| Type: | Straight-through |
|---|---|
| Material: | Stainless Steel |
| Connection Form: | Thread |
| Pressure: | Low Pressure |
| Actuator: | Manual |
| Thread Position of Valve Rod: | Outside Gate Valve |
| Customization: |
|---|
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Internal thread gate valve, also known as cut-off valve, is the most widely used valve and belongs to the forced sealing type valve. Its closing principle is to rely on the valve stem pressure to make the valve disc sealing surface and valve seat sealing surface tightly fit, preventing medium flow. It is divided into multiple categories in different ways. The internal threaded gate valve has the characteristics of simple structure, good sealing performance, long service life, high fluid resistance, and poor regulating performance.
Internal threaded gate valves, high-pressure gate valves, and corrugated tube globe valves are forced sealing valves. Therefore, when the valve is closed, pressure must be applied to the valve disc to force the sealing surface not to leak. When the medium enters valve 6 from below the valve disc, the resistance that needs to be overcome by the operating force is the friction force between the valve stem and packing and the thrust generated by the pressure of the medium. The force to close the valve is greater than the force to open the valve, so the diameter of the valve stem should be larger, otherwise the failure of the valve stem top bending will occur. After the appearance of self sealing valves, the medium flow direction of the shut-off valve changes from above the valve disc to enter the valve chamber. At this time, under the action of medium pressure, the force to close the valve is small, while the force to open the valve is large, and the diameter of the valve stem can be correspondingly reduced. At the same time, under the action of the medium, this type of valve is also relatively tight. The "three modernizations" of valves in China once stipulated that the flow direction of shut-off valves should be from top to bottom.
When the internal threaded gate valve is opened, the opening height of the valve disc is 25% to 30% of the nominal diameter, and the flow rate has reached its maximum, indicating that the valve has reached the fully open position. So the fully open position of the shut-off valve should be determined by the stroke of the valve disc.
Feature.
1.Full Bore.Main Parts and Material.
| No | Part Name | Part Material |
| 1 | Body | CF8/CF8M |
| 2 | Wedge | CF8/CF8M |
| 3 | Stem | SS304/SS316 |
| 4 | Bonnet | CF8/CF8M |
| 5 | Packing | PTFE |
| 6 | Thrust Washer | SS304 |
| 7 | Yoke | SS 304/SS 316 |
| 8 | Packing | PTFE |
| 9 | Nut | SS 304 |
| 10 | Nut | SS 304/SS 316 |
| 11 | Handwheel | HT(C.R) |
| 12 | Nameplate | Aluminium |
| 13 | Gasket | SS 304 |
| 14 | Handwheel Nut | SS 304 |
| Size | 1/2″ | 3/4″ | 1″ | 11/4″ | 11/2″ | 2″ |
| A | 15 | 20 | 25 | 32 | 38 | 50 |
| H | 90 | 97 | 108 | 120 | 146 | 163 |
| L | 55 | 60 | 65 | 75 | 85 | 95 |
| D | 70 | 70 | 80 | 80 | 90 | 100 |
| Connection methods | threaded connection |
| Working pressure | 0.1MPA to 2.5MPA |
| Valve diameter | DN1~DN50 |
| Working temperature | -20 ° C to 245 ° C |
| Transmission methods | manual, electric, and pneumatic |
| Standards | ational standards GB, JB, HB, Japanese standards JIS, JPI, American standards API, ANSI, German standards DIN, non-standard customization, etc. |
| Materials | ast iron, cast steel, stainless steel, chromium molybdenum steel, chromium molybdenum vanadium steel, duplex stainless steel, forged steel, brass, etc. |
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