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Solenoid Valve on the problems of procurement and selection

Solenoid Valve and the correct choice of process piping in the end form of connection (loop side connection / convex connection / on the clip-on). If equipped with the flange, requiring suppliers to provide the valve between the flanges of the valve and gasket matched, should be specified in the Technical Annex of the contract requirements and the flange material, pressure rating and flange over the pipe label. Solenoid Valve wafer type itself if a single flange, flange holes containing silk thread should be metric, if the set screw for the completion of the British system, upon request, with a connecting bolt valve suppliers.

If the Solenoid Valve with solenoid valve, the proposed contract in the Technical Annex of the solenoid valve to indicate some of the technical parameters of manufacturers, brands, voltage level, explosion-proof form, material requirements and Solenoid Valve on and off the travel time requirements, but without indicate the specific type of electromagnetic valve, the valve supplier specific models should be calculated according to the final selection of tests or plant type, but it should indicate whether to allow suppliers to use in the control gas valve solenoid valve as a pilot. When the Solenoid Valve air volume requirements of the implementing agencies, in order to shorten the journey time Solenoid Valve, the solenoid valve as a pilot valve and the flow capacity of pneumatic actuators following the combination, can reduce costs, but also increased the number of attachments, because the gas Road links the increase means the increase of the point of failure, so the discussion of the Technical Annex shall determine whether to allow use of the pneumatic control program.

Recommended either diaphragm or piston actuator actuator must be equipped with air filter pressure reducer, the executing agency to be driven air pressure.

Prior to shipment, Solenoid Valve with attachments should be connected in a complete production plant, and tested to meet the requirements of the Technical Annex to the contract. Solenoid Valve suppliers should be based on the valve applications, the decision is a pipe connecting pipe, PVC pipe or stainless steel sheath, according to the valve of the gas travel time requirements determine the diameter of connecting pipe. General Solenoid Valve in the gas line connecting pipe of diameter not less than 8 × 1mm, because it is too small will cause slow response Solenoid Valve, of course, if the switch Solenoid Valve travel time permits, can also use the diameter of 6 × 1mm of gas line connecting pipe.

Solenoid Valve in the diameter size should be as consistent with the design documents, if you have to change, should process piping, equipment and related communications professional engineers (such as not allowed to change, the relevant professionals should discuss the decision to change the program) to carry out the appropriate design changes.

The valve should be noted that the corrosion problem. Solenoid Valve purchased if there is cavitation, flashing, cavitation, erosion and other problems, you should pay attention to whether to take the appropriate means to deal with, whether to avoid or minimize these problems the probability of occurrence of these phenomena. Valve body, spool and cage, seat ring material should be rigid steel or alloy steel, or nitriding treatment or add other surface coating (such as plating STALIN Levin). Solenoid Valve should definitely be avoided under a variety of applications in the cavitation phenomenon occurs.

Technical Annex of the contract must be in the shape of the valve size and positioning device to confirm the installation location of attachment request to identify the Solenoid Valve in the installation space, accessory mounting position and drawing the location of available space on the installation if there is a conflict between . If a conflict exists, we must first confirm whether the change Solenoid Valve actuator or valve installation position and orientation, the installation location of the annex. If you can not change the position of the valve should be circular process, piping, equipment, electrical and other related professionals as soon as possible to modify the layout and design.

Should require contractors to provide key components of Solenoid Valve material analysis, Solenoid Valve leakage test reports, pressure test report, test report or compliance certification form, pneumatic connection diagram, Solenoid Valve used in pressure testing procedures, methods and Testing Solenoid Valve leakage test procedures, methods for inspection, review.

RFP should require bidders to provide samples of Solenoid Valve selection (a specific type of sample code, abbreviations should be explained in detail), application performance. Technology contract should require contractors to provide the valve body and its accessories routine maintenance manuals, accessories agents and dealers contact address, fax and telephone number.

Solenoid Valve attachment protection should not be less than IP54/NEMA4 (digital valve positioner level of protection is generally IP65/NEMA4X), junction box should be sealed into the outlet port.

Application of Solenoid Valve bit number should be reflected in the valve plate, or a separate state in a sign be fixed to the Coach Bags valve. In addition to double the outside, should be clearly marked on the body through the valve to allow the direction of the media.

Solenoid Valve should be based on the criticality of applications and consider whether to set the hand wheel.

Solenoid Valve should be required to provide the supply side of the valve dead zone parameters and the distribution / gas valve Solenoid Valve locator fundamental error parameters. General, the valve dead zone parameters should not exceed 2%, power / gas valve Solenoid Valve locator fundamental error should be less than ± 10%, if equipped with digital valve positioner, Solenoid Valve of the basic error should be less than ± 1%.

