Shut-off valve D400 - DBE, Drawings

Contents

Task

Introduction

1. Design of wedge gate valve

1.1 Gate Design

1.2 Spindle Design

1.3 Gland Seal Design

1.4 Power calculation of shutter

1.4.1. Define Packing Type

1.4.2. Determination of shutter wedge weight

1.4.3. Calculation of force for wedge movement and maximum force

along the spindle

1.4.4. Calculation of torque on the running nut

1.5. Housing, Cover and Gate Rack Design

1.6. Design of running nut assembly

2. Calculation of drive head

2.1. Selection of electric motor. Calculation of kinematic parameters

2.2. Gearing Calculation

2.2.1. Material selection and allowable stresses

2.2.2. Design Torque and Center Distance

2.2.3. Module, total number of teeth, basic geometric dimensions

2.2.4. Actual circumferential speed

2.2.5. Endurance check of teeth

2.2.5.1. Check for contact voltages

2.2.5.2. Check for bending stresses

2.3. Handwheel selection for manual sealing

3. Check the strength of the gate valve parts

3.1. Strength check of housing and cover

3.2. Calculation of flange connections

3.3. Calculation of racks

3.4. Spindle Calculation

3.5. Calculation of gland cover

Conclusion

Bibliographic list

Introduction

Shutoff gate valve is part of shutoff pipeline valves and serves to switch on and off the medium flow (liquid, gas, steam). The advantage of gate valves over other shutoff valves (valves, valves) is realized as a minimum hydraulic resistance, which makes them indispensable for pipelines through which the flow of medium constantly moves at a high speed.

Pipeline valves are selected by value of conditional pressure and by diameter of conditional passage. According to the control scheme, the valves can be with manual or remote control. According to the design, reinforcement with flange covers and flangeless with a self-sealing connection of the body with the cover are distinguished.

Gate valves are extended to conventional passages Dy = 100600 mm. Shutoff member of gate valves is made in the form of wedge gate with two self-aligning disks (plates) and two seats welded into body of body.

Sliding and lowering of gate valve is performed by means of non-rotating spindle installed in running nut. Connection of the running nut with the flywheel or the engine shaft is made through a reduction gear box

In the designed gate valve, the spindle is retractable and has only translational motion. In this case, the shutter is controlled by rotating the running nut associated with the drive gear. Control can be carried out both manually and with the help of electric, pneumatic, hydraulic drive

Conclusion

In this course design, we calculated and designed a shutoff valve with a drive head. The sequence of calculations took into account all the requirements of state standards and a unified system of design documentation. The gate valve as an element of the pipeline system meets the requirements for its strength, corrosion and erosion resistance, ease of control, hydraulic characteristics, etc.

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