Needle valve works and installation precautions

Needle valve works: The role of any valve is to cut off the fluid. According to the different spool, can be divided into globe valve, gate valve, plug valve, ball valve, butterfly valve, needle valve and so on. Needle valve valve than other types of valves to withstand greater pressure, good sealing performance, it is generally used for smaller flow, high pressure gas or liquid medium seal. Needle valve type and pressure gauge with the most appropriate use of the general needle valve made of thread connections. Nominal pressure: PN2.5 PN4 PN6.4 PN16 PN32Mpa Nominal diameter: DN5 ~ DN25 Suitable medium: oil, water, gas and other non-corrosive or corrosive media Suitable temperature: -20 ℃ ~ +440 ℃ -70 ℃ ~ -240 ℃ ≤540 ℃ ≤570 ℃ Manufacturing materials: 20 #, 1Cr18Ni9Ti, 304, 316, 316L, 12Cr1Mov and so on. Needle Valve Installation Notes: 1) Installation location, height, direction of import and export must meet the design requirements, pay attention to the flow direction of the medium should be consistent with the direction of the arrow marked body, the connection should be firmly. 2) The valve must be installed before the appearance inspection, the valve nameplate should be consistent with the current national standard "General Valve Marking" GB 12220 requirements. For the working pressure is greater than 1.0 MPa and the main pipe to play the role of cut-off valve, the installation should be carried out before the intensity and tightness test, qualified after the standard use. Strength test, the test pressure of 1.5 times the nominal pressure, the duration of not less than 5min, valve housing, packing should be no leakage as qualified. Tightness test, the test pressure of 1.1 times the nominal pressure; test duration in line with the requirements of GB 50243. Anticorrosion valve needle method: First, the anti-corrosion of the valve body, the main choice is the correct material. Although the anti-corrosion information is very rich, but it is not easy to choose the right thing, because the problem of corrosion is very complicated. The difficulty of choosing the valve body material lies in that it can not only consider the corrosion problem, but also must consider the ability of pressure and temperature resistance, economically reasonable and easy to purchase and other factors. Followed by the lining measures, such as lead-lined, lined with aluminum, lining engineering plastics, lined with natural rubber and various synthetic rubber. This is a saving method if the media conditions permit. Third, in the pressure, the temperature is not high, the valve body with non-metallic materials, often very effective control of corrosion.

High-Mast Lamps Series

The High-mast Lamp is generally refers to the new lighting device which is composed of the steel taper light pole and the high power combination lamp frame of 15 meters or above.It consists of lamp holder, internal lamp, electric rod body and basic part.Lamp head modelling can according to user requirement, surroundings, lighting need specific and definite;The interior lamps are mainly composed of floodlights and projection lamps. The light source adopts NG400 high pressure sodium lamp, and the lighting radius is 60 meters.The bar body is usually a pyramid structure, which is made of steel plate, with a height of 15 to 40 meters, which consists of two to three sections.

Material characteristics

1. Beautiful appearance, large lighting area, good lighting effect, concentrated light, uniform illumination, small glare and easy to control and repair.

2. Applicable places: city square, station, wharf, highway, stadium, overpass, etc.

3. The lamp pole is a high quality steel plate by moulding into a multi - pyramid splicing steel rod, through hot galvanizing anti-corrosion treatment.

4. The lamp frame is made of high quality stainless steel.

5. Fasteners bolts and nuts are stainless steel.

6. Light source:400W-1000W sodium lamp.

Specifications:

Height: from 18m to 50 m

Suit for: highway, expressway, parkway, freeway, central motorway junction, truck and bus terminals, railyards, ship docks, airports, ferry terminals, prisons, industrial and commercial sites, international borders.

Shape: round, multi-pyramidal, column form, polygonal or conical

Material:

Q345B/A572,minimum yield strength>=345n/mm2
Q235B/A36,minimum yield strength>=235n/mm2

Tolerance of Dimension: ±2%

Lighting Source: 400 W- 5000 W high pressure sodium flood light, light extension :up to 30 000 m²

Light plate: Various figure of selection ,material with hot dip galvanization steel frame

Lifting System: Lifter fixed in the inner of the pole with lifting speed of 3~5 meter per minute
Equipped e; ant ferromagnetism brake and break -proof device, manual operation applied under power cut

Electric Appliance Control Device: Electric appliance box to be the hold of the pole ,lifting operation could be 5 meter away from the pole through wire .Time control and light control could be equipped to realize full-load lighting mode and part lighting mode

Surface treatment: Hot dip galvanized Following ASTM A 123, color polyester power or any other standard by client required.

Joint of Poles: Insert mode, inner flange mode, face to face joint mode .

Design of pole: Against earthquake of 8 grade

Wind Speed: 80 Km/Hour

Welding: We has past flaw testing. Internal and external double welding makes the welding in shape

Thickness: 6 mm to 20 mm

Production Process:
Raw material test→Cutting→Molding or bending →Welding (longitudinal ) →Dimension verify→Flangewelding→Hole drilling →Calibration →Deburr →Galvanization or powder coating, Painting→Recalibration→Thread→Packaging

Packages: Our poles as normal cover by Mat or straw bale at the top and bottom ,anyway also can following by client required

High-Mast Lamps Series,High Mast Lamps,High Mast Light,High Mast Light Pole

Jiangsu chengxu Electric Group Co., Ltd , https://www.chengxulightings.com