The pipes supplying gas to the stove must be equipped with an individual tap, which serves to shut off the gas supply in the event of a leak or malfunction of the gas stove. The gas valve requires constant monitoring and timely maintenance. If a faucet malfunction is detected, an urgent replacement of the device is required.
Selection of gas valves
If a malfunction is detected in the operation of the gas valve, it is recommended to replace the device as soon as possible. First of all, you need to select a new valve. When choosing, experts recommend considering:
- type of valve;
- basic device parameters.
Kinds
The gas pipe valve can be:
- cork. The body of the plug valve contains a conical element driven by a flywheel. There is a hole in the conical element (plug), which, when combined with a hole in the pipe, allows gas to flow to the equipment. The seal acts as a sealing material that seals the connection between the faucet and the pipes;
- spherical The design of a ball-type gas valve differs from a plug valve in that the locking mechanism is based on a ball made of durable metal. The ball has a hole, which, when the flywheel is turned, is located along the gas pipeline and in this way passes gas to the consumer.
According to the method of connection to pipes, a household ball valve can be:
- threaded The valve is connected to the gas pipeline pipes with a threaded connection;
- flanged. The connection to the pipes is made using flanges, which in turn are fixed with bolts;
- welded, that is, installed using a welding machine.
Threaded and flanged valves are reusable, that is, if necessary, you can remove the device from the gas pipe, check its functionality, carry out repairs and install it in its original place. The welded valve can only be installed once.
Basic selection parameters
To select a gas shut-off valve, it is recommended to pay attention to the following factors:
- pipeline diameter. The shut-off element of the valve must completely block the pipe in the apartment. If the valve is larger or smaller, the tightness of the tap will not be complete;
- pitch and diameter of the thread on the pipeline. To quickly replace the device, it is necessary that the specified parameters completely match. Otherwise, you will need to purchase and install additional adapters;
- the material from which the gas pipeline valve is made. It is more advisable to purchase brass taps, as they have a longer service life. You can also find silumin, zinc and plastic taps on sale. You can distinguish the material used to make the valve by weight. Brass faucets are heavier than faucets made from other materials. In addition, you can inspect the place where the thread is cut. Brass has a yellow tint, and all other materials (except plastic) are gray;
- The valve body must be free of chips, sagging, cracks and other defects. The presence of these factors indicates non-compliance with the rules for manufacturing the product, which will lead to a reduction in service life;
- It is more advisable to purchase valves from well-known manufacturers. For example, you can choose cranes manufactured by Bugatti (Italy), Dungs (Germany), Broen Ballomax (Poland).
Following simple rules when choosing a gas valve will allow you to choose a reliable device with a long service life.
Gas valve installation
Preparatory stage
To change the gas valve in the kitchen yourself, you need to prepare:
- new tap;
- two gas keys. One wrench is required to unscrew the threads, and the second to hold the down tube stationary. Otherwise, the pipeline leading directly to the gas stove may be damaged;
- means for sealing threaded connections. FUM tape, Tangit Unilok thread or regular linen thread are suitable. When using linen thread, additional treatment of the sealing material with paint is necessary;
- graphite lubricant intended for gas valves;
- for pipe. If you replace the valve together, you can do without using a plug.
Replacement process
The gas valve is replaced according to the following scheme:
- the gas supply to the living space is cut off. To do this, the gas valve handle is turned to a position perpendicular to the pipe;
- the valve is unscrewed from the pipe. If you cannot unscrew the thread, it is recommended to treat the threaded connection with WD-40, which will ensure smooth operation. If a welded valve is installed in the apartment, then it is cut off using a grinder, and on pipes;
- A temporary plug is installed in place of the valve. If the work of replacing the gas valve is carried out by two people, then instead of the plug you can use your partner’s finger. This procedure will facilitate the process of installing a new faucet;
- a sealing thread is screwed onto the thread;
- a layer of graphite lubricant is applied on top of the thread;
- A new faucet is being installed.
The process of replacing a gas valve yourself is presented in the video.
- open the tap and start supplying gas to the stove;
- prepare a saturated soap solution, which is applied to the tap and connection points.
If the device and threads allow gas to pass through, small soap bubbles will form at the leakage site. If a leak is detected, the problem must be corrected quickly.
Doing the job of replacing a gas valve yourself is risky. Any careless action or violation of safety regulations may result in an explosion. Therefore, it is recommended that replacement be carried out by qualified personnel.
MINISTRY OF EDUCATION OF THE SARATOV REGION
state autonomous professional educational institution
Saratov region
"Saratov College of Architecture and Civil Engineering"
I APPROVED
Deputy Director of Academic Affairs
______________
"____"____________2015
PM.04 Performing work on one or more
workers' professions, office positions
18554 Fitter for operation and repair of gas equipment
specialty 02/08/08 Installation and operation of equipment and gas supply systems
for full-time and part-time students
Saratov, 2015
Developer
A.A. Yurenko, teacher of special disciplines at GAPOU SO "SASK", first qualification category
Explanatory note
4
Introduction
5
1
Gas tap maintenance
6
1.1
Preparatory work
6
1.2
Necessary tool
7
2.
