Pressure reducing valve - Direct Acting for steam - RE20 | Miyawaki

Name: Pressure reducing valve - Direct Acting for steam - RE20 | Miyawaki
Brand: Miyawaki
SKU: Pressure reducing valve - Direct Acting for steam - RE20 | Miyawaki

Miyawaki RE20 Direct-Acting Pressure Reducing Valve for Steam

The Miyawaki RE20 is a self-operated pressure reducing valve for steam, requiring no external impulse line or auxiliary energy. The downstream pressure is detected in the valve's control chamber, and the cone position adjusts directly to maintain the outlet pressure near the set point. The construction features a piston-operated design with an O-ring, eliminating the need for a diaphragm.

Technical Specifications

DN15–DN200.
Flanged connection, DIN standard.
Body material: ductile cast iron EN-GJS-400-15 / GGG-40.
Body classes: PN16 and PN25.
PMO: 1.5 MPa for PN16.
TMO: up to 350°C.
Kvs: 1.8–320 m³/h, depending on DN.
Downstream pressure settings: 0.05–1.6 MPa, with higher secondary pressure upon technical review.
Minimum differential pressure: 0.05 MPa.
Maximum pressure reduction ratio: 25:1.

Construction and Sealing

The valve employs a 360° rotating conical plug and piston-operated control mechanism. Optional features include additional gauges, special connections, and soft sealing for leakage class VI, where lower seat leakage is required.

Applications

The RE20 is used in medium to high steam flow applications and in scenarios with high pressure reduction ratios. Typical installation sites include power plants, chemical and petrochemical processes, ships, food/beverage units, and compact steam equipment.

Selection and Sizing

Selection should not be based solely on pipe DN. Required parameters include inlet pressure, desired outlet pressure, steam flow rate, temperature, Kvs, flange PN, and leakage requirements. For reduction ratios above 25:1, consider a two-stage pressure reduction.

Standard (Options)

Connection (Options)

Flanged

Material (Options)

EN-GJS-400-15 (Nodular Cast Iron)
Ductile Cast Iron

Pressure Rating (Options)

PN 16
PN 25

Description

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)
Size (DN)	L	H	h	Kvs Value	Weight (kg)
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.