Standard code

standard name

Standard code

standard name

JB/T 9093-1999

Technical requirements for steam traps

BS 6023-1981

Steam Trap Terminology

GB/T 12248-1989

Steam Trap Terminology

BS 6024-1981

Steam Trap Marking

GB/T 12249-1989

Steam Trap Marking

BS 6025-1982

Steam Trap Factory Inspection and Working Characteristics Test

GB/T 12250-1989

Steam Trap Structure Length

BS 6026-1981

Flange connection steam trap structure length

GB/T 12251-1989

Steam Trap Test Methods

ISO 6552-1991

Automatic Steam Trap Terminology

GB/T 12247-1989

Steam Trap Classification

ISO 6553-1991

Automatic steam trap symbol

ASTM F1139-1988

Steam Traps

ISO 6554-1991

Flange connection automatic steam trap structure length

BS 6022-1983

Steam Trap Classification

ISO 6948-1981

Automatic steam trap factory inspection and working characteristics test

ISO 6704-1991

Automatic Steam Trap Classification

BS EN26948-1991

Method for measuring steam loss of steam trap

ISO 7841-1991

Method for measuring steam leakage of automatic steam trap

BS EN27841-1991

Steam Trap Testing

ISO 7842-1988

Method for measuring the discharge volume of automatic steam trap

FC185-1-1989

Steam Trap Product Testing

JIS B8401-1989

Steam Traps

NF E29444-1984

Automatic Steam Trap Steam Leakage Test

JIS B8402-1988

Radiator trap for heating

The structure of steam trap

type

name

Structural features

Mechanical

Automatic deflation free float

The spherical closed float (float) is both an opening and closing component and a liquid level sensor. When the liquid level rises, the float rises and the valve opens; when the liquid level drops, the float drops and the float approaches the valve seat with the flow of the medium, closing the valve. An automatic exhaust valve is installed on the top of the valve

Mechanical

Manual deflation free float type

The spherical closed float (float) is both an opening and closing component and a liquid level sensitive component. When the liquid level rises, the float rises and the valve opens; when the liquid level drops, the float drops and the float approaches the valve seat with the flow of the medium. A manual exhaust valve is installed on the top of the closing valve.

Mechanical

Automatic deflation free float

The spherical closed float (float) is both an opening and closing component and a liquid level sensor. When the liquid level rises, the float rises and the valve opens; when the liquid level drops, the float drops and the float approaches the valve seat with the flow of the medium, closing the valve. The automatic exhaust valve is placed on the outlet side.

Mechanical

Free float valve

The spherical closed float (float) is both an opening and closing component and a liquid level sensor. When the liquid level rises, the float rises and the valve opens; when the liquid level drops, the float drops and the float approaches the valve seat with the flow of the medium, closing the valve. The automatic exhaust valve is simplified to a thermal bimetallic element.

Mechanical

Lever float type

The liquid level sensor, action transmission element and action actuator are the float, lever and valve disc. The setting of the lever increases the opening and closing force of the valve disc.

Mechanical

Double valve seat lever float type

The double valve disc setting offsets the force of the medium, so that the opening and closing of the valve disc is not affected by the medium pressure. The automatic exhaust valve is placed at the outlet of the valve.

Mechanical

Open upward float type

The liquid level sensor opens upward (floating barrel), and the valve is opened and closed by the change of buoyancy. The valve outlet is placed above the valve.

Mechanical

Lever open upward float type

Compared with the open upward float type, a lever is installed to increase the opening and closing force of the valve disc.

Mechanical

Piston open upward float type

A pilot valve is added on the basis of the open upward float type. After the pilot valve is opened, the main valve is opened with the help of the medium pressure.

Mechanical

Free semi-floating ball

The liquid level sensitive part opens downward (half float), and is also the actuator (valve flap). When the half float floats up, it can freely approach the valve seat, and the thermal bimetallic element automatically removes the cold air.

Mechanical

Lever open downward float type

Compared with the free semi-floating ball type, a lever is added to increase the opening and closing force of the valve.

Mechanical

Piston lever open downward float type

Compared with the lever open downward float type, a pilot valve is added. The function of the pilot valve is the same as that of the piston float type.

Thermostatic

Diaphragm box type

The main component is a metal diaphragm box filled with temperature-sensitive liquid. Different temperature-sensitive liquids are selected according to different working conditions. When the diaphragm box is exposed to steam and condensed water at different temperatures, the temperature-sensitive liquid undergoes a state change between steam and liquid, resulting in pressure rise or fall, causing the diaphragm to drive the valve disc to move back and forth, opening and closing the valve to achieve the purpose of steam blocking and water drainage.

Thermostatic

Diaphragm

The principle is the same as above. A high temperature resistant membrane is provided between the lower body and the upper cover of the valve. The bowl under the membrane is filled with temperature sensitive liquid.

Thermostatic

Bellows

The bellows filled with temperature-sensitive liquid is used as a thermal element. When the temperature changes, the vapor pressure of the temperature-sensitive liquid in the bellows also changes, causing the bellows to stretch or contract, driving the valve disc connected to the bellows to operate.

Thermostatic

Simply supported beam bimetallic

A set of bimetallic components installed in the form of a simply supported beam acts as a thermal element, which bends or straightens as the temperature changes, pushing the valve disc

Thermostatic

Cantilever beam bimetallic strip

The principle is the same as the previous set of bimetallic strips installed in the form of a cantilever beam

Thermostatic

Single bimetallic disc

The principle is the same as above, with a C-shaped bimetallic element as the thermal element

Thermal power type

Disc

The valve plate is both a sensitive part and an actuator. It is driven by the different thermodynamic properties of steam and condensed water when they pass through to open and close the air between the inner and outer valve covers. The valve can be installed horizontally or vertically.

Thermal power type

Pulse

The valve disc of this valve is relatively long. The valve disc is placed in the cylinder with a certain gap between it and the cylinder, which is called the first throttle hole. There is a through hole on the flange at the upper end of the valve disc, which is called the second throttle hole. At the beginning of startup, the incoming air is discharged through the two throttle holes. When condensate enters the steam trap, the valve disc is pushed upward under the action of the condensate, opening the outlet and discharging the condensate. When the condensate is discharged and steam enters, the pressure drop of the steam at the first flow hole is less than the pressure drop of the condensate, and the pressure in the structural control room increases, pushing the valve disc down to close the valve seat hole. Even when the steam trap with this structure is in the closed state, its inlet and outlet are always connected through the two throttle holes, so the steam trap is always in an incompletely cut-off state.

Thermal power type

Orifice plate

According to different displacement, the purpose can be achieved by selecting orifice plates with different apertures. The structure is simple, but the steam leakage is high if the orifice plates are not selected properly.

Compound

Bellows Pulse

A pilot valve is added on the basis of the pulse type. The pilot valve is driven by a thermal element (bellows). The setting of the pilot valve reduces steam leakage.

Compound

Bellows lever float type

A bellows is added on the basis of the lever float, so that the fulcrum of the lever moves with the expansion and contraction of the bellows, which is conducive to the discharge of cold air.