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GESTRA UNA 45

Description

GESTRA UNA 45 hl Ball Float Steam Trap is a high-performance valve product from GESTRA, part of Spirax Sarco Group, designed for condensate drainage in steam systems, compressed air, and gas mixtures. The valve uses advanced low-friction rolling-ball sealing technology to ensure maximum tightness and durability. It is suitable for high-capacity condensate drainage applications and is not affected by back pressure. As the horizontal left-flow variant of UNA 45 series (hl means horizontal left), it is widely used in industrial steam systems, chemical processing, and energy applications, providing reliable automatic drainage to prevent steam loss and condensate accumulation.

Product Features

  • Excellent sealing performance: Equipped with a rolling-ball sealing unit and ball float control to ensure tight shutoff, prevent steam leakage, and improve system efficiency.

  • Corrosion and fouling resistance: Materials are selected for resistance to chemical corrosion and suitability for various fluid environments, reducing maintenance requirements.

  • Automatic venting function: DUPLEX control unit integrates GESTRA 5N2 diaphragm regulator capsules for temperature-dependent automatic venting. It is suitable for saturated steam systems (superheated steam not exceeding 5 K).

  • Flexible configuration: Supports SIMPLEX (manual venting), SIMPLEX-P (Perbunan rolling ball, for DN 15-25), and internal bypass options. Suitable for condensate, distillate, or rotary cylinder drainage.

  • Optional accessories: Available accessories include a manual lifting lever, manual vent valve, internal strainer, sight glass cover, electrode mounting cover, and Smart Ready function to improve operating convenience.

  • Broad applicability: Not affected by back pressure, suitable for Group 2 fluids under the European Pressure Equipment Directive, and free from inherent ignition sources (ATEX compatible) for safe operation.

Technical Specifications

  • Pressure rating: PN 40 / Class 300, with maximum differential pressure (ΔPMX) of 2-32 bar (29-465 psi) depending on orifice size (AO 2-32).

  • Nominal size: DN 15, 20, 25, 40, 50, 65 (NPS ½”-2½”), with multiple connection options including flanged, threaded, socket-weld, and butt-weld connections.

  • Temperature range: Up to 350°C, depending on pressure and control unit. DUPLEX is suitable for saturated steam +5 K, while SIMPLEX-P is rated up to 40°C.

  • Capacity performance: Maximum hot condensate capacity exceeds 10,000 kg/h, depending on differential pressure and size. Cold water capacity is 1-1.53 times the hot capacity. Refer to the official data sheet for detailed capacity charts.

  • Example dimensions and weights (standard cover, flanged PN 40):

Nominal Size (DN)Length L (mm)Width W (mm)Height H (mm)Weight (kg)
151501711506.8
201602132589.7
252301862588.5
4023021325811.0
5023021325812.0
6529026329028.0
(Sight glass cover increases width to 333 mm and weight by 1-2 kg.)

Materials

  • Body: 1.0460 (EN) / SA105 (ASME/ASTM), providing excellent strength and pressure resistance.

  • Cover and accessories: 5.3103 (EN) / A395 (ASME/ASTM), with a corrosion-resistant design.

  • Gasket: Graphite/CrNi for reliable sealing.

  • Diaphragm regulator capsule: Hastelloy/stainless steel for high-temperature applications.

  • Other components: Stainless steel for long-term durability. All materials comply with EN and ASME/ASTM standards and are suitable for corrosive fluids, subject to chemical compatibility limits.

Applications

GESTRA UNA 45 hl Steam Trap is ideal for industrial steam system optimization, chemical condensate drainage, energy equipment drainage, and compressed air systems. It provides condensate drainage without steam loss and is suitable for high-capacity applications such as saturated steam pipelines, rotary cylinders, and distillation equipment. Simple to install, it supports adjustment for horizontal or vertical positions and is suitable for potentially explosive atmospheres when appropriate antistatic measures are implemented. For steam system valve selection, it provides an efficient and reliable solution that helps reduce energy consumption and maintenance costs.

Installation and Maintenance Guide

  • Installation: Install in horizontal piping and ensure that the flow arrow matches the flow direction (hl indicates left flow), with the nameplate facing upward. Tighten using a torque wrench (cover screws 35-140 Nm). Provide sufficient maintenance clearance (S=150-240 mm).

  • Maintenance: Clean the internals regularly using water or a suitable cleaning agent, and replace gaskets and control units as needed. Use VAPOPHONE® or TRAPTEST® to check operation. Troubleshooting: if leakage occurs, inspect for fouling or damaged components.

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