Pressure reducing valve - With Pulse line for steam - REH20L | Miyawaki

Miyawaki REH20L Steam Pressure Reducing Valve with Impulse Line

The Miyawaki REH20L is a direct-acting steam pressure reducing valve featuring an external sensing line on the downstream side. The downstream pressure is directed to the sensing chamber, directly adjusting the valve opening to maintain the outlet pressure according to the mechanical set point of the spring.

Technical Data

• DN15–DN200.
• Body: cast steel GP240GH / GS-C25 / 1.0619.
• Operating medium: saturated or superheated steam, within permissible pressure-temperature diagram.
• Maximum operating temperature TMO: 400°C.
• Maximum operating pressure range: up to 6.4 MPa, depending on execution.
• Kvs: 8.0 to 483 m³/h, depending on DN.
• Downstream pressure setting ranges: 0.05–1.0 MPa typically, with special settings below 0.05 MPa or above 1.6 MPa upon request.
• Maximum pressure reduction ratio: 25:1.

Selection and Application

The REH20L is applied in steam pressure reduction stations where measuring the actual usage pressure post-valve is required. The impulse line is beneficial when there are downstream losses, diameter changes, or distance between the valve and the consumer.

Typical applications:

• compact steam equipment,
• cleaning systems,
• food processing thermal equipment,
• local pressure reductions in industrial steam networks.

Difference from RE20L and REH20L-M

Compared to the RE20L, the REH20L covers higher pressure and temperature operations. The REH20L-M version is intended for even higher temperatures, up to 530°C, and is considered when steam conditions exceed the limits of the REH20L.

Sizing Considerations

For size selection, p1, p2, steam flow rate, temperature, line DN, Kvs, permissible noise, and reduction ratio are required. If the reduction ratio exceeds 25:1, the reduction should be considered in two stages.