Wenzhou Nuoteng Electric Co.,Ltd

Wenzhou Nuoteng Electric Co.,Ltd

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Wenzhou Nuoteng Electric Co.,Ltd

Add: Malujiao industrial zone,Beibaixiang Town,Yueqing,Zhejiang,China

Contacts: Linder

Tel: 86-577-62968228

Fax: 86-577-62968228

Phone: 86-18858770469


Skype:cnsn_linder QQ:2512415425

Wechat: 18858770469

Valve Lockout Anti-aging Properties, Wear Resistance

First, the Valve Lockout specifications and categories, should meet the requirements of pipeline design documents

1, the Valve Lockout model should be marked according to the national standard number requirements. If the enterprise standard, should specify the relevant description of the model.

2, the Valve Lockout work pressure, requiring ≥ pipe work pressure, without affecting the price of the premise, the Valve Lockout can withstand the actual pressure should be greater than the actual pressure of the pipeline; Valve Lockout closed on any side of the conditions should be able to withstand 1.1 times the Valve Lockout workers Pressure, without leakage; Valve Lockout open conditions, the Valve Lockout body should be able to withstand double Valve Lockout pressure requirements.

3, the Valve Lockout manufacturing standards, should be based on the national standard number, if the enterprise standards, procurement contracts should be attached to the enterprise documents

Second, select the Valve Lockout material<br>

1, the Valve Lockout material, due to gray cast iron pipe is gradually not recommended to use, the body material should be dominated by ductile iron, and indicate the actual grade and casting physical and chemical test data.

2, stem material, and strive to stainless steel stem (2CR13), large diameter Valve Lockouts should also be stainless steel embedded package stem.

3, nut material, the use of cast aluminum brass or cast aluminum bronze, and the hardness and strength are greater than the stem

4, stem bushing material, its hardness and strength should not be greater than the stem, and in the case of water immersion and stem, the Valve Lockout body does not form electrochemical corrosion.

5, the sealing surface of the material ① different types of Valve Lockouts, sealing methods and material requirements are different; ② ordinary wedge gate Valve Lockout, copper ring material, fixed way, grinding methods should be described; ③ soft seal gate Valve Lockout, Of the physical and chemical and health test data; ④ butterfly Valve Lockout should be marked on the Valve Lockout body sealing surface material and butterfly plate sealing surface material; their physical and chemical testing data, especially rubber hygiene requirements, anti-aging properties, wear resistance; Nitrile rubber and EPDM rubber, etc., is strictly prohibited with recycled rubber.

6, the Valve Lockout shaft packing ① due to the pipe network in the Valve Lockout, usually open and close is not frequent, requiring the filler in a few years inactivity, packing is not aging, long-term to maintain the sealing effect; ② Valve Lockout shaft packing should also withstand frequent opening and closing , The sealing effect is good; ③ In view of the above requirements, the Valve Lockout shaft packing is not changed for more than ten years; ④ If the packing is to be replaced, the Valve Lockout design should consider the replacement of the water pressure.<br>

Third, the variable transmission box

1, box material and internal and external corrosion requirements and Valve Lockout body consistent.

2, the box should be sealed measures, the box can withstand the assembly of 3 meters after the water column soaking.

3, the box on the opening and closing limit device, the adjustment nut should be in the box.

4, the transmission structure design is reasonable, open and close can only drive the Valve Lockout shaft rotation, not to move up and down, the transmission parts bite appropriate, do not produce the load and opening and closing when the separation slip.

5, variable speed transmission box and Valve Lockout shaft seal can not be connected into a leak-free as a whole.

6, no debris inside the box, gear bite parts should be grease protection.

Fourth, the Valve Lockout operating mechanism

1, the Valve Lockout operation of the opening and closing direction, should be closed clockwise.

2, due to the pipe network in the Valve Lockout, often manual opening and closing, opening and closing the number of revolutions should not be too much, that is, large diameter Valve Lockouts should also be in the 200-600 turn.

3, in order to facilitate a person's opening and closing operation, in the pipeline pressure conditions, the maximum opening and closing torque should be 240m-m.

4, the Valve Lockout opening and closing operation should be square tenon, and the size of standardization, and facing the ground, so that people can operate directly from the ground. Valve Lockouts with roulette are not suitable for underground pipe networks.

5, the degree of Valve Lockout opening and closing the display disk<br>

① Valve Lockout opening and closing degree of the scale line, should be cast on the gearbox cover or change the direction of the display panel after the shell, all facing the ground, the scale line brush on the phosphor to show eye-catching; ② instructions needle material in the management Better use of stainless steel plate, otherwise painted steel plate, do not use aluminum production; ③ instructions needle eye, fixed firmly, once the opening and closing adjustment is accurate, should be locked with rivets.<br>

6, if the Valve Lockout is buried deep, the operating mechanism and display plate from the ground distance ≥ 15m, should be equipped with extension rod facilities, and fixed firmly, so that people from the ground observation and operation. In other words, the pipe network in the Valve Lockout opening and closing operation, should not go down to work.

Fifth, the Valve Lockout performance testing

1, a certain size of the Valve Lockout manufacturers should be commissioned by the authority of the following properties of the following tests: ① Valve Lockout pressure in the working conditions of the opening and closing torque; ② in the pressure conditions, to ensure that the Valve Lockout closed tight continuous opening and closing times ; ③ Valve Lockout in the pipeline under the conditions of water flow resistance coefficient detection.

2, the Valve Lockout in the factory should be the following detection: ① Valve Lockout in the open state, the Valve Lockout body should withstand the pressure of the Valve Lockout pressure twice the internal pressure detection; ② Valve Lockout in the closed condition, both sides were 11 times the pressure Value, no leakage; but the metal sealed butterfly Valve Lockout, leakage value is not greater than the relevant requirements<br>

Six, the Valve Lockout inside and outside the anti-corrosion

1, the Valve Lockout body (including variable speed drive box) inside and outside, the first shot should be clear sand rust, and strive to electrostatic powder powder non-toxic epoxy resin, the thickness of 0-3mm above. Extra large Valve Lockout electrostatic spraying non-toxic epoxy resin is difficult, it should also brush, spray similar non-toxic epoxy paint.

2, the Valve Lockout body and the various parts of the Valve Lockout plate requires a comprehensive anti-corrosion, on the one hand soaked in water will not rust, between the two metals do not produce electrochemical corrosion; two surface smooth water resistance to reduce.

3, the body of anti-corrosion epoxy resin or paint the health requirements, should have the appropriate authority of the test report. Chemical and physical properties should also meet the relevant requirements.

Seven, the Valve Lockout packaging transport

1, the Valve Lockout should be set on both sides of a lightweight block solid seal.

2, medium and small diameter Valve Lockouts should be bundled with straw rope, and transport to the container is appropriate.

3, large-caliber Valve Lockout also has a simple wooden frame fixed packaging, so as not to damage during transport

8, check the Valve Lockout factory instructions

1, the Valve Lockout is the equipment, in the factory instructions should be marked with the following relevant data: Valve Lockout specifications; model; work pressure; manufacturing standards; Valve Lockout body material; stem material; sealing material; Valve Lockout shaft packing material; stem sleeve material; Internal and external anti-corrosion material; operation start direction; speed; working pressure under the opening and closing torque;

2, the factory name; factory date; factory number: weight; connecting flange diameter, number of holes, the central hole from the way to indicate the overall length, width and height of the control size; effective opening and closing times; Resistance coefficient; Valve Lockout factory inspection of the relevant data and installation, maintenance and other considerations.

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