Inspection process of a plug cone coupling valve
8
3.
The inspection process of a plug cone tap through tension
15
4.
Results of the work done
22
5.
List of used literature and resources
23
Explanatory note
The study of professional module 04 “Performing work in one or more professions of workers, positions of employees” MDK 04.01 Technology of work on the operation and repair of gas equipment, provides for the study of a theoretical course, the purpose of which is to master the specified type of professional activity and the corresponding professional competencies:
PC 4.1. Perform work on disassembling and assembling gas fittings and equipment.
PC 4.2. Carry out repair work on gas supply systems of residential buildings and household consumers.
PC 4.3. Install and maintain household gas appliances and equipment
PC 4.4. Carry out work on commissioning and starting gas into household gas appliances
This guideline discusses theoretical material on the following topic:
Topic 1.2. Technology of procurement work
The topic material covers the question:
Grinding in plug valves manually and using special devices.
At the end of the document there is a list of references and online resources.
Introduction
Methodological recommendations for the maintenance of gas plug valves are intended to obtain primary professional skills in plumbing; master the skills and abilities to perform work related to the maintenance of gas plug valves.
The recommendations include the following materials: equipment, devices, tools and materials used in the performance of work; revision of a plug cone coupling valve; revision of the tension plug cone valve.
The methodological development will allow you to quickly gain knowledge on the practical training of gas mechanics and qualitatively prepare for the test in educational practice.
Designed for 1st year students of the specialty 02/08/08 “Installation and operation of equipment and gas supply systems”
1. Gas tap maintenance
A positive feature of Soviet gas taps is their long service life and maintainability. However, such a faucet requires regular maintenance, since the tightness of such a device is ensured by grinding the faucet plug to the body; read more about this in our article.
The appearance of a gas smell in the area of the plug valve is not a reason to replace it, but you will still have to call a gas service representative to eliminate the cause of the leak.
This manual describes step by step the process of revising the two most popular gas plug valves: coupling and tension. Please note that this article is not a call to action, but is offered solely for informational purposes, since gas-hazardous work must be carried out by specialized organizations that have the necessary permits. It will be useful to those who want to personally verify the quality of the tap inspection performed by the gas service.
1.1 Preparatory work
Before you begin inspecting the gas tap, you need to find out whether the tap is actually the source of the leak. To do this, you need to wash the tap by applying foam to the connections. We find places where gas is leaking to make sure that the valve is indeed the cause of the leak.
Note. The hose leading to the gas equipment was specially removed to show that a gas leak from the outside very often means that the tap itself is leaking. Therefore, the options of lubricating the case with lubricant on the outer surface, sealing it with plasticine and other traditional methods do not completely solve the problem, but only create the illusion of safety.
To carry out an inspection, there is no need to remove the gas valve from the gas pipeline. In this article, this is done solely for clarity of the process. However, it is necessary to shut off the gas supply to the gas pipeline and relieve the pressure, and also warn neighbors so that they turn off all gas-consuming appliances!
1.2 Required tools
To perform the audit you will need the following tool:
wide flat screwdriver
open-end wrench No. 17
lubricant for gas valves
rags
Note. In the absence of a special gas lubricant, it can be completely replaced with graphite lubricant. It is undesirable to use solid oil, since its properties are highly dependent on temperature.
2 Inspection process of a plug cone coupling valve
Use a flat-head screwdriver to unscrew the screw plug.
[Download the file to see the picture]
We take out the spring.
[Download the file to see the picture]
Use a flat-head screwdriver to slightly turn the tap plug, pressing on it. Use the finger of your other hand to hold the plug. When it jams, you can tap the screwdriver a little with a hammer.
[Download the file to see the picture]
Note. Do not damage the inner surface of the faucet with a screwdriver and do not drop the plug to avoid scratches and nicks!
We take out the plug.
[Download the file to see the picture]
[Download the file to see the picture]
We wipe the faucet body and plug with a rag. Dried grease can be removed with gasoline or alcohol.
[Download the file to see the picture]
[Download the file to see the picture]
Using a screwdriver, remove the remaining old grease from the plug.
[Download the file to see the picture]
Apply a thin layer of lubricant to the plug.
[Download the file to see the picture]
Place the lubricated plug into the housing.
[Download the file to see the picture]
We fill the grease into the cavity where the spring is located.
[Download the file to see the picture]
Place the spring in the groove of the plug.
