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valve routine maintenance

1, the valve should be kept dry and ventilated room, access to be blocked at both ends.

2, long-term storage of the valve should be checked regularly to remove dirt, rust and oil-coated surface in the process.

3, after installation, should be regularly checked, the main inspection items:

(1) sealing surface wear.

(2) trapezoidal stem and stem nut thread wear.

(3) packing is outdated, should be replaced if damaged.

(4) repair the valve assembly, sealing performance test should be carried out.

valve greasing maintenance work

before soldering operation of the valve before and after the commissioning of professional conservation work for the service valve manufacturing operations play a vital role in the correct and orderly and effective maintenance will protect the valve, the valve normal valve function and prolong life. Valve conservation appears to be simple, it is not. Work is often overlooked aspect.

First, valve grease, it is often overlooked issue of the amount of grease. Grease gun, after refueling, the operator selects the valve and connected after the manner of grease, the grease job. There are two cases: on the one hand greasing less grease less sealing surface is accelerated wear due to lack of lubricant. The other hand, excessive grease, resulting in waste. Is no basis for the type of valve type, valve sealing capacity of different accurate calculations. Can be calculated valve size and type of sealing capacity, and then injected into a reasonable amount of grease.

Second, the valve grease, often ignored problem of stress. In the greasing operation, the grease pressure peak was regularly changed. Pressure is too low, seal leakage or failure, the pressure is too high, greasing port plug, sealing ring and the inner lipid hardening or valve ball, valve plate locking. Usually the grease pressure is too low, the injection of grease into the valve chamber more than the bottom, generally occurs in the small gate. The grease pressure is too high, while checking the grease nozzle, in the case identified the grease hole blocking situation to be replaced; the other hand, lipid-hardening, to use the cleaning fluid, repeated failure to soften the sealing resin, and grease into the new replacement . In addition, the seal type and seal materials also affect the grease pressure, different forms have different sealing grease injection pressure, in general, seal the grease pressure is higher than the soft seal.

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Third, the valve greasing, pay attention to the valve problem in the switch position. Valve maintenance are generally in the open position when the state of maintenance of special circumstances, choose to close. Other valves can not be any open spaces punished. Valve must be in conservation when turned off, to ensure full of grease seal ring groove along, if the open position, sealing resin flow channel or directly fall into the valve chamber, resulting in waste.

Fourth, the valve greasing, the grease effect is often ignored problem. Operation pressure grease, grease, switching position are normal. However, to ensure that the valve greasing effect, and sometimes need to open or close the valve, on lubrication check to make sure the ball valve or gate valve surface lubrication evenly.

fifth, greasing, pay attention to the pressure relief valve and blanking plug with sewage problems. Pressure test the valve, seal chamber and the valve chamber gas temperature and moisture boost for the environment, greasing to conduct sewage pressure relief, in order to facilitate the smooth progress of the work greasing. After greasing the seal cavity is full replacement of air and moisture out. Time to vent out the valve cavity pressure, but also to protect the use of safety valves. After greasing, be sure to tighten the wire blocking drainage and pressure relief to prevent accidents.

Sixth, greasing, the grease evenly to pay attention to the problem. Normal greasing, the grease from the grease out of the hole nearest the mouth, first-out fat, and then to the low end is the high point, successive out fat. If you do not follow the law or no fat, prove the existence of congestion, timely and clear communication process.

seventh, greasing also observed diameter valve seat ring flush with the problem. For example, ball valve, open spaces if there is interference, can be adjusted to the open position limit switch inside, confirm and lock straight path. Adjustment limit is not only the pursuit of a party on or off position, to the overall consideration. If the open position flush off place, will cause the valve off lax. Similarly, adjusting the relations in place, we must consider the open position accordingly. Ensure that the right-angle valve travel.

eighth, grease, the grease will seal the mouth. Avoid impurities into, or greasing the mouth lipid oxidation, capping to apply anti-rust grease to avoid rust. Applications for the next operation.

ninth, greasing, but also consider the order in the next oil delivery in specific issues and problems. Given the quality of diesel and petrol, gasoline should be considered erosion and decomposition capability. Valve operation in the future, encountered gas segment operations, replenish grease to prevent wear and tear occurs.

