Valve operation management of valve gasket efficiency and valve gasket A series specifications

Valve operation management of valve gasket efficiency and valve gasket A series specifications

Valve operation management quality requirements include valve should be closed tight or basically tight; Valve shaft seal packing does not leak; Valve open and close lightly, marking intact. The daily work of valve operation management includes the approval record and operation record of valve opening and closing actual operation sheet over the years; Open and close record of weekly valve inspection on time. For long-term valve without actual operation, according to the size of the specification, it is necessary to set a different weekly inspection cycle, generally * open and close theme activities number of turn, if you want to completely shut down the actual operation is cautious.
Valve operation management
Valve can open and close good, not only to choose the appropriate valve model, good product quality, careful construction and assembly, and also need comprehensive management methods, can have the actual effect of “raise soldiers for thousands of days, use soldiers for a while”.
Good operational management is reflected in the following three aspects: technical documentation; Comprehensive valve operation management; Valve well in good condition.
(1) Technical documents of valves
The technical data of the valve, including the instructions for the use of the valve before delivery; Inspection certificate of valve after purchase; Valve assembly and parts of the credit card; Valve maintenance record. In view of the changes of the community, valve-credit card should be updated in time, so as to establish GIS intelligent management system.
(2) Valve operation management
Valve operation management quality requirements include valve should be closed tight or basically tight; Valve shaft seal packing does not leak; Valve open and close lightly, marking intact. The daily work of valve operation management includes the approval record and operation record of valve opening and closing actual operation sheet over the years; Open and close record of weekly valve inspection on time. For long-term valve without actual operation, according to the size of the specification, it is necessary to set a different weekly inspection cycle, generally * open and close theme activities number of turn, if you want to completely shut down the actual operation is cautious. For the common faults found should be put forward the corresponding major and medium repair scheme, properly handled, especially after closing the valve can not open should be like maintenance burst to carry out emergency solution.
(3) Valve well condition
The valve well condition includes the valve well wall meets the design requirements; Manhole cover high quality and ground docking intact; The actual operation of the valve hole distance is accurate; No dirt and waste water in the well; Valve surface without rust. Because the valve well is a closed indoor space, it is very easy to produce insufficient oxygen and increase the carbon dioxide content. Once the maintenance personnel do not carry out strong blower and ventilation measures before entering the well, it is very easy to seriously endanger human life. If conditions permit, the technical measures of long-term thermal convection of gas in the well should be taken into account in large diameter valve Wells. For the valve well should be on time patrol, properly deal with the problem of buried pressure, for the drain cover loss, damage should be as maintenance burst emergency solution. Wuhan water supply enterprises clearly put forward the valve management method in the pipeline network like the provisions of equipment maintenance, use GPS vehicle monitoring system, create valve well coordinate data, clearly put forward the implementation rules and evaluation standards of identification and inspection, and strengthen the management measures are worthy of reference for the competition in the same industry. This article is based on the original “China Water association science and Technology Committee pipeline professional committee investigation report” of the specific content, moderately narrow and add some of my views, improper hope correction.
Valve gasket functions and valve gasket series A product specification valve gasket is valve socket flange plate gaskets or single valve gaskets, gasket application mainly lies in the flange and the working pressure, if general working pressure is not high availability asbestos gasket or graphite composite gasket, metal winding gasket pressure is too much words, if you want to corrosion, high temperature resistant four fluorine pad application is not too high, If it is a high temperature resistant commodity, the application of graphite composite pad or metal material graphite winding pad, if it is the RJ surface, the application of metal ring pad single has some applications at the same time with the valve supporting facilities, is graphite filling ring, if there is a direction is self-sealing (such as 45 Angle, 30 Angle).
Valve gasket sealing effect, gasket raw material selection in accordance with the following standards:
1) In the presence of water or over 80° water standard, polyethylene PE plastic;
2) In the presence of oil and corrosion and the premise of continuous high temperature, with metal material gasket;
3) In the premise of sound insulation, noise reduction and electrostatic induction, with stone gasket.
Gasket is a machine seal between two objects, which is generally used to avoid working pressure, erosion, and natural thermal expansion and contraction leakage of the pipeline between two objects. Because machined surfaces are unlikely to be manufactured to perfection, the irregularity can be remedied by the application of gaskets. Gaskets are generally made of sheet materials, such as paper pads, plastic, silicone, metal materials, cork board, felt, neoprene, nitrile rubber, glass fiber or plastic polymers (such as polytetrafluoroethylene). Gaskets for special use are likely to have stone cotton.
Valve gasket is valve socket flange plate gaskets or single valve gaskets, gasket application mainly lies in the flange and the working pressure, if general working pressure is not high availability asbestos gasket or graphite composite gasket, metal winding gasket pressure is too much words, if you want to corrosion resistance, resistance to high temperature is not too high application of ptfe pad, if something is a high resistance to high temperature, Application of graphite composite pad or metal material graphite winding pad, if it is the RJ surface, the application of metal ring pad single has some applications at the same time with the valve supporting facilities, is graphite filling ring, if there is a direction is self-sealing (such as 45 Angle, 30 Angle).
DD delta t.
Kg per 1000 reference quality
Specification limit deviation Size limit deviation 18
0.5
0
26
0 ~ 0.5
1.50.8320280.9022300.9824321.0627351.1730381.2833431.7936461.9339502.3142522.2145583.1552653.5856704.1660754.7768824.957 08527.3075907.77851008.7190110
0 ~ 1.0
12.569511513.1910512514.4411013015.0711513515.7013015017.5813515518.2114016018.34160190349.4618021556.52 note: This series of products are suitable for grey cast iron and malleable cast iron valves in the middle of the flange gasket.