[Download the file to see the picture]
Lubricate the threaded plug and screw it into the housing several turns with a screwdriver. The spring should fit into the groove on the plug.
[Download the file to see the picture]
[Download the file to see the picture]
By tightening the screw plug with a screwdriver, we adjust the smoothness of the tap. We check by turning the plug with a screwdriver. The tap should not turn with force, but it should not move too easily.
[Download the file to see the picture]
3. The process of auditing a plug taper taper through tension
Holding the tap plug with a handle, use the 17th key to unscrew the locknut and the nut in turn.
[Download the file to see the picture]
[Download the file to see the picture]
Remove the limit washer.
[Download the file to see the picture]
We press our finger on the pin of the cork, turning the cork with a handle. When the plug jams, you can lightly tap the stud with a hammer, after screwing the nut onto it first, so as not to damage the thread. You need to hit the nut!
[Download the file to see the picture]
We take out the plug.
[Download the file to see the picture]
[Download the file to see the picture]
Cleaning the plug and body, followed by lubrication and assembly, is carried out in the same way as a coupling valve. We clean the restrictor washer from old grease.
[Download the file to see the picture]
Apply lubricant to the valve body where the limiting washer meets.
[Download the file to see the picture]
We put the limiting washer on the groove of the stud. To do this, place the tap plug in the half-open position.
[Download the file to see the picture]
[Download the file to see the picture]
[Download the file to see the picture]
Screw the nut through the slot onto the faucet plug.
[Download the file to see the picture]
[Download the file to see the picture]
By tightening the nut, we adjust the degree of tension of the tap. We check by turning the tap handle. The tap should not turn with force, but it should not move too easily. We tighten the locknut.
[Download the file to see the picture]
Once again we check the smoothness of the ride.
4. Results of the work done
After gas supply and control washing, no gas leaks were detected! The faucet is sealed and works much more pleasantly, without jamming!
[Download the file to see the picture]
5. List of used literature and Internet resources
K.G.Kazimov., V.E.Gusev. “Operation and repair of gas supply system equipment”
A practical guide for a gas mechanic. - M.; IC ENAS, 2006;
Pokrovsky B.S. Basics of plumbing: textbook / B.S. Pokrovsky. – 2nd ed., erased. – M.: Academy IC, 2009
http://www.club-gas.ru
13PAGE 142315
Attached files
Tap– a shut-off device in which the movable part of the valve (plug, ball) has the shape of a rotating body with a hole for passing the flow, to close which it rotates around its axis.
Plug taps
The term “plug valve” also refers to ball valves, but for simplicity, only conical (cone-shaped plug 8-10 0) and cylindrical valves are usually called plug valves.
Plug valves consist of: a body, a plug that has horizontal and vertical annular grooves for lubrication, a spindle, a control lever, a valve position indicator, a lever travel limiter, a check valve with lubrication, a clamping bolt, and a lower flange. To close the tap, use a lever to turn the plug 90 0 .
Plug taps Du above 100mm have gearboxes to reduce the load at the time of closing or opening.
The positive qualities of a plug tap include the simplicity of its design. The disadvantage is the high hydraulic resistance, since the plug has a flow area that is 25-30% smaller than the nominal diameter of the connection pipes. This negatively affects the cleaning of the cavity of the installed gas pipeline, and during operation, hydrate may form in the shut-off units.
Ball Valves
Ball valves differ from others in their simplicity of design; the body and ball have smaller overall dimensions and weight, as well as greater strength.
The advantages of ball valves also include a fireproof design, which provides for closing the valve in the event of a fire. The manufacture of these taps is less labor intensive. In ball valves with plastic rings, there is no need to grind in the sealing surfaces. The ball is usually chromed or polished.
Training Guide for Preparation
workers in production
Workshop on plumbing work
Lapping of conical mating surfaces
In addition to lapping parts using laps, lapping the mating surfaces of parts directly to one another is also used. Such work includes grinding in various taps and valves, where a tight fit of conical surfaces is required.
The conical surfaces of the tap (plug and seat) are pre-processed on a lathe, after which they are subjected to grinding. Grinding in of the brass valve plug is performed in the following sequence.
1. The surfaces to be ground are cleaned of dust, dirt and wiped dry.
2. The valve body is clamped in a vice with the large conical hole facing upward.
3. An even layer of GOI paste (medium), diluted in kerosene, is applied to the conical surface of the cork.
4. The cork is inserted into the conical socket, and a knob is placed on the square of the cork axis.
5. The driver with the plug is subjected to a reciprocating circular motion with axial pressure (Fig. 248). In this case, after a half turn in one direction, the cork is lifted, then lowered and, with light pressure, turned half a turn in the other direction.
Rice. 248. Technique for lapping the conical plug of the bushing tap
6. After making eight to ten such movements, remove the plug from the valve body, wipe all the surfaces to be ground dry and check the quality of the grinding.
