QC/T 1062-2017Road tank vehicles for light fuel oil - Unloading valves (English PDF)

3.1 Loading and unloading valve

Installed on the road transport light fuel tank vehicle, a valve for loading/unloading the bottom of the vehicle.

3.2 Adapter

The component of the end of the drain valve is externally connected.

3.3 Interlocking device

A device consisting of a pneumatic interlock valve, a gas source switch, a gas pipeline, etc., is installed on the oil discharge valve, and is connected to the oil during the oil loading and unloading process.

For quick coupling of the pipe, the emergency shut-off valve can be opened by the interlocking device.

3.4 Water hammer pressure

Transient pressure in a piping system due to a sudden change in the flow state (flow rate).

3.5 Seal cap

The cap is installed on the drain valve to protect the sealing surface and ensure the sealing.

3.6 Sight glass

A device installed on a valve through which the condition of the medium inside the valve can be observed.

4.1 Function

The dump valve should have the following functions.

a) Mechanical connection with external coupler by quick connection;

b) Ensure sealing when closed.

4.2 Driver

4.2.1 The drive of the oil discharge valve shall meet the following requirements.

a) Open the valve manually or by other means;

b) The valve should be able to be opened by the crane pipe oil delivery valve or other matching joints.

c) The valve should be able to close automatically and ensure sealing after the open drive mode fails or is disconnected.

4.2.2 In the absence of internal pressure, ensure that the disc of the oil discharge valve can be pushed under a horizontal thrust of 250 N.

4.3 Stress

4.3.1 The nominal pressure of the oil discharge valve shall not be less than 500 kPa.

4.3.2 The water hammer pressure of the drain valve is 5 times the nominal pressure.

4.4 Materials

4.4.1 The selection of the material of the drain valve must fully consider its compatibility with the medium in contact.

4.4.2 The shell of the drain valve should be made of aluminum alloy castings or stainless steel castings, and should not be made of cast iron and non-metal materials.

4.5 Temperature range

The design temperature of the dump valve should be -20 ~ 50; when there are special environmental requirements, the design temperature should be -40 ~ 70.

4.6 Assignment of interlocks and other optional accessories

4.6.1 The installation position of the interlock drive and other optional accessories should be reserved for the oil discharge valve. For the allocation position, see Appendix A.

4.7 Dimensional requirements

4.7.1 The drain valve adapter shall meet the requirements of Appendix B, and the maximum opening depth shall not be less than 50.8 mm (calculated from the sealing surface).

The parallelism tolerance of the sealing surface of the sealing end and the sealing surface of the disc must not be greater than 0.1 mm, excluding transition angles such as chamfers.

4.7.2 The dimensions of the connection flange of the dump valve shall meet the requirements of Appendix C.

4.8 Conduction resistance

The static resistance between any conductive parts on the dump valve assembly that may come into contact with the transport medium and the dump valve body …

4.9 Sealing Cap Sealability

Equipped with a sealing cap to prevent leakage at an internal pressure of 25 kPa.

4.10 Shell strength

In the design temperature range, the discharge valve should not be clearly visible under the larger pressure of 2.5 MPa or 5 times the nominal pressure. Deformation and damage.

4.11 Case tightness

Within the design temperature range and the specified pressure conditions, the valve housing (including the operating mechanism) and connection parts should be able to withstand the interior The pressure was maintained for at least 60 s, and no obvious leakage was observed.

4.12 Seat tightness

Within the design temperature range and the specified pressure conditions, after the pressure is maintained for at least 60 s, the contact surface between the valve seat and the casing must not be clearly defined. Visible leakage.

4.13 Operability

The assembled valve should be able to be opened and closed flexibly through the opening and closing operation device, without jamming, and the closing time shall not exceed 5 s.

4.14 Service life

The valve has good operability and seat seal after 25 000 opening and closing operations without lubrication.

4.15 Optional accessories

4.15.1 Optional accessories for the dump valve equipment shall not affect the seal of the dump valve housing and the strength of the casing.

4.15.2 When configuring a window, it shall be able to meet the requirements of 4.11.

5.1 Number of tests

The number of type test samples is two.

