Yoshitake DS-2 drain separator is designed to efficiently separate condensate from steam and compressed air systems. Utilizing a cyclone-type internal structure, it generates centrifugal force to remove moisture, which helps prevent thermal efficiency decline, water hammer, and corrosion in valves and piping. The DS-2 features flanged connections and is available in sizes from 15A to 150A, handling maximum pressures up to 2.0 MPa for steam and 1.0 MPa for air.

Also sharing the product family is the DS-1 drain separator, which offers similar performance with JIS Rc screwed connections for sizes 15A to 50A. Both models are virtually maintenance-free due to the absence of moving parts, relying on their flow path geometry to ensure reliable, permanent condensate separation with extremely low pressure loss.

Features

• High Efficient Separation: Effectively separates condensate using a cyclone-type mechanism.
• Low Pressure Loss: Cross-sectional area inside the separator is larger than the piping size, reducing pressure loss to almost zero.
• Maintenance-Free: Trouble-free operation by minimizing the number of moving parts (no moving parts inside).

Problems Caused by Condensate

Failure to properly handle condensate in steam piping and air/gas systems can result in various issues:

• Declined Thermal Efficiency: Condensate reduces the effective heat quantity (latent heat) and steam dryness. It forms a water film on heating surfaces, preventing thermal conduction. Water carried over from boilers also contains impurities that form scale.
• Water Hammer: High-velocity steam carries denser condensate, causing strong impacts on valves and units, leading to damage or erosion.
• Formation of Scale: Rust and scale can form on carbon steel pipes, causing pressure reducing valves and control units to malfunction.
• Air/Gas System Issues: Corrosion from condensate causes strainers and traps to clog.

Structure and Operation

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

INFO

There are no movable parts. The capacity will not change almost permanently, as the design itself makes this performance possible.

Specifications

Model	DS-1	DS-2	DS-2 (150A)
Nominal Size	15A-50A	15A-100A	150A
Application	Steam, Air	Steam, Air	Steam, Air
Maximum Pressure	2.0 MPa (Air: 1.0 MPa or less)	2.0 MPa (Air: 1.0 MPa or less)	1.8 MPa (Air: 1.0 MPa or less)
Maximum Temperature	220°C	220°C	220°C
Body Material	Ductile cast iron	Ductile cast iron	Ductile cast iron
Connection	JIS Rc screwed	JIS 10K/20K FF flanged	JIS 10KFF / 20KRF flanged

Note: For JIS 10KFF and JIS 10KRF flanges, maximum pressure is 1.0 MPa. A gasket is durable for 1 to 2 years when applied to steam.

Structure and Parts

No.	Parts Name	No.	Parts Name
1	Body	5	Bolt
2	Receiver	6	Plug
3	Nozzle	7	Name Plate
4	Gasket	8	Rivet

(DS-2 sizes 15A-100A structure shown. DS-1 uses a similar internal structure with screwed ends. DS-2 150A includes additional parts like a baffle plate and eye bolt.)

Sizing and Flow Velocity

Select a drain separator nominal size equivalent to that of the piping. Using a smaller nominal size increases pressure loss and may cause inadequate pressure at the equipment inlet.

Working Flow Velocity:

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

WARNING

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

Installation and Piping

Installation Guidelines:

• Connect the drain separator horizontally to the piping with the condensate discharge port pointing down.
• Install a trap under the condensate discharge port.
• Ensure the top of the steam trap is lower than the condensate discharge port of the drain separator.
• When installing before a steam pressure reducing valve, ensure a strainer, drain separator, and steam trap are properly installed to prevent scale and condensate problems.
• Remove foreign substances and scales from the pipe before connection. Seal tape or liquid sealant should not flow into the pipe.

Maintenance Space: Reserve adequate space (dimension H3) below the separator for maintenance and inspections.

• 15A-25A: 210 mm
• 32A-40A: 240 mm
• 50A: 290 mm
• 65A: 350 mm
• 80A: 410 mm
• 100A: 550 mm
• 150A: 1000 mm

Maintenance Procedures

Perform a self-inspection once a year to check for abnormalities on the body and receiver, slackness of bolts, and external leakage.

WARNING

Before disassembling or inspecting the product, confirm that internal pressures have been released to the atmosphere and the product has cooled down. Failure to do so may result in injury or burns.

Tightening Torques for Assembly:

• 15A-25A (M8): 30 N·m
• 32A-40A (M8): 35 N·m
• 50A (M8): 45 N·m
• 65A-80A (M10): 80 N·m / 85 N·m
• 100A (M12): 145 N·m
• 150A (M16): 200 N·m

When replacing the gasket, clean the faces of the body and receiver, and apply recommended paste on the gasket before reassembly. Tighten bolts evenly in a diagonal order.