HG/T 2062-1991 Air pressure reducing valve for rubber machinery

HG/T 2062-1991 Air Pressure Reducing Valve for Rubber Machinery HG/T2062-1991 Standard download decompression password: www.bzxz.net

Chemical Industry Standard of the People's Republic of China
HG / T 2062-91
Air Pressure Reducing Valve for Rubber Machinery
Published on July 6, 1991
Ministry of Chemical Industry of the People's Republic of China
Implemented on January 1, 1992
Chemical Industry Standard of the People's Republic of China
Air Pressure Reducing Valve for Rubber Machinery
Subject Content and Scope of Application
HG/T2062-91
This standard specifies the basic parameters, technical requirements, test methods and inspection rules of air pressure reducing valves for rubber machinery (hereinafter referred to as pressure reducing valves).
This standard applies to air pressure reducing valves for rubber machinery 2 Reference standards
GB191 Pictorial symbols for packaging, storage and transportation
GB6388 Shipping and receiving marks for transport packaging
HG5-1543 General technical conditions for rubber machinery packaging JB8 Product label
3 Basic parameters
The basic parameters of the pressure reducing valve shall comply with the provisions of Table 1. Table 1
Nominal diameter, mm
Nominal pressure, MPa
Pressure regulation range, MPa
Threaded connection size, mm
4 Technical requirements
4.1 Working conditions
0.05~1.60
M32×2
4.1.1 Working medium: Clean and dry compressed air with a solid particle diameter of no more than 50um after being filtered through a filter with a water separation efficiency of not less than 80%.
4.1.2 Ambient and medium temperature: 5~60℃.4.2 Sealing
There should be no leakage at the outlet and joints of the pressure reducing valve under the nominal pressure for 2 minutes. 4.3 Pressure regulation
When the nominal pressure is input to the inlet, adjust the pressure reducing valve. The outlet pressure should change evenly within the specified pressure regulation range without any jump. www.bzxz.net
4.4 Pressure characteristics
Approved by the Ministry of Chemical Industry of the People's Republic of China on July 6, 1991 and implemented on January 1, 1992
HG/T 2062-91
When the air flow rate of the pressure reducing valve is 960L/min, the value of the change of its set outlet pressure with the inlet pressure shall not be greater than 0.05 MPa.
4.5 Pressure resistance
The pressure reducing valve shall be subjected to a pressure resistance test of not less than 1'min at 1.5 times the nominal pressure. During the test, all parts shall not be damaged or abnormally deformed.
4.6 Durability
Under the specified working conditions, the pressure reducing valve shall comply with the technical performance specified in Articles 4.2 to 4.5, and the number of operations shall not be less than 1 million times. 4.7 Appearance
The plating and paint on the outer surface of the pressure reducing valve shall be uniform, smooth and flat, without scratches, peeling and other defects. The label shall be clear and firmly installed, without falling off or warping, and the fasteners shall not be loose. 5 Test method
5.1 Test conditions
5.1.1 Test medium: clean, dry and non-corrosive compressed air. 5.1.2 Test medium temperature: 15~35℃
5.1.3 The test pressure shall comply with the provisions of Table 2. Table 2
Test pressure, MPa
Allowable fluctuation value
· Outlet pressure, MPa
5.1.4 Test environment temperature: 15~35℃
5.1.5. Test instruments and meter accuracy: pressure gauge shall not be lower than Class 0.4; ||t t||The flow meter is not lower than grade 2.5;
The thermometer (meter) is of ordinary type:
5.2 Sealing test
0.25~1.60
5.2.1 When the inlet pressure of the pressure reducing valve is 2.50MPa and the outlet pressure is zero, apply soapy water to the outlet and observe that the sealing condition shall comply with the provisions of Article 4.2.
5.2.2 When the inlet pressure of the pressure reducing valve is 2.50MPa and the outlet pressure is adjusted to 1.60MPa, apply soapy water to the locking cover, pressure gauge connection, screw plug and overflow port and observe that the sealing condition shall comply with the provisions of Article 4.2. 5.3 Pressure adjustment test
When the nominal pressure is input to the inlet of the pressure reducing valve, adjust the pressure reducing valve and observe that the change of its outlet pressure shall comply with the provisions of Article 4.3.