Tenth, grease, do not ignore the stem part of the grease. Parts of a sliding sleeve valve shaft or packing, but also the need to maintain lubrication to reduce friction during operation, if not to ensure lubrication, the electrical torque increase when worn parts, manual operation switch effortlessly.

eleventh, some marked with an arrow on the valve body, if not with English FIOW writing, for the sealing seat role in the direction of the flow of information not as a medium, since the vent valve in the opposite direction. Typically, two-seater with two-way flow valve seal.

XII, valve maintenance, also pay attention to the first and the transmission of electric water problems. Infiltration of rainwater, especially during the rainy season. First, the transmission or drive shaft cover rust, and second, the winter freeze. Caused by electric valve operation torque is too large, no-load damage to transmission components or super torque motor would jump to protect electric operation can not be achieved. Damage to transmission parts, manual operation can not be. After the action in the ultra-torque protection, also can not switch to manual operation, such as the forced operation, the damage to the internal alloy components.

summary, valve maintenance, truly scientific attitude in order to make the valve maintenance work to achieve the desired effect and application purposes.

1, size limits
INA bearings can be installed

usually the space is restricted. In most cases, the shaft (or INA bearing diameter) is based on mechanical design or other design limitations. Therefore, INA Bearing type and size selection is based on the diameter of INA bearings and decide. Thus, the standard size of INA bearings of the main table are based on international standards prepared by diameter size.

2, speed

permissible speed is based on the type of INA bearings, size, precision, cage type, load, lubrication, and cooling method and other factors identified. Table lists the INA Bearing INA Bearing in standard precision oil lubrication and grease lubrication of the allowed speed. Typically, deep groove ball bearings INA, self-aligning ball bearings and cylindrical roller INA INA bearings are suitable for high speed applications.

3, INA Bearing tolerance

INA Bearing size precision and rotational accuracy is based on ISO and JIS standards. For applications requiring high precision and high speed machinery, recommended five or more precision INA bearings, deep groove ball INA bearings, angular contact ball bearings or cylindrical roller INA INA bearings are suitable for high precision mechanical operation. Rigidity, when the INA rolling bearings and roller contact surface pressure, will produce elastic deformation. Some machines need to minimize elastic deformation. Than ball bearings INA roller bearings produced by INA small elastic deformation.

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4, installation and removal

some applications require frequent removal and installation, to ensure regular testing and maintenance. Can be installed inside and outside the ring, such as the INA bearings: cylindrical INA bearings, needle bearings INA, and INA bearings are tapered for this.

valve’s primary role is used to quickly switch the fluid. Because the handle rotated ninety degrees to achieve the full effect of all relevant, it is also called “quick-opening.” Because the switch is not easy to accurately adjust the degree of control, so not suitable for flow regulation.

ball is a sphere with a circular channel to open and close parts, ball rotation to achieve with the stem of the valve opening and closing action. Valve open and close a hole in the piece is a sphere around the axis of rotation perpendicular to the channel, so as to achieve the purpose of opening and closing the channel. The main valve for opening and closing of media channels and equipment used.

valve main advantages are as follows:

for the regular operation, open and close quickly, lightweight.

1. fluid resistance.

2. structure is simple, relatively small size, light weight, ease of maintenance.

3. seal.

4. is not limited mounting direction, the flow of the medium can be any.

5. no vibration, noise.
The main drawback

valve as follows: valve structure can be classified according to: floating ball valve, fixed ball valve, ball valve and flexible seal valve; per channel can be divided into direct-to-type, angle-and three-way etc., can be divided into three-way T-shaped and L-shaped two. Work can be divided according to the connecting threaded connection, flange connection and welded three.

valve installation and maintenance should note the following:

1. to leave the position of the valve stem rotation

2. can not be used for throttling.

