Pressure reducing valve - Direct Acting for liquids & gases - REAH20-M | Miyawaki

Name: Pressure reducing valve - Direct Acting for liquids & gases - REAH20-M | Miyawaki
Brand: Miyawaki
SKU: Pressure reducing valve - Direct Acting for liquids & gases - REAH20-M | Miyawaki

Miyawaki REAH20-M Direct-Acting Pressure Reducing Valve for Liquids and Gases

The Miyawaki REAH20-M is a self-operated pressure reducing valve suitable for both compressible and incompressible media, including air, technical gases, water, and oil. The downstream pressure is internally sensed within the control chamber, directly adjusting the valve opening without external energy or impulse lines.

Technical Specifications

Connection: Flanged, DIN standard.
Body Material: Cast steel G17CrMo 5-5 / 1.7357.
Body Classes: PN63 and PN100.
PMA: 6.3 MPa for PN63, 10.0 MPa for PN100.
TMA / TMO: Up to 530°C.
PMO: 6.3 MPa for PN63, 10.0 MPa for PN100.
Kvs: 1.8–80 m³/h as per published tables DN15–DN100.
Maximum Pressure Reduction Ratio: 25:1.

Downstream Pressure Settings

Standard secondary pressure ranges are 0.05–0.1 / 0.1–0.16 / 0.16–0.25 / 0.25–0.4 / 0.4–0.63 / 0.63–1.0 / 1.0–1.6 MPa. Pressures below 0.05 MPa or above 1.6 MPa require technical evaluation for spring selection and sizing.

Construction and Operation

The valve is piston-operated, featuring O-ring sealing and no diaphragm. The conical disc rotates freely at 360°, minimizing unilateral seat wear. Additional gauges, special connections, and soft sealing for leakage class VI are available.

Applications

Applicable in compressed air lines, technical gases, lube-oil lines, pre-heater units, natural gas, LNG, and gasoline tank systems, provided material and sealing compatibility with the fluid is confirmed.

Selection Criteria

Sizing requires p1, p2, flow rate, medium, temperature, DN, Kvs, flange PN, required leakage class, and reduction ratio. For ratios above 25:1, consider two-stage pressure reduction.

Standard (Options)

Connection (Options)

Flanged

Material (Options)

1.7357
Cast Steel
GS 17 CrMo 55

Pressure Rating (Options)

PN 63
PN 100

Description

Features

Self-acting pressure reducing valves for liquids and gases

The model REA20 is a direct acting pressure reducinfgvalve designed for compressible media, such as air and various gasses and for incompressible media such as water, oil and others. The valve is self acting and does not require external energy.

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.

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.

Wide range of pressure reduction

Due to careffully selected springs an outstanding reduction ratio of 25:1 is achieved.

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.

Options available

- additional pressure gauges

- tailored connections for special applications

- softsealing for leakage class VI

Typical applications

Ideally installed in any fluid system or technical gases, such as lube oil lines, pre-heater units, natural gas lines, pressurized air lines, LNG or gasoline tank systems. Fits perfectly for other technical gases such as Atzetylene, Ammonia, Carbondioxide.

Dimensions/Weight

Size (DN)	Dimension (mm)			Kvs ValueKvs ValueKvs Value
	L	H	h
	PN63-100
15	210	289	82	1,8
20	230		66	3,2
25	230		66	5,0
32	260		81	7,9
40	260		83	13,0
50	300	416	100	20,0
65	340	445	113	34,0
80	380	553	140	51,0
100	430	582	154	80,0

Specifications

Body Material

Cast steel

G17CrMo 5-5

(1.7357)

Body design conditions

	PN63	PN100
Max. design pressure (MPa) PMA	6,3	10,0
Max. design temperature (℃) TMA	530	530
Max. operating pressure (MPa) PMO	6,3	10,0
Max. operating temperature (℃) TMO	530	530

Pressure - Temperature rating

PN	Temperature ℃
	-10･･･+50-10･･･+50-10･･･+50	100	150	200	250	300	350	400	450	500	530
	Pressure MPa
63	6,3	6,3	6,3	6,3	6,2	5,7	5,3	5,0	4,8	3,8	2,2
100	10,0	10,0	10,0	10,0	9,8	9,1	8,4	8,0	7,6	6,1	3,5

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 ranges higher than 1,6 MPa and lower than 0,05 MPa on request available.