7. An even layer of paste is applied to the surface of the cork a second time and the grinding techniques are repeated.
8. Lapping is alternated with applying paste until a continuous, clean, matte surface is obtained both on the plug and in the conical hole.
9. After finishing the grinding, remove the plug, wash all surfaces in kerosene and wipe dry.
The quality of lapping is determined by the density of contact between the conical surfaces of the plug and the hole. For this:
1. Draw a line with a pencil on the surface of the cork along the generatrix.
2. The plug with the line is inserted into the conical hole and, with light pressure, the plug is turned one or two full turns. If the line is erased evenly along the entire length, then the planes are ground in correctly.
If you or your neighbor are faced with such annoying problems as: a jammed faucet, a burner that doesn’t light, or an electric ignition that constantly works while gas equipment repair services are beyond your means, then this section will help you carry out a superficial repair. DIY gas stove repair.
Basically, all components and assemblies of a gas stove are motionless, rigidly and securely attached to the body of the product. The only exception here is a gas valve with a rotating bronze plug inside, which leaks gas when the graphite lubricant dries. Gas and air combine to form an explosive mixture that can cause a lot of trouble. So we'll take a closer look at the structure of the stove's gas tap and how to deal with gas leaks.
The structure of the stove gas tap
1 - pen;2 - rod;
3 - hairpin;
4 - gas pipeline;
5 - conical plug;
6 - valve body;
7 - slab wall;
8 - screw;
9 - nipple;
10 - damper;
11 - burner body.
Gas valve (Fig. 1) Let's start with the valve body6 , which is rigidly screwed with a clamp to the gas pipeline of the stove. There is a hole at the bottom of the faucet4 , which leads gas to the stove burner. There is a small nipple in the faucet opening that connects the pipe and the faucet. To burn gas, air and gas are mixed (injected) in a Venturi tube in certain proportions. Also in the gas valve, it is equipped with an idle speed adjustment screw.
There is a bronze plug inside the tap 5 conical in shape, which, when turned, regulates the gas supply to the stove thermostat, and then to the burner. In order for our plug to be reliable and fixed in the valve body, a pressure spring is installed, which rests against the plug, preventing it from jumping out from the gas pressure. There is a groove in the housing cover that guides the plug during rotation.
Gas valve malfunctions and their elimination
G it burns sluggishly or flows poorly into the burner , even when we open the tap at full capacity. This usually means that the nozzle hole of the stove is clogged with combustion products or food. You can clean it with a sharp knitting needle or use sharpened non-metal objects (toothpick, match). A needle and other thin metal objects can break and leave a hole beyond repair. It is best to unscrew the nozzle and wash it in a soapy solution of cleaning products.
TO the wound turns tightly , and when returning to the off position. inaudible characteristic metallic click. The usual cause is a lack of graphite grease on the bronze valve plug. Oxidation and contamination of the rotary rod. In this case, reassembling the stove tap and completely flushing it will give a positive result.
Before removing the tap, make sure that there is no gas in the system by opening the stove burner.
To dismantle the gas stove tap, you need to remove all the plastic handles and the decorative panel behind them. Once we have removed the outer panel, we have full access to the gas valve studs that hold the valve to the pipeline. The pin must be unscrewed and carefully removed. Unscrew the valve body in your hands, remove the bronze plug and the spring itself. It happens that the cork sticks to the body, then you need to use improvised objects and try to pull it out. We insert the tool into the gap between the plug and the body, carefully turn the plug in a circle and pull it towards you. It is advisable to wash all faucet parts that are in your hands in a solvent and wipe dry.
It must be remembered that the body and plug of the faucet are made of bronze (with the exception of the stud) and when cleaning them from dirt, iron (steel) objects should not be used. A small damage or scratch may cause a gas leak. Use cotton swabs or a wooden stick. After cleaning, make sure that there are no pieces of cotton wool or thread fibers left inside, be sure to blow it out. A thin layer of graphite lubricant is applied to the plug, after which it is inserted into the tap and slightly turned; this is necessary so that the lubricant is distributed evenly over the cone.
WITH free movement of the handle 360° . Usually occurs during prolonged use of the stove. The reasons were that the mounting hole in the handle was broken, the screw of the faucet plug holder was unscrewed, and the pin jumped out of the rod. Measures to repair the damage. In the first case, you should find and install another handle. In the second, replace the rod or solder a flat on it (it is better to use hard solder). In the third, you will have to return the pin to its place.
R The arm turns with great difficulty or does not turn at all . The use of force in this case is not required, since there is a possibility of breaking the valve stem. Usually this defect indicates a foreign object caught in the slot between the body and the plug. To prevent such situations from happening, we advise you to call a gas stove repairman more often for preventative maintenance. condensate