3. with vertical transmission of the valve should be installed.

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Although this noise is essentially a result from manufacturing errors, but in fact still with the choice of lubricant, bearing installation conditions, the accuracy of shaft and bearing on the state. This noise is further divided into cage sound of two types of sound and vibration pattern, as described below:

(1) sound and control cage

cage sound is intense vibration of the cage and rolling elements have been issued for the impact of periodic vibration and noise, the hole in the pocket loose and prone to large friction.

This noise occurs mainly in ball bearings and tapered roller bearings, and stamping cage and solid cage occurs, the use of grease or oil lubrication lubrication occurs, but in poor lubrication or lubricant dried up, the large radial clearance, the outer ring under a moment load, and poor cage structure and accuracy is not high, the more likely, the web or cage severe rivet head will suddenly break.

cage noise and vibration control methods are; good lubricant to use lubrication; reduce the bearing installation error; compressed radial bearing axial clearance or preload to be appropriate, and use well-structured with reasonable accuracy cage bearings, or switch to cage firmly and without the wear and tear of bearings.

(2) sound and vibration pattern control method

chatter sound is directly related to the bearing surface waviness on rolling noise, which is a pure tone noise, the constant speed, its frequency is also constant, and for changes in speed, it also will be the frequency of change.

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1, PGL AC low-voltage distribution cabinet series indoor installation with double-sided open-type low-voltage power distribution equipment maintenance, the basic structure of a thin steel plate and angle iron welded using a combination of simple structure, convenient maintenance;

2, between the screen and screen installation made by the partition plate bending, reduce the failure within a single screen may be caused by expansion of the accident;

3, display shelves and insulated box mounted on the main bus on the bus and is equipped with protective cover, to prevent the top of the metal pieces falling short circuit caused by the main bus accident.

4, PGL AC low-voltage distribution cabinet open and closed sub-two, double-sided maintenance. Hybrid welding steel plate with angle from, the surface side of the dashboard screen, plus the interval partition, with the top of the bus skeleton frame, fitted busbar shields, welding N, PE contacts. According to customer requirements or the size of the installation of the back door side.

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solenoid valve is used to control the flow direction of the base of automation components, is the actuator; commonly used in machinery and industrial control valves used to control the direction of the media, so as to achieve the control valve solenoid valve switch works:

closed solenoid valve in a cavity, in different locations have opened a hole, each hole is leading to a different pipeline, the middle of the valve chamber, two is two electromagnets, which side of the magnet coil power body will be attracted to which side, through the control valve to block the movement of an oil discharge or leakage of different holes, and into the oil hole is always open, the hydraulic oil pipeline will enter a different row, then the oil pressure to push the piston cylinder, piston and piston rod driven, piston rod drive mechanism movement. This electrical flow through the control solenoid on-off control of the mechanical movement.

currently used steam solenoid valve, usually over the following two steam:

1, boiler steam – saturated steam temperature and pressure is relatively stable at temperatures below 250 ℃, working pressure lower than 1.6Mp. Valve Manufacturing Co., Ltd. Shanghai Star Ou usually use a soft seal steam solenoid valve as follows:

structural features: This valve is a valve and main valve, vice two parts consisting of the second pilot valve solenoid valve to open.

heat: electromagnetic part, some with special high temperature seals and sealing materials, electrical materials, and apply a variety of insulation measures.

wear: rational selection, valve cup and guidance suites clever use of fluid lubrication, reducing wear and improve life.

resistance to condensation: steam condensate pipe steam solenoid valve action affecting an important factor, the condensed water valve is not affected.

other uses – soft seal

steam solenoid valve

This series solenoid valve can be widely used in textile, printing, chemicals, plastics, rubber, pharmaceutical, food, building materials, machinery, appliances, surface treatment and research departments as well as bathrooms, cafeteria, air conditioning control system.