5.2 Functional test

5.2.1 After the oil discharge valve is fixed according to the horizontal axis, the valve should be able to open normally by pulling the valve with the handle.

5.2.2 In the case of no internal pressure, use a horizontal thrust of 250 N to push the valve disc of the oil discharge valve, and push it continuously 2 times within 5 s.

5.2.3 After the thrust is canceled, the door should be able to close quickly and remain sealed.

5.3 Dimensions

Measure with vernier calipers or special calipers with an accuracy of 0.02 mm.

5.4 Static Conduction Test

5.4.1 Before the test, the oil discharge valve and its parts should be dried.

5.4.2 Use 500 V DC megohmmeter to measure resistance.

5.4.3 Measure the electrostatic resistance between any conductive part on the drain valve assembly that may be in contact with the medium and the housing.

5.5 Sealing test of sealing cap

5.5.1 The test medium shall be water, air, kerosene or one of the non-corrosive liquids with a viscosity not less than that of water. The temperature of the test medium shall be between 5 ~ 40.

5.5.3 Test time. The duration of maintaining the pressure test shall not be less than 60 s.

5.5.4 The test method shall be implemented in accordance with the "Check Valve" category in Table 3 of GB/T 13927-2008.

5.6 Shell strength test

5.6.1 The test medium should be one of water, kerosene or a non-corrosive liquid with a viscosity not higher than water. The temperature of the test medium should be 5 ~ 40.

5.6.2 Shell strength test pressure. According to the requirements specified in 4.10.

5.6.4 The connection end of the shell is closed, and the cavity in the valve is filled with test medium, so that the shell can bear the internal pressure.

5.6.5 The shell strength test method shall be implemented in accordance with the "stop valve" category of Table 3 in GB/T 13927-2008.

5.6.3 Test time

a) The duration of the factory test to maintain the test pressure shall not be less than 60 s;

b) The duration of the type test to maintain the test pressure shall not be less than 10 min.

5.7 Case tightness test

5.7.1 The test medium is air. The temperature of the test medium should be between 5 and 40.

5.7.2 Shell seal test pressure. 0.6 MPa.

5.7.3 Test time. The duration of maintaining the pressure test shall not be less than 60s.

5.7.4 The connection end of the shell is closed, and the cavity in the valve is filled with test medium, so that the shell can bear the internal pressure.

5.7.5 The test method for the tightness of the shell shall be implemented in accordance with the "Check Valve" category of Table 3 in GB/T 13927-2008.

5.8 Seat tightness test

5.8.1 The test medium shall be water, air, kerosene or one of the non-corrosive liquids with a viscosity not less than water. The temperature of the test medium shall be between 5 ~ 40.

5.8.2 Valve seat test pressure. 20 kPa.

5.8.3 Test time. The duration of maintaining the pressure test shall not be less than 60 s.

5.8.4 The test method shall be implemented in accordance with the "Check Valve" category in Table 3 of GB/T 13927-2008.

5.9 Operational test

5.9.1 Operational tests should be conducted under normal atmospheric pressure and room temperature environments with dedicated opening and closing operating devices.

5.9.2 The number of tests shall not be less than three.

5.10 Life test

5.10.1 The drain valve is opened and closed 25 000 times without lubrication.

5.10.2 After the test is completed, perform the valve seat tightness test again according to 5.8.

6.1 Factory items

6.1.1 Each product shall be inspected from the factory according to the specified items, and only after passing the inspection by the manufacturer and issuing a product certificate Leave the factory.

6.1.2 Factory inspection items

a) appearance;

b) shell tightness test;

c) Seat tightness test;

d) operational tests;

e) Conductive resistance.

6.2 Type inspection

6.2.1 Type inspection shall be carried out in any of the following cases

a) When new products are trial-typed;

b) After the official production, continuous production for 3 years or a cumulative output of 10,000 units;

c) After the formal production, if the structure, material and process are changed greatly, which may affect the performance of the product;

d) When there is a significant difference between the factory inspection and the type inspection.

6.2.2 In the case of type inspection, if it is a) or b) in 6.2.1, it shall be inspected in accordance with Chapter 4 of this standard; if 6.2.1 In cases c) and d), only the affected projects can be inspected.