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  • 国标内螺纹截止阀1.jpg
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National standard internal thread stop 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:

Screw thread valve series

Product Consulting:

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 "~ 2"
Applicable temperature:-20~120 ℃
Nominal pressure: PN 1.6MPa
Design and manufacture: GB/T 12237/ANSI B16.34
Structure length: GB/T 12221/ASMW B16.1
Thread standard: according to BSPT/BSP/NPT/DIN/JIS/RC/G
Inspection and test: GB/T 13927/API598





◆ Material of main components

Component Name Material
Valve body Stainless steel, CF8M
Stem Stainless steel, CF8M
Bonnet Stainless steel, CF8M
Metal Gasket Stainless steel, SS304
Packing PTFE, PTFE
Packing sleeve Stainless steel, SS316, 304
Packing gland nut Stainless steel, SS316, 304
Metal Gasket Stainless steel, SS316, 304
elastic washer Stainless steel, SS316, 304
Nut Stainless steel, SS316, 304

 

◆ Main outline connection dimension

NPS L W H
1/2" 87 63 97
3/4" 97 72 103
1" 117 72 110
1-1/4" 135 97 142
1-1/2" 163 98 167
2" 188 126 182

 

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