5.4 Pressure characteristic test
The principle of pressure characteristic test and the structure of pressure taking port are shown in Figure 1 and Figure 2 respectively. The outlet pressure of the pressure reducing valve to be tested is adjusted to 0.25, 0.40, 0.63, 1.00 and 1.60MPa respectively, and the outlet flow is 960Lm (the inlet pressure is adjusted from high to the lower limit pressure that can meet the outlet pressure and flow). Then, starting from the lower limit pressure, the inlet pressure of the pressure reducing valve to be tested is gradually increased. Each time it is adjusted, the outlet pressure is measured once until the inlet pressure is adjusted to the highest. The pressure change value calculated based on the measured outlet pressure value should comply with the provisions of Article 44. 5.5 Pressure resistance test
HG/T 2062
Figure 1 Schematic diagram of pressure characteristic test
2—Air alkali pressure valve; 3.5—Pressure gauge; 4—Tested pressure reducing valve: 6—Throttle valve: 7—Flow meter
No protrusions and burrs are allowed
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Figure 2 Structure diagram of pressure taking port
Input water with 1.5 times the nominal pressure into the inlet of the pressure reducing valve, adjust the outlet pressure to 2.50MPa, and close the outlet. Maintain the pressure for 1min. Observe that the pressure resistance of the pressure reducing valve should comply with the provisions of Article 4.5. 5.6 Durability test
The principle of durability test is shown in Figure 3.
Figure 3 Principle of durability test Schematic diagram
Air source; 2—air pressure reducing valve; 3, 6—pressure gauge; 5—tested pressure reducing valve; 2-position 2-way reversing valve; 7—counter
Adjust the pressure reducing valve inlet pressure to 1.0MPa, and the outlet pressure to 0.40MPa. Set the switching time interval of the reversing valve per second
HG/T2062---91
to 0.5s. The two valves switch in the opposite direction synchronously, continuously or intermittently. After completing the specified number of durability work, conduct the tests in 5.2 to 5.5, which should meet the technical requirements respectively. 5.7 Appearance inspection
Use visual inspection to check the appearance, which should meet the requirements of Article 4.7. 6 Inspection rules
6.1 Each pressure reducing valve must be inspected before leaving the factory. Each pressure reducing valve must be inspected and qualified by the quality inspection department of the manufacturer before leaving the factory. It should be accompanied by a product quality certificate when leaving the factory. 6.2
The factory inspection and type inspection of pressure reducing valves shall be carried out in accordance with the technical requirements and test methods specified in Table 3Table 3
Sealing
Pressure regulation
Pressure characteristics
Pressure resistance
Durability
Note: Items marked with \\ are items for inspection6.4 Type inspection shall be carried out in any of the following situations:a.
Technical requirements
Trial and final product identification for new products or old products transferred to the factory for production; when the product has major changes in structure, material and process; when the product is long After a period of suspension (more than two years), when resuming production; Test method
Under normal production conditions, when the cumulative output is more than 50 units, at least 3 units shall be sampled for inspection before delivery
Type inspection
6.5 When there are unqualified items in the random inspection, double sampling shall be conducted for this item. If there are still unqualified items, the batch of products shall be inspected for this item one by one
Marking, packaging and storage
7.1 Each product shall have a product label fixed in an appropriate and obvious position. Its type, size and technical requirements shall comply with the provisions of JB8.
7.2 The basic content of product marking should include: manufacturer name or trademark;
product name and model;
nominal diameter;
nominal pressure;
medium flow direction;
thread size mark of pipe;
manufacturing date and factory number
7.3 Product packaging should comply with the provisions of HG5-1543: the inlet and outlet of the pressure reducing valve should be closed, HG/T2062-91
7.4 The packaging and transportation marking of the product should comply with the provisions of GB191 and GB6388. The pressure reducing valve should be stored in a ventilated and dry warehouse. 7.5
Additional Notes:
This standard is proposed by China National Chemical Equipment Corporation. This standard is under the jurisdiction of the Rubber Machinery Subcommittee of the National Technical Committee for Rubber and Plastic Machinery Standardization, and this standard is drafted by the Beijing Rubber Industry Research and Design Institute of the Ministry of Chemical Industry. The main drafters of this standard are Pan Yanying and Liang Dingqiu. People's Republic of China
Chemical Industry Standard
Air Pressure Reducing Valve for Rubber Machinery
HG/T2062-91
Editor Chemical Industry Standard Editorial Department
(Standardization Research Institute of the Ministry of Chemical Industry)
Postal Code: 100013
Printing Chemical Industry Standardization Research Institute
Copyright reserved, no reproduction allowed
Format 880×12301/16 Printing Sheet Word Count 9000 First Printing in October 1992
First Edition in September 1992
Print Quantity 1-500
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