Yoshitake DS-1 drain separator effectively separates condensate from steam and air piping systems with the aid of centrifugal force generated by its internal passage configuration. Condensate in steam and air piping can cause a decline in thermal efficiency, water hammer, and corrosion of devices, valves, and pipes. Using the DS-1 helps prevent these issues. In normal conditions, use a separator of the same nominal size as the piping for both steam and compressed air systems. Note: While this page focuses on the DS-1, much of the technical information also applies to the related DS-2 flanged model.

Features

• Cyclone Type: High efficient drain separation due to cyclone type.
• Low Pressure Loss: Extremely low pressure loss because the sectional area inside the separator is larger than the piping size.
• Maintenance-Free: Trouble-free operation by minimizing the number of moving parts. The capacity will not change almost permanently.

Structure and Operation

When steam or air flows into the drain separator, centrifugal force is generated by the internal structure of the body. Condensate swirls along the wall surface due to the difference in specific gravity between it and the steam/air, and strikes against the baffle. The condensate is then guided to the discharge port, while clean and dry steam or air flows to the outlet side through the nozzle.

Specifications

Specification	Value
Model	DS-1
Size	15A–50A
Application	Steam, Air
Maximum pressure	2.0 MPa (Less than 1.0 MPa for air)
Maximum temperature	220°C
Body Material	Ductile cast iron
Nozzle Material	Cast iron
Receiver Material	Ductile cast iron
Connection	JIS Rc screwed

Dimensions and Weights

Nominal Size	d	L (mm)	H (mm)	H1 (mm)	d0	Weight (kg)
15A	Rc 1/2	150	243	193	Rc 3/4	7.1
20A	Rc 3/4	150	243	193	Rc 3/4	7.1
25A	Rc 1	150	243	193	Rc 3/4	7.3
32A	Rc 1 1/4	190	282	213	Rc 1	12.5
40A	Rc 1 1/2	190	282	213	Rc 1	12.5
50A	Rc 2	219	342	260	Rc 1	20.5

Selecting a Nominal Size

Select a nominal size equivalent to that of the pipe (piping nominal size = nominal size of drain separator). Using a drain separator of a smaller nominal size may increase pressure loss, resulting in failure to keep the specified pressure at the outlet of a unit.

Maximum Working Flow Velocity:

• Steam: 30 m/sec or less
• Air: 15 m/sec or less

Note on Flow Velocity

Keep the fluid below the specified flow velocity. A higher flow velocity may cause condensate separation to fail.

Installation Guidelines

• Check the direction of the fluid and the inlet/outlet directions of the drain separator in advance.
• Connect the drain separator horizontally to piping with the condensate discharge port facing down.
• Securely support the product and the piping.
• Be sure to install a trap under the drain discharge port.
• Install the trap so that its upper end (top cover) is lower than the condensate discharge port of the drain separator.
• When installing, secure the space of dimension H3 (210 mm for 15A–25A; 240 mm for 32A–40A; 290 mm for 50A) required for maintenance and inspections.
• Make sure to install a strainer, drain separator, and steam trap in front of any steam pressure reducing valve.

Gasket Replacement

When using model DS-1 for steam applications, it is recommended to replace the gasket after 1 to 2 years as a guide.