2, thermal power plant out of steam – superheated steam temperature and pressure changes in a high base, the temperature up to 400 or more, the working pressure is less than 4.0Mpa. Usually use seal of steam solenoid valve as follows:

structural characteristics: the use of metal seal, increased use of the product temperature and lifetime.

selection is reasonable, the valve cup and guidance suites clever use of fluid lubrication to reduce wear and tear.

other purposes – seal the steam valve wide range of media the generic product can be used separately in water, light oil, heavy oil, non-corrosive gas and steam fluid. Such as power plant exhaust pipe drainage system and the evaporator exhaust system, mainly in the pipeline for two-position automatic adjustment of the media and remote control.

working condition: normally closed type – power on, power off normally open type – power on, power off.

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LQ Series colloid pump – also known as vacuum pumps, stainless steel rotor pump, cam pump, universal pump, yeast pumps, butterfly pump, trefoil pump, sole pump, drug pump material, hot-melt colloid pump, colloidal particles pump, pump slag, slag pump protein, high concentration of pump, etc., depend on two simultaneous counter-rotation of the rotor during rotation generated in the inlet suction (vacuum), which transport the material to be inhaled. Separate the two rotors the rotor chamber a few small space, according to the order abcd operation; operation to a location, only I room full of media; to position b,, B room closed part of the media; to position c, A- room also closed some of the media; to position d,, A, B and II Room Room interlinked, both media being transported to the discharge port.

LQ Series colloid pump features:

1, where the medium (material) contact parts are made of stainless steel (material SUS304, AISI316, 316L) full compliance with health standards.

2, for transport of high viscosity, concentration, and any containing particles of the medium (material).

3, suitable for temperatures -30 to +200

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valve should be kept dry and ventilated

interior, access to be blocked at both ends. long-term storage of the valve should be checked regularly to remove dirt, ball valves and pneumatic plastic surface coated with anti-rust oil processing. Pneumatic Plastic Ball Valve installation, you should be checked regularly, mainly to check: seal face wear. Trapezoidal stem and stem nut thread wear. Filler is outdated, should be replaced if damaged. Valve repair assembly, sealing performance test should be carried out. Valve must be in conservation when turned off, to ensure full of grease seal ring groove along, if the open position, sealing resin flow channel or directly fall into the valve chamber, resulting in waste. Valve maintenance are generally in the open position when the state of maintenance of special circumstances, choose to close. Other valves can not be any open spaces punished.

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ball cage has several disadvantages. First, the valve size is limited (usually 16 inches) Second line of sight with the same size valves (such as a ball valve or butterfly valve) compared to the third volume is relatively low priced high, especially large-diameter The cage ball. However, to reduce process variability, the cage-ball valve with superior performance, often enough to make up for these deficiencies.

rotating ball valve flow diameter than the same large cage ball. Although the control of rotation is greater than the float valve cage ball, but still better than most other types of valves. Rotating ball valve to allow pressure to drop and allow the valve temperature range than the small cage. Pressure drop is usually their maximum 7.0x105kg/m2, suitable for temperatures below 398 ℃ to suit the occasion. Easy to play the float valve does not apply to liquid vacuoles, and in the higher pressure drop for gas, it is often possible to issue a large noise.

float valve eccentric valve friction than smaller, less expensive. Unique structure designed to control for more accurate flow volatility. This new product from Fisher’s BV500 is evident. In addition, the advantages and disadvantages and eccentric valve float valve or less.

measured by the performance of the valve, butterfly valve are low valve. Butterfly valve flow, the cheapest price, and a variety of different caliber. However, the butterfly valve characteristic curve characteristic curve proportional only one, which greatly limits the butterfly valve to reduce process variability performance. For this reason, butterfly valves can only be used for load fixed occasions. Although the butterfly valve has many different caliber, and can be used to manufacture most of cast alloy, but butterfly valves do not meet ANSI requirements for face to face dimensions, does not apply easily from noisy cavity fluid or other occasions .

sum up, in fact, the dynamic characteristics of control valve and static characteristics are equally important, even more important than the static characteristics, because it can better determine whether this valve site conditions meet the requirements, so for us to elect more suitable for on-site conditions to the control valve, which requires manufacturers and users in close communication can be achieved.