Solenoid Valve should be noted that the requirements of air pressure. According to the actual situation of the device, check the Solenoid Valve executive body of the instrument air pressure requirements. If the device in the instrument air pressure can not meet the requirements of the implementing agencies, the supplier should replace the valve actuator at the same time, provide high-quality instrument air, or at least should meet the following requirements: clean, dry, corrosion does not contain obvious impurities, the gas containing solid particles is less than 0.1g / m 3, particle diameter of not more than 3 μ m, the oil content of less than 1 × 10 (-6 power), according to statistics, not clean air caused by positioning working conditions can not account for the locator more than 60% failure rate.

Designers generally design units have been selected core body parts (valve, valve seat, stem, valve cage, ring, packing, gasket) material. The final valve selection should be consistent with the design requirements, and if not, must confirm the suitability of material after the change, if in doubt, it must be for technical clarification.

Solenoid Valve arrive, shall promptly notify the supplier out of the box, to request the supplier to send personnel to participate in the inspection, if the supplier by fax or letter recognition, and recognize the results of the user's out of the box. Detailed inspection should record all inspection results should not miss any details, and inspection results and the contract should be in control of the Technical Annex, note the deviation, and the inspection report along with timely feedback to the supplier and request in a timely manner for processing. Out of the box as much as possible without delay, the time of inspection, or may affect the claims and the progress of works. Also be noted that, Solenoid Valve bit number, valve, actuator and accessories model, serial number and other parameters should be recorded, make the record work, for later use when ordering parts with goods. Because if not a note of these parameters, Solenoid Valve after prolonged use, the parameters of the nameplate will be ambiguous and difficult to recognize, there may be missing the nameplate, and some parameters on the procurement of spare parts is necessary.

Order digital locator software needed, just specify the name of the software provided and indicate the time of delivery to the latest version of the software version number can not write.

Solenoid Valve with spare parts and order, can save costs, procurement of spare parts to 1 to 2 years, the number of normal production to meet the need of principle. Solenoid Valve parts if the use is not clear, may require the supplier recommended, taking into account financial factors.

Never bundle bidding. To two or more different with the procurement of goods and Solenoid Valve, if a package of goods have properties of both cheap and poor or very expensive goods, unpacking in the case are not allowed, it is difficult to achieve choice of co-existence.

Proposed payment and delivery schedule, product quality, service linked to a certain degree of retention money set aside for the supplier to provide product quality and service quality assessment.

If the media through the Solenoid Valve is one-way flow, Solenoid Valve must not reverse installation, otherwise it will affect the valve's flow capacity, flow characteristics, sealing performance and operation stability.

The signing of the contract, the contract should clearly a technical annex, the supplier can not supply the product or the failure of normal use, the supplier shall promptly provide the products on debugging, dealing with the problems, or be replaced and provide temporary substitutes for any reason the problem of delay in processing the user's normal production, or poor quality of service will be held responsible supplier; Once the problem is resolved, the costs incurred, should identify the reason, The two sides discuss the settlement.

Solenoid Valve port into the line of attachment should be bottom-up access, not reverse, to prevent water damage to the components. If the cable must be top-down access, extension cable should be appropriate to ensure that port before entering the terminal there is a U-shaped bend. The rain will not enter the secondary Instrument. If you use threading pipe, U-shaped bend in the lower part should be left outlet. When the cable leads from the instrument cable tray, you should pay attention to threading pipe on the bridge interface in the direction of the nozzle must not be up; and should be sealed nozzle to eliminate the possibility of water.

Solenoid Valve type, material, and pipe connections and accessories selection, preparation of tender documents, bid evaluation, technical contract signing, installation, maintenance is a cumbersome and complex process, any part of a loophole are likely to affect Solenoid Valve use. Although there are a variety of books, standards and software for designers and users of information technology personnel, generally will not have much difficulty, but the officer from the process design parameters, Solenoid Valve for tender documents, tender issued , evaluation, technical clarification, the formation of evaluation reports, approval of evaluation reports, technical negotiations, signing of a technology contract to box inspection, installation, commissioning, and put into use, generally after a very long time, during which little effect on a will be missing one or more of negligence or may cause losses and affect plant projects. This article is only in times of Anhui Huainan Chemical Group Co., Ltd. Solenoid Valve procurement and use some experience and knowledge in a summary, the proposed procurement Solenoid Valve should have sufficient time, as long as technical conditions have to be in advance of tender documents preparation, evaluation, technical clarification, signed technology contracts, etc., really do careful and meticulous work of deep, less a technical fault. As for the progress of business contracts, and funds will have to progress under the Fiber Optic Splice Closure circumstances.

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