The GB Wedge Gate Valve
Gate valve，for its low fluid resistance, a minor pressure differential, the flow direction maintenance ability, erosion endured sealing surface and flow noninterference, can be applied with a wide range of pressure and temperature. As a common block valve, it is widely used in the oil media of petroleum, chemical, fossil-fuel power plants and in the steam pipelines. Its main role is to connect or cut off the medium in the pipeline, but it can not be used as a throttle valve.
Specifications of the GB Wedge Gate Valve
The size of the GB wedge gate valve has the following rage:
DN15, DN20, DN25, DN32, DN40, DN50, DN65, DN80, DN100, DN125, DN150, DN200, DN250, DN350, DN400, DN450, DN500, DN600, DN700, DN800, DN900, DN1000.
Structural Features of the GB Wedge Gate Valve
- Its drive device can be provided according to customer’s requirements, otherwise unspecified, a hand wheel drive.
- The upper stem nut keeps the valve stand still in the open position even without the hand wheel.
- The packing is made of flexible graphite material with reliable sealing performance. Specified as it is by the customer, offer the packing spacer ring and grease filling structure.
- The sealing design ensures the reliable packing-tight in the state of fully open. Discourage the replacement of packing with pressure.
- Between the elevating stem and gate plate is a T-groove connection, of which the head is integral forging to ensure an adequate connection strength.
Material Specifications of the Steel Wedge Gate Valve
| No. | Name | Carbon Steel Series | Stainless Steel Series | Alloy Steel Series | Cryogenic Steel Series |
| 1 | Body | WCB | CF8 | WC6 | LCB |
| 2 | Wedge | WCB | CF8 | WC6 | LCB |
| 3 | Stem | 1Cr13 | 0Cr18Ni9（304） | 25Cr2Mo1VA（F22） | 0Cr18Ni9（304） |
| 4 | Gasket | Graphite+SS304 | |||
| 5 | Bonnet | WCB | CF8 | WC6 | LCB |
| 6 | Nut | 35# | 0Cr18Ni9（304） | 35CrMoA | 0Cr18Ni9（304） |
| 7 | Stud | 35CrMoA | 0Cr18Ni9（304） | 25Cr2MoV | 0Cr18Ni9（304） |
| 8 | Back Seat | 1Cr13 | 0Cr18Ni9（304） | 0Cr18Ni9（304） | 0Cr18Ni9（304） |
| 9 | Packing | Graphite | Graphite/PTFE | ||
| 10 | Pin | 35# | 0Cr18Ni9（304） | 1Cr13 | 0Cr18Ni9（304） |
| 11 | Eyebolt | 35CrMoA | 0Cr18Ni9（304） | 35 | 0Cr18Ni9（304） |
| 12 | Eyebolt Nut | 35# | 0Cr18Ni9（304） | 35CrMoA | 0Cr18Ni9（304） |
| 13 | Packing Bushing | 1Cr13 | 0Cr18Ni9（304） | 1Cr13 | 0Cr18Ni9（304） |
| 14 | Gland | WCB | CF8 | WCB | LCB |
| 15 | Stem nut | ZCuAI10Fe3 | ZCuAI10Fe3 | ZCuAI10Fe3 | ZCuAI10Fe3 |
| 16 | Stem Nut Retainer | 35 | 0Cr18Ni9（304） | 35 | 0Cr18Ni9（304） |
| 17 | Handwheel | QT400-17 | QT400-17 | QT400-17 | QT400-17 |
| 18 | Handwheel Nut | 35# | 0Cr18Ni9（304） | 35 | 0Cr18Ni9（304） |
Specifications for Technical Performance Parameters of the GB Wedge Gate Valve
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| The design standard | GB/T 12234 | |||||||
| The pressure-temperature rating | GB/T 12234 | |||||||
| The structural length | GB/T 12234、GB/T 15188.1 | |||||||
| The flange dimension | GB/T 9113、JB/T 79 | |||||||
| The butt welded joint | GB/T 12234 | |||||||
| The test and trail | JB/T 9092, GB/T 13927 | |||||||
| The nominal pressure rating | PN1.6 | PN2.5 | PN4.0 | PN6.4 | PN10.0 | PN16.0 | PN20.0 | |
| The pressure test | The shell test | 2.4 | 3.75 | 6.0 | 9.6 | 15.0 | 24.0 | 30.0 |
| The high pressure seal-ability | 1.76 | 2.75 | 4.4 | 7.04 | 11.0 | 17.6 | 22.0 | |
| The low pressure seal-ability | 0.6 | 0.6 | 0.6 | 0.6 | 0.6 | 0.6 | 0.6 | |
| The temperature range | -196℃~550℃（Choose temperature-matched material.） | |||||||
| The media option | water, oil, gas and corrosive medium（Choose media-matched material.） | |||||||
