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MIYAWAKI Steam Traps – Complete Series Guide for Industrial Efficiency

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Introduction

For process engineers and procurement teams, condensate management directly affects safety, energy cost, and uptime. Miyawaki Steam Traps deliver proven Japanese engineering for reliable condensate removal across utilities, tracing, sterilization, and high‑pressure process lines. This guide summarizes the full portfolio—Series E, G, D, TB, W, S, plus Two‑Bolt Connection type—to help you specify the right trap for new builds or retrofits.


Various Miyawaki steam traps, including inverted bucket, temperature control, and diaphragm types, displayed on a light background.
Explore Miyawaki Steam Traps: Precision-engineered Series E, G, D, TB, W, S, and Two-Bolt types for superior efficiency, reliability, and maintenance ease. Japanese innovation at its finest.

Why choose MIYAWAKI Steam Traps:

  • Precision & Reliability: Robust internals and proven mechanisms designed for continuous duty in demanding steam systems.

  • Energy Performance: Fast air/condensate removal minimizes start‑up lag and reduces steam loss.

  • Range Coverage: From low‑pressure radiators to extra‑high pressure main lines and superheated steam applications.

  • Maintainability: Options like integrated bypass valves and a Two‑Bolt Connection design simplify inspection and replacement.

Product Lineup Overview

Series E – Inverted Bucket Steam Traps

Best for: General process equipment, drip points, and medium/high‑pressure lines requiring durable, dirt‑resistant operation.

  • Operating principle: Uses the density difference between steam and condensate; an open “bucket” float operates the valve for dependable on/off discharge.

  • Key strengths:

    • SCCV (Self‑Closing & Centering Valve) design for long life and tight shut‑off.

    • ER high‑discharge variants achieve large capacities in compact bodies.

  • Representative models/capabilities: ES/ER families with maximum operating pressures up to 6.4 MPa and temperatures up to 425 °C, with capacities from hundreds of kg/h to multiple t/h.

Series G – Ball Float Steam Traps

Best for: Continuous condensate loads at near‑constant pressure—heat exchangers, unit heaters, reboilers.

  • Operating principle: Airtight ball float modulates the valve; options include lever‑float and lever‑free designs.

  • Key strengths:

    • Double‑ported balance valve options enable high discharge with compact floats.

    • Broad pressure/temperature range for utility and process duties.

  • Representative models/capabilities: Examples span up to 15.0 MPa and up to 550 °C, with discharge capacities from ~0.2 t/h to >50 t/h depending on model.

Series TB – Temperature Control (Thermostatic) Steam Traps

Best for: Steam tracing lines and temperature‑critical condensate control; also suitable for selected main steam applications.

  • Operating principle: Thermosensitive element expands/contracts based on set temperature; pre‑settable operation temperature for energy‑saving tracing.

  • Key strengths:

    • Proven reliability in global process industries.

    • Sturdy internals withstand pressure shocks and superheat (model‑dependent).

  • Representative models/capabilities: Typical operating pressures up to 2.1 MPa, temperatures up to 350 °C, and capacities up to ~0.94 t/h.

Series D – Diaphragm (Balanced Pressure) Steam Traps

Best for: Sterilizers, sanitary equipment, and compact installations where corrosion resistance and small footprints are critical.

  • Operating principle: Thermoelement/diathermic capsule actuates a diaphragm with a controlled sub‑cooling setpoint (e.g., ~5 °C or ~15 °C below saturation depending on element type).

  • Key strengths:

    • Many stainless steel constructions for cleanability and corrosion resistance.

    • Models with built‑in bypass valves reduce external piping and installation time/cost.

  • Representative models/capabilities: Operating pressures typically 0.5–2.1 MPa, temperatures up to 235 °C, and capacities up to ~0.7 t/h.

Series W – Thermoelement (Wax‑Type) Steam Traps

Best for: Low‑pressure, small‑scale systems such as radiators and tracing on small lines.

  • Operating principle: Wax expansion/contraction opens/closes the valve as temperature changes.

  • Representative models/capabilities: Operating pressures around 0.3 MPa, temperatures up to 150 °C, and capacities up to ~0.72 t/h.

Series S – Thermodynamic Disc Steam Traps

Best for: Drip legs and distribution lines where simplicity, compactness, and orientation‑free installation are desired.

  • Operating principle: Utilizes hydrodynamic/thermodynamic effects from flow velocity differences to open/close the disc.

  • Key strengths:

    • Any orientation installation; rugged design for outdoor networks.

    • Select models include a built‑in bypass valve to eliminate separate bypass piping.

  • Representative models/capabilities: Operating pressures up to 1.6 MPa (typical), temperatures up to 220 °C, and capacities from hundreds of kg/h to ~1.7 t/h.

Two‑Bolt Connection Type – Fast, Safe Replacement

Best for: High‑throughput maintenance programs and retrofit projects needing minimal downtime.

  • Design highlights:

    • All‑stainless body & internals for durability.

    • Horizontal or vertical installation.

    • Two‑Bolt cartridge‑style interface for quick swap‑outs without reworking pipe unions.

  • Representative models/capabilities: Examples include DC1‑21U (2.1 MPa / 220 °C / 660 kg/h) and SU2‑32U (3.2 MPa / 350 °C / 680 kg/h).

Selection Guide

Match each application to the optimal MIYAWAKI Steam Trap:

  • Steam tracing / small lines: Series TB (temperature‑settable), Series W (low‑pressure, wax‑type).

  • Heat exchangers / continuous loads: Series G (ball float) for modulating discharge.

  • General process / dirt‑prone lines: Series E (inverted bucket) for robust on/off action and dirt handling.

  • Sterilizers / sanitary equipment: Series D (diaphragm) with stainless construction and optional built‑in bypass.

  • Drip legs / distribution: Series S (disc) for compactness and universal mounting.

  • Rapid maintenance programs: Two‑Bolt Connection types for quick changeover.

Typical Benefits for Plant Operations

  • Lower energy loss through proper air/condensate removal and tight shut‑off.

  • Higher uptime via robust mechanisms and simplified maintenance designs.

  • Safety & quality from stable steam temperature and reduced water‑hammer risk.

Specifications & Materials (Summary)

  • Body/Internals: Broad use of stainless steel across series for corrosion resistance and hygiene.

  • Operating Envelope: Model‑dependent pressure/temperature ranges from 0.3 MPa / 150 °C (low‑pressure radiators) up to 15.0 MPa / 550 °C (special high‑pressure ball‑float models).

  • Connections: Threaded, flanged, and Two‑Bolt cartridge‑style options to suit site standards.


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