National standard globe valve
A valve is a mechanical device that controls the flow rate, flow direction, pressure, temperature, etc. of a flowing fluid medium. Valves are the basic components in piping systems. Valve fittings, like pumps in technology, are often discussed as a separate category.
Key words:
Classification:
Cast steel valve series
Description
A valve is a mechanical device that controls the flow rate, flow direction, pressure, temperature, etc. of a flowing fluid medium. Valves are the basic components in piping systems. Valve fittings, like pumps in technology, are often discussed as a separate category. The valve may be operated manually or with a hand wheel, handle or pedal, and may also be controlled to vary the pressure, temperature and flow rate of the fluid medium. The valve can perform continuous or repeated operations on these changes, such as safety valves installed in hot water systems or steam boilers. In more complex control systems, automatic control valves are used as required by external inputs (I. e., to adjust the changing set point of the flow through the pipeline). The automatic control valve does not need to be manually operated according to its input and setting, so that the valve can accurately control the various requirements of the fluid medium. Valves can also be divided into cast iron valves, cast steel valves, stainless steel valves, chromium molybdenum steel valves, chromium molybdenum vanadium steel valves, dual phase steel valves, plastic valves, non-standard customized valve materials, etc.
◆Product Overview
The national-standard globe valve is suitable for pipelines in various service conditions—such as the petroleum, chemical, pharmaceutical, fertilizer, and power industries—operating at nominal pressures of PN 1.6 to 6.4 MPa and temperatures ranging from −46°C to 550°C, where it serves to shut off or connect the pipeline medium.
◆Product Features
1. The product features a well‑designed structure, reliable sealing, excellent performance, and an attractive appearance.
2. The sealing surface is overlay-welded with a cobalt-based hard alloy, offering excellent wear resistance, corrosion resistance, and scuff‑resistance, resulting in a long service life.
3. The valve stem undergoes quenching and tempering followed by surface nitriding, providing excellent corrosion resistance and wear resistance.
4. The valve is equipped with a back-seal structure, ensuring reliable sealing.
5. The material of the components and the flange dimensions can be appropriately selected based on actual operating conditions or user requirements, meeting a wide range of engineering needs.
◆Implementation Standard
| Product Specification | Design Specifications | Structural length | Connection flange | Testing and Inspection | Pressure-Temperature |
| GB/T 12235 | GB/T 12221 | JB/T 79.1, GB/T 9113, HG/T 20592 | GB/T 26480 GB/T 13927 | GB/T12224 |
◆Main Performance Specifications
1. Test pressure
| Nominal pressure PN (MPa) | 1.6 | 2.5 | 4.0 | 6.4 | 10.0 | 16.0 |
| Hull Strength Test | 2.4 | 3.8 | 6.0 | 9.6 | 15 | 24 |
| Upper Seal Test | 1.8 | 2.8 | 4.4 | 7.0 | 11 | 18 |
| Sealing Test | 1.8 | 2.8 | 4.4 | 7.0 | 11 | 18 |
2. Applicable Media and Operating Temperature
| Product Type | Applicable medium | Applicable temperature: ℃ |
| J41 H Y -C type J941 H Y -C type |
Water, oils, steam | ≤425 |
| J41 H Y -P-type J941 H Y -P-type |
Nitrate compounds | ≤200 |
| J41 H Y -R type | Acetic acid compounds | ≤200 |
| J41 H Y -Type I J941 H Y -Type I |
Water, oils, steam | ≤550 |
◆Materials of Main Components
| Product Type | Part Name | |||||||
| Valve Body/Valve Bonnet | Valve stem | Valve disc | Sealing surface | Valve stem nut | Filler | Fastener | Handwheel | |
| J41 H Y -C type J941 H Y -C type |
25/WCB | Chromium stainless steel | 2Cr1325 | H: Stainless steel Y: Cobalt-based hard Carbide steel |
Copper alloy | Flexible graphite | High-quality carbon steel | Malleable cast iron |
| J41 H Y -P-type J941 H Y -P-type |
Chromium-nickel steel | Chromium-nickel steel | Chromium-nickel steel | Chromium-nickel steel | Copper alloy | Flexible graphite | Stainless steel | Malleable cast iron |
| J41 H Y -R type | Chromium-nickel-molybdenum steel | Chromium-nickel-molybdenum steel | Chromium-nickel-molybdenum steel | Chromium-nickel-molybdenum steel | Copper alloy | Flexible graphite | Stainless steel | Malleable cast iron |
| J41 H Y -Type I J941 H Y -Type I |
Chromium-molybdenum steel | Chromium-molybdenum steel | Alloy steel | Cobalt-based cemented carbide steel | Copper alloy | Flexible graphite | Alloy steel | Malleable cast iron |
◆Main External Connection Dimensions
| Nominal pressure PN | DN(mm) | L | D | D1 | D2 | b | f | Z-Фd | H | D0 |
| PN1.6MPa | 50 | 230 | 165 | 125 | 102 | 18 | 3 | 4-F18 | 350 | 240 |
| 65 | 290 | 185 | 145 | 122 | 18 | 3 | 8-F18 | 355 | 280 | |
| 80 | 310 | 200 | 160 | 138 | 20 | 3 | 8-F18 | 400 | 280 | |
| 100 | 350 | 220 | 180 | 158 | 20 | 3 | 8-F18 | 415 | 320 | |
| 125 | 400 | 250 | 210 | 188 | 22 | 3 | 8-F18 | 460 | 360 | |
| 150 | 480 | 285 | 240 | 212 | 22 | 3 | 8-F22 | 510 | 400 | |
| 200 | 600 | 340 | 295 | 268 | 24 | 3 | 12-F22 | 710 | 400 | |
| 250 | 730 | 405 | 355 | 320 | 26 | 3 | 12-F26 | 789 | 450 | |
| 300 | 850 | 460 | 410 | 378 | 28 | 4 | 12-F26 | 925 | 500 | |
| PN2.5MPa | 50 | 230 | 165 | 125 | 102 | 20 | 3 | 4-F18 | 350 | 240 |
| 65 | 290 | 185 | 145 | 122 | 22 | 3 | 8-F18 | 400 | 280 | |
| 80 | 310 | 200 | 160 | 138 | 24 | 3 | 8-F18 | 355 | 280 | |
| 100 | 350 | 235 | 190 | 162 | 24 | 3 | 8-F22 | 415 | 320 | |
| 125 | 400 | 270 | 220 | 188 | 26 | 3 | 8-F26 | 460 | 360 | |
| 150 | 480 | 300 | 250 | 218 | 28 | 3 | 8-F26 | 510 | 400 | |
| 200 | 600 | 360 | 310 | 278 | 30 | 3 | 12-F26 | 710 | 400 | |
| 250 | 730 | 425 | 370 | 335 | 32 | 3 | 12-F30 | 789 | 450 | |
| 300 | 850 | 485 | 430 | 395 | 34 | 4 | 16-F30 | 925 | 500 |
Note: In this table, flange dimensions comply with GB/T 9113, and structural lengths comply with GB/T 12221.
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