Miyawaki - Pressure reducing valve - Direct Acting for steam - REC1
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)
- Max. Operating Pressure
- 1,6MPa
- Max. Operating Temperature
- 220℃
Features
Self acting pressure reducing valve for steam
Automatic valve that reduces the steam supply pressure to a defined set pressure.
Pressure fluctuations on upstream side are followed by the downstream side.
No external energy required
Compact and cost effective design
Can be installed in tight spaces thanks to its compact design (small/lightweight). Offers reliable operation, energy saving, and productivity improvement.
Easy handling
Pressure can easily adjusted by the topside handle.
Operating features of direct acting pressure reducing valves
Downstream pressure changes are detected in the detection chamber, and the degree of opening of the valve is directly adjusted to maintain the set pressure.
Superb durability
Most of materials are made from stainless steel, making it durable and corrosion-resistant.
Typical applications
Suitable for F&B equipment, medical equipment, bio-related equipment, and other compact steam equipments.
Dimensions/Weight
Screwed
| Size | Dimensions (mm) | Dimensions (in) | Weight | |||||||
| L | H1 | H2 | W | L | H1 | H2 | W | (kg) | (lb) | |
| 1/2” | 96 | 138 | 63 | 78 | 3.8 | 5.4 | 2.5 | 3.1 | 2,9 | 6.4 |
| 3/4” | 2,8 | 6.2 | ||||||||
| 1” | ||||||||||
Flanged
| Size | Dimensions (mm) | Dimensions (in) | Weight (kg) | Weight (lb) | ||||||||||||
| L | H1 | H2 | W | L | H1 | H2 | W | JIS(FF,RF) | ASME/JPI(RF) | JIS(FF,RF) | ASME/JPI(RF) | |||||
| 10K,16K | 20K | 150lb | 300lb | 10K,16K | 20K | 150lb | 300lb | |||||||||
| 1/2” | 150 | 138 | 63 | 78 | 5.9 | 5.4 | 2.5 | 3.1 | 4,2 | 4,4 | 3,9 | 4,3 | 9.3 | 9.7 | 8.6 | 9.5 |
| 3/4” | 4,5 | 4,7 | 4,3 | 5,3 | 9.9 | 10.4 | 9.5 | 11.7 | ||||||||
| 1” | 160 | 6.3 | 5,7 | 6,1 | 5,1 | 6,1 | 12.6 | 13.5 | 11.3 | 13.5 | ||||||
Specifications
| Model | Connection | Max. operating pressure | operating pressure range | Control pressure range | Max. pressure reduction ratio | Max.operating temperature | Body material | |||||
| Type | Size | (MPa) | (psig) | Primary side pressure (MPa) | Primary side pressure (psig) | Secondary side pressure (MPa) | Secondary side pressure (psig) | (℃) | (℉) | |||
| REC1-2 | Screwed Rc, Rp, NPT | 1/2” | 1,6 | 230 | 0,2 - 1,6 | 29 - 230 | 0,02 - 0,2 | 2.9 - 29 | 30：1 | 220 | 428 | Stainless steel SCS14 |
| 3/4” | ||||||||||||
| 1” | ||||||||||||
| REC1-6 | 1/2” | 0,2 - 1,6 | 29 - 230 | 0,18 - 0,6 | 26 - 87 | 8.9：1 | ||||||
| 3/4” | ||||||||||||
| 1” | ||||||||||||
| REC1-10 | 1/2” | 0,6 - 1,6 | 87 - 230 | 0,54 - 1,0 | 78 - 145 | 3：1 | ||||||
| 3/4” | ||||||||||||
| 1” | ||||||||||||
| REC1-2F | Flanged (FF,RF) | 1/2” | 0,2 - 1,6 | 29 - 230 | 0,02 - 0,2 | 2.9 - 29 | 30：1 | |||||
| 3/4” | ||||||||||||
| 1” | ||||||||||||
| REC1-6F | 1/2” | 0,2 - 1,6 | 29 - 230 | 0,18 - 0,6 | 26 - 87 | 8.9：1 | ||||||
| 3/4” | ||||||||||||
| 1” | ||||||||||||
| REC1-10F | 1/2” | 0,6 - 1,6 | 87 - 230 | 0,54 - 1,0 | 78.- 145 | 3：1 | ||||||
| 3/4” | ||||||||||||
| 1” | ||||||||||||
● Minimum differential pressure: 10% of the primary side
● Minimum adjustable flow rate: 3 to 30kg/h (6.6 to 66 lb/h)
● Lockup pressure: Up to 0,03MPa (4.4psig)
● Offset
Up to 60% of the secondary side when secondary side pressure is 0,1MPa (14.5psig) or lower
Up to 0,07MPa (10.2psig) when secondary side pressure exceeds 0,1MPa (14.5psig) but is less than 0,6MPa (87psig)
Up to 0,1MPa (14.5psig) when secondary side pressure is 0,6MPa (87psig)
Capacity Chart
● How to use selection chart (example)
To reduce the pressure of 100kg/h (220lb/h) of steam from 1,0MPa to 0,5MPa (145psig to 73psig)
1. Find the point at which the primary side pressure 1,0MPa (145psig) curve and secondary side pressure 0,5MPa (73psig) horizontal line intersect.
2. Trace a vertical line from the point where they intersect, and look for the smallest-sized product where the steam flow rate is 100kg/h (220lb/h) or more at the point where the vertical line you have traced intersects the horizontal size lines.
3. In this case, the REC1-6(F) pressure reducing valve with a size of 15A (1/2”) is optimum.
