Y43H Steam Pressure Reducing Valve (Spirax Sarco Type)
manufacturer: Kaiweixi Valve Group Co., Ltd.
Eml: Yannie@kaiweixi.com
Tel: +86（577）67038872
Mob: +86 189 6779 6135（WeChat Same Account）
product drawing
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Y43H Steam Pressure Reducing Valve (Spirax Sarco Type)
Overview
The Y43H Steam Pressure Reducing Valve (Spirax Sarco Type) is a pilot-operated piston-type steam-specific pressure reducing valve based on Spirax Sarco’s classic design philosophy. It adopts a two-stage pressure reduction structure with pilot valve sensing control and main valve piston actuation, specifically designed to stably and precisely reduce high-pressure superheated or saturated steam from boilers or main pipelines to the safe operating pressure required by process equipment or heating systems. Its core function is to achieve reliable control and stable supply of steam pressure under harsh working conditions such as large pressure differences, high temperatures and load fluctuations, ensuring the safe and efficient operation of steam-using equipment. Typically featuring a cast steel or stainless steel valve body and flange connection, it is an indispensable key pressure regulating device in industrial steam systems such as petrochemical, power generation, textile and food processing industries.
Features
1.Steam-Specific Design, Reliable Performance Structurally optimized for steam medium characteristics. Adopts high-temperature resistant materials and rigid sealing, with a balanced piston design for the main valve. Ensures smooth operation without jamming or whistling under high-temperature and large pressure difference conditions, delivering stable and reliable pressure reduction with a long service life.
2.Pilot-Operated Piston Structure, Precise Control Features an independent pilot valve to accurately sense downstream pressure and drive the main valve piston through control pipelines. The large force-bearing area of the piston provides strong opening/closing force and excellent adjustment linearity for the main valve disc. It offers strong compensation for inlet pressure fluctuations and flow changes, achieving high outlet pressure control precision and superior pressure stabilization.
3.Wide Pressure Reduction Ratio, Strong Adaptability Boasts excellent pressure reduction capability with a typical ratio of 10:1 or higher. It can directly reduce high inlet steam pressure to low working pressure in one step, simplifying system design. The wide adjustment range allows easy setting of the required outlet pressure by adjusting the pilot valve spring.
4.High-Temperature Resistance, Safe and Durable All pressure-bearing components and sealing materials are selected for high-temperature steam conditions, capable of withstanding saturated steam and a certain degree of superheated steam for long-term use. The robust structure is usually equipped with a built-in stainless steel filter screen to protect the pilot valve from pipeline impurities, ensuring operational safety and durability under harsh working conditions.
5.Easy Maintenance, High Integration The pilot valve and main valve adopt a modular design, facilitating quick disassembly for inspection, maintenance, or replacement of internal components (such as valve seats, seals, diaphragms/piston rings). Some high-end models integrate pressure gauge interfaces and independent safety valves, realizing integrated pressure monitoring and overpressure protection, which reduces installation space and costs.
Dimensions & constructral diagram
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Y43H Steam Pressure Reducing Valve (Spirax Sarco Type) constructral diagram
Material of main parts
| NO. | Name | Material |
|---|---|---|
| 1 | Valve body | ductile iron, cast steel, stainless steel |
| 2 | Pilot valve disc | stainless steel |
| 3 | Pilot valve spring | stainless steel |
| 4 | Main valve disc | stainless steel |
| 5 | Main valve seat | stainless steel |
| 6 | Main valve diaphragm | copper |
| 7 | Pilot valve filter element | copper |
| 8 | Pilot valve assembly and sealing | stainless steel+PTFE |
| 9 | Regulating spring | stainless steel |
| Performance Specification | |
|---|---|
| Nominal Pressure | 1/2.1/2.5 MPa |
| Shell Test | 1.5/3.15/3.75 MPa |
| Seal Test | 1.1/2.31/2.75 MPa |
| Suitable Temp. | ≤232 ℃ |
Specification and dimensions
| Size | Thread A | BS 10HI A1 | PN16/25 A1 | ASME 300 A1 | BS 10F A1 | ASME 150 A1 | JIS10/16 A1 | B | D | E | F |
|---|---|---|---|---|---|---|---|---|---|---|---|
| DN15LC | 160 | 130 | 130 | 126.6 | 117 | 120.2 | 122 | 185 | 406 | 276 | 130 |
| DN15 | 160 | 130 | 130 | 126.6 | 117 | 120.2 | 122 | 185 | 406 | 276 | 130 |
| DN20 | 160 | 150 | 150 | 133 | 133 | 139.4 | 142 | 185 | 406 | 276 | 130 |
| DN25 | 180 | 160 | 160 | 160.0 | 160 | 152 | 152 | 207 | 430 | 282 | 148 |
| DN32 | 180 | 180 | 180.0 | 176.0 | 176 | 176 | 207 | 430 | 282 | 148 | 148 |
| DN40 | 200 | 200 | 200.0 | 199.0 | 196 | 196 | 255 | 475 | 297 | 178 | 178 |
| DN50 | 230 | 230 | 230.0 | 228.0 | 222 | 222 | 255 | 475 | 297 | 178 | 178 |
