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  • 内螺纹硬密封闸阀1.jpg
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Internal thread hard seal gate 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.

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Classification:

Screw thread valve series

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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.

◆ Main performance specifications

Product specification: NPS 1/2~4 "(DN 15-100)
Nominal pressure: PN 1.6MPa
Applicable temperature:-20~180 ℃
Shell sealing pressure: 1.76MPa
Strength test pressure: 2.4MPa
Low pressure gas seal test pressure: 0.6MPa
Applicable medium: water, oil, air nitric acid, nitric acid
Design and manufacture: GB/T 12224
Structure length: GB/T 12221
Thread standard: ISO 228
Inspection and test: GB/T 13927









◆ Material of main components

Component Name Z15W-(15-25)C Z15W-(16-25)P Z15W-(15-25)R
Valve body WCB CF8 CF8M
Bonnet WCB CF8 CF8M
Ram 20Cr13/WCB NBR CF8/CF8 EPDM CF8M/CF8M EPDM
Stem 20Cr13 304 316
Gasket PTFE/Steel Strip Graphite Winding
Packing PTFE/Flexible Graphite

 

◆ Main outline connection dimension

DN G/in L d H W
15 1/2" 45 13 75 53
20 3/4" 48 17 81.5 53
25 1" 54 23 96 59
32 1-1/4" 58 29 114.5 64
40 1-1/2" 62.5 35 124.5 78
50 2" 67.5 44 146 75
65 2-1/2" 83.5 55 196.5 126
80 3" 91.5 63.5 206 126
100 4" 104.5 84.5 236 126

 

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