads, such as steam tracing lines. Disc traps consist of a flat disc resting on a smaller circular seat. The disc is enclosed in a chamber above the seat were it moves around freely. Condensate or steam enters the trap through the center of the seat, flows over the seat, and discharges through ports located under the perimeter of the disc. When condensate is present, it lifts the disc and exits. When steam enters the trap, the trap snaps shut.
Orifice traps are simply holes between the steam main and the condensate system. Orifice traps are sized such that they release as much condensate as enters from the load. There are no mechanical parts to fail. These traps can only be used in applications with a constant load. If the load decreases, the liquid seal is lost and steam passes through the orifice. If the load increases, the orifice will be undersized and the condensate will back up into the equipment.
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Other unlisted, specialized, or proprietary steam traps.
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Traps that can handle the added temperature encountered in superheat applications. Superheated steam is the temperature of steam above the saturated steam temperature.
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These traps are designed specifically for radiator applications. They are usually thermostatic type steam traps and operate on the difference in temperature between steam, cooled condensate and air.
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Other unlisted, specialized or proprietary connection type.
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Brass comes with good strength, excellent high temperature ductility and reasonable cold ductility, good conductivity, excellent corrosion resistance, good bearing properties and low magnetic permeability.
The term "cast iron" refers not to a single material, but to a family of materials whose major constituent is iron, with important trace amounts of carbon and silicon. Cast irons are natural composite materials whose properties are determined by their microstructures - the stable and metastable phases formed during solidification or subsequent heat treatment. The major micro structural constituents of cast irons are: the chemical and morphological forms taken by carbon, and the continuous metal matrix in which the carbon and/or carbide are dispersed.
Ductile iron retains cast iron's machinability and corrosion-resistance, and provides additional strength, toughness, and ductility. Although its chemical properties are similar to those of cast iron, ductile iron incorporates significant casting refinements, additional metallurgical processes, and superior quality control.
A forged iron that contains carbon in any amount up to about 1.7 percent as an essential alloying constituent. It is malleable when under suitable conditions, and is distinguished from cast iron by its malleability and lower carbon content.
Other unlisted, specialized or proprietary material.
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