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high gear pump caused due to corrosion and mechanical seal failure:

a) sealing surface pitting, and even penetrate. b) As the tungsten carbide ring with stainless steel base, such as welding, stainless steel seat and easy to use in the intergranular corrosion; c) welded metal bellows, springs, etc. and the media in the stress corrosion the joint action of rupture-prone.

effects arising due to high temperature mechanical seal failure:

a) high-temperature thermal cracking is a gear pump, oil pump, such as slag, back to the refinery pumps, atmospheric and vacuum tower bottom pump failure, etc. The most common phenomenon in the sealing surface as dry friction, sudden interruption of the cooling water and impurities into the sealing surface , taking the time and other circumstances, would lead to the torus radial cracks appear; b) carbonization is the use of carbon graphite – graphite ring seal failure when one of the main due to the use, if the graphite ring once more than the allowable temperature (usually at -105 ~ 250 ℃), its surface will precipitate the resin, the resin will occur near the friction surface carbonization, when the binder, it will soften the foam, so that the sealing surface leakage increases, seal failure; c) auxiliary seals ( such as fluorine rubber, ethylene propylene rubber, all rubber) over allowable temperature will rapidly aging, cracking, loss of playing hard and now uses flexible graphite high temperature, good corrosion resistance, but its resilience poor. and easy to rattle, easily damaged during installation.

seal face wear as a result of seal failure:

a) friction materials used in poor wear resistance, friction coefficient, face pressure (including spring pressure) is too large, will shorten the service life of mechanical seals. For commonly used materials, arranged according to wear order: silicon carbide – carbon graphite, carbide – carbon graphite, ceramic – carbon graphite, ceramic coating – carbon graphite, silicon nitride ceramic – carbon graphite, high-speed steel – carbon graphite, carbide welding – carbon graphite. b) For media containing solid particles, the sealing surface into the solid particles is the main reason leading to seal failure of solid particles from the abrasive face into the role of friction, so that the sealing occurrence of severe wear and failure. a reasonable gap sealing surface, and the balance of mechanical seals, as well as seal faces are all caused by flash liquid film leaving the solid particles into the open end of the main reasons. c) the balance of the mechanical seal β also affect the seal wear. In general, equilibrium of β = 75% or so the most appropriate. β <75%, although reduced wear, but the leakage increases, the possibility of increasing the sealing surface open for High load (high PV) of the mechanical seal, due to face a larger friction heat, β generally take 65% to 70% is appropriate for low-boiling hydrocarbon media such as the gasification temperature is more sensitive to the media, in order to reduce frictional heat effects, β take 80% to 85% as well.

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for installation, operation, or errors generated by the device itself caused by mechanical seal leakage:

1) As bad installation, resulting in mechanical seal leakage, mainly in the following aspects: 1) dynamic and static ring contact surface uneven, bumps during installation, damage; 2) dynamic and static seal ring size is wrong, damaged or not pressed; 3) dynamic and static ring surface of a foreign body; 4) static and dynamic V-ring seals against the direction of loading, or when the anti-side installation; 5) sleeve leak, or pressure seals are not installed clamping force is not enough; 6) spring force uniform, single spring is not vertical, multi-spring of different lengths; 7) with the axis perpendicular to the seal chamber face is not enough; ring on the sleeve of corrosion activity at the point.

2) equipment operation, mechanical seal leak causes are: 1) gear pump impeller axial movement than standard shaft vibration and process operations occur periodically unstable, constantly changing seal cavity pressure etc lead seal periodically leaks; 2) friction can run together without damage or deformation caused by leakage; 3) inappropriate choice of seal materials, swelling loss of bombs; 4) large spring turned to right; 5) devices running too much vibration; 6 ) dynamic and static scale formed between the ring and sleeve so that the spring can not compensate for loss of elastic sealing surface of the wear and tear; 7) sealing ring cracked and so on.