Miyawaki - Μειωτής πίεσης - RE20
Pressure reducing valves (PRV) are designed for regulating the downstream pressure and maintaining it within certain acceptable limits.
Ideally, a PRV should provide a constant downstream pressure while delivering the required flow, i.e.
The PRV automatically adjusts the steam flow to meet the downstream system demand.
Depending on the model, MIYAWAKI’s pressure reducing valves are designed for steam, air, gases and liquids.
Operating principle
Changes in downstream pressure are sensed by the bellows, which expands or contracts depending on the pressure change.
The movement of the bellows will be directly transferred to the spring, which will open or close the main valve, thus keeping the downstream pressure at a certain level.
Suitable for small processes such as sewing, cleaning, food industry, dyeing industry, apparel industry, heating equipment, sterilizer, rubber vulcanizer, medical equipment, bio-related equipment.
Compact and lightweight design allows installation in tight spaces.
(Model RE2 is the world's smallest steam pressure reducing valve)
Pressure Reducing Valves Direct Acting for steam
- Max. Operating Pressure
- 2,2MPa
- Max. Operating Temperature
- 350℃
Features
Self acting pressure reducing valve for steam
This valve reduces the steam supply pressure to a defined outlet pressure and keeps it steady, even under downstream fluctuations . The valves needs no seperate energy source.
Wide range of pressure reduction
Due to carfefully selected springs an outstanding reduction ratio of 25:1 is achieved.
Superb durability
Highly durable and carefully selected components, a 360° free rotating, conical plug and the lack of a sensitive diaphragm ensure outstanding lifetime of this valve.
Operating features of direct acting pressure reducing valves
Pressure changes on the downstream side are detected in the detection chamber, and the degree of opening of the valve is directly adjusted to keep the pressure on the downstream side at set pressure.
Diaphram free design
The valve operates with an O-ring sealing and a piston design. Due to this design, no daiphragm and no external sensing line is required.
Options available
- additional pressure gauges
- tailored connections for special applications
- softsealing for leakage class VI
Typical applications
Perfect for all applications with medium to high steam flow or high reduction. In particuliar power plants, chemical and petrochemical process applications, ships, food and beverage plants, and other similar installations of of compact steam equipment.
Dimensions/Weight
Size (DN) | Dimensions (mm) | Kvs Value | Weight (kg) | ||
| L | H | h | |||
| 15 | 130 | 410 | 82 | 1,8 | 11,4 |
| 20 | 150 | 66 | 3,2 | 11,4 | |
| 25 | 160 | 66 | 5,0 | 12,5 | |
| 32 | 180 | 81 | 7,9 | 14,5 | |
| 40 | 200 | 83 | 13,0 | 16,0 | |
| 50 | 230 | 586 | 100 | 20,0 | 35,0 |
| 65 | 290 | 615 | 113 | 34,0 | 39,5 |
| 80 | 310 | 733 | 140 | 51,0 | 52,5 |
| 100 | 350 | 762 | 154 | 80,0 | 68,0 |
| 125 | 400 | 715 | 210 | 130,0 | 150,0 |
| 150 | 480 | 720 | 235 | 180,0 | 180,0 |
| 200 | 600 | 950 | 285 | 320,0 | 330,0 |
Specifications
Body Material
Ductile cast iron
EN-GJS-400-15
(GGG-40,0.7040)
Body design conditions
| PN16 | |
| Max. design pressure (MPa) PMA | 1,6 |
| Max. design temperature (℃) TMA | 350 |
| Max. operating pressure (MPa) PMO | 1,5 |
| Max. operating temperature (℃) TMO | 350 |
Pressure - Temperature rating
| PN | Temperature ℃ | ||||||
| -10･･･+50 | 100 | 150 | 200 | 250 | 300 | 350 | |
| Pressure MPa | |||||||
| PN16 | 1,6 | 1,6 | 1,6 | 1,5 | 1,4 | 1,3 | 1,1 |
| PN25 | 2,5 | 2,5 | 2,4 | 2,3 | 2,2 | 2,0 | 1,8 |
Secondary pressure ranges
Secondary pressure range | DN15-DN40 | DN50 | DN65 | DN80 | DN100 | DN125-DN200 |
| MPa | Spring number per size | |||||
| 0,05-0,1 | 9 | 28 | 27 | 38 | 37 | On request |
| 0,1-0,16 | 8 | 27 | 26 | 37 | 36 | |
| 0,16-0,25 | 7 | 26 | 25 | 36 | 35 | |
| 0,25-0,4 | 6 | 25 | 24 | 35 | 34 | |
| 0,4-0,63 | 5 | 24 | 23 | 34 | 33 | |
| 0,63-1,0 | 4 | 23 | 22 | 33 | 32 | |
| 1,0-1,6 | 3 | 22 | 21 | 32 | 32 | |
Secondary pressure higher than 1,6 MPa on request
A minimum differential pressure of 0,05 MPa is required.
Steam Flow Rate
