Valve is equipment, factory equipment, the specification should be marked with the following technical data:
Valve specifications; model; work pressure; manufacturing standards; valve body material; stem material; sealing material; filler material; valves open and close direction; rpm; public pressure conditions headstock maximum torque; Factory Factory Name: factory Date: weight; connecting flange diameter, pore number, the center hole distance, and hope to graphic images indicate length, width, and height control of size; indicate flow resistance coefficient; effectively open and close the number and installation, maintenance, notes, etc. .
2.10 valve Purchasing
Valve manufacturers around the country more than 2,000, Henan Province, more than 100, some manufacturers only a few people's workshop, so the valve manufacturing quality and price great hanging sparse. To this end, strongly urged the parties concerned to rectify the valve manufacturing industry, the establishment of quality licensing system, eliminate inferior products. Procurement valve suggested note the following:?
(1) Do not buy a single factory, shop around.
(2) The purchase of the manufacturers sought to the adoption of the ISO9001 quality system certification of enterprises, and pay attention to whether the products selected by the quality certification of products.
(3) According to the valve uses a different, according to the above discussion of the issues addressed in the argument, which provides a good technical requirements.
(4) The high quality valves and prices are accordingly more expensive, should be based on the general situation of enterprises in the price-performance on the selection of products to meet the business needs, can not be a model, the same price.
(5) The pipe network in the valve open and close are not frequent, but to replace them maintenance, but the loss of economic and social benefits is large, and therefore buy good quality, long-term may from time to overhaul the product is a common aspirations. Ruoyin a variety of reasons, cost performance lowered a bit, then we should focus on after-sales service to consider the timeliness of products.
(6) valve is a device, valve packing should not be ignored, small-caliber valve should strive for container transport, large-diameter valves should be placed on the appropriate packaging, to ensure that the valve in the integrity of long-distance transport. Flange should be added if necessary, block board, protect the sealing surface of the material does not change much.
(7) A number of water companies on the procurement of the disintegration of check valves must be appropriate to re-pressure test inspection, substandard products, non-payment measures, has a certain role, there is no family products can be found in that exemption The.
(8) valve should be kept in public coffers, if the large diameter valves can not be placed in the Treasury, the open-air display also should pay attention to the bottom of the drainage, the top should be covered, should never be exposed to the sun and rain. Study found that many manufacturers to create a new valve has been placed in the open sun and rain, valves using the unit also is the case, it must be corrected.
2.11 valve assembly
(1) The valve and pipe connections
In order to facilitate the valve of the Assembly and Disassembly, generally the side of the installation of valves and pipes to connect to the retention expansion joints, and some of the valves for the DN ≤ 400mm disc with single-axis device (live flange) instead of retention expansion bend. At present, some valve manufacturers have expansion joints with a retention valve products, is to be welcomed, but the price than the price of the valve plus the expansion bend even higher is not very reasonable to promote the use of its influence.
(2) The valve is inappropriate to enter the site
Pipeline construction is a long process, the construction is responsible for supply of materials often worry about problems, put the valve starts ancillary facilities such as the site received, even by a one-time installation Stake transported to the site, so that valve put in a few months sun and rain at the site, no supervision, problems will not easily emerge.
The proposed pipeline construction process, with the double-flat alternative to tube connected, pending completion of pipeline construction, pipe and valve wells masonry cleaning debris after (Inoue precast reinforced concrete panels are not covered), and then transported to the site one by one valve installation in place, and then complete the puzzle of the finishing well. Beijing Water Company to install large-diameter valves is to take such measures, worth learning from.
(3) The valve assembly after the test
Valve supervisory personnel in the valve site inspection after assembly to deal with assembly to inspect to see if it meet the drawing requirements; whether the operation and management needs; hoist inspection, open and close reading the instructions and the actual situation is in line headstock; hoist switch whether the number in line with the instructions; large-diameter pipe should penetrate into the tube inspection and cleaning sealing surface; and ready acceptance of records, the establishment of a good valve technical files.
2.12 Valve operation and management of
Valve can open and close well, not only to selection of the right valve, the product of good quality, well construction and installation, but also thoughtful management can act as "maintaining an army for a thousand days, military forces temporary" effect.
Good operation and management is reflected in the following three aspects:
Technical information available; valve operation and management of thoughtful; valve wells in good condition.
(1) of the valve technical data
Valve technical information, including the valve factory specifications; valves inspected and after the purchase of a single; valve assembly and the location of the card; valve maintenance record. For the street changes, the valve card should be up to date, sought to establish GIS management systems.
(2) valve operation and management of
Valve operation and management of the quality requirements, including the valve should be closed tightly or basic tight; the valve shaft at no filler rod seal leakage string; valves open and close light, instructions intact. Valve operation and management of daily work, including the valves open and close operation of the previous orders for approval records and operational records of the system; valves open and close regular weekly inspection of the records. Not ever for long-term operation of the valve, according to the size of caliber, a different set of weekly inspection cycle is necessary, normally only open and close the activities of a few pick up switch, to be completely shut down operations are prudent. Found that the failure to be put forward for the corresponding medium and large repair plans, the timely processing, in particular, could not be opened after the closure of the valve should be the same as for emergency repairs to burst pipes deal.
(3) The valve shaft position
Well conditions include valve shaft valve masonry meets the design requirements; covers non-destructive and the road of convergence intact; operation of the valve hole is accurate; wells without debris and sewage; valve surface, no rust spots. As the valve wells is a confined space, easy to form oxygen, carbon dioxide levels rise, once the maintenance staff not to strong downhole operations before the blast, ventilation and other measures, easy to endanger human life. When conditions permit, the large-diameter wells to the air valve shaft should be considered the technical measures for long-term convection is better. For the valve shaft shall regularly patrol show, buried in the timely processing of pressure problems, for the covers lost, damaged, repair burst pipes, as the same shall be dealt with urgently.
Wuhan water companies to the valve on the pipe network management as the device management requirements, the use of GPS satellite positioning system, the establishment of valve wells coordinate data, check the rules proposed assessment and scoring criteria, and strengthening management measures are worth the same industry in future.
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