Types of plugs for pipes, instructions on how to do it yourself


Open pipe ends require seal­ing. There are var­i­ous options for plugs used as a shut­ter. They are indis­pens­able for car­ry­ing out repair work, trans­port­ing the pro­file, fin­ish­ing the struc­ture. You can install this type of stop valves your­self, using parts that are ready-made or made from impro­vised mate­ri­als.

Gen­er­al view of a closed pipe sec­tion

What are locking elements for?

Installing a plug on the end of the pipes is car­ried out in such cas­es:

  • When dis­trib­ut­ing water, gas, sew­er net­works, in order to pre­vent any for­eign objects from get­ting inside, includ­ing debris;
  • Dur­ing the repair work in a sep­a­rate sec­tor. Con­sti­pa­tion is set so that the whole sys­tem con­tin­ues to func­tion;
  • If it is nec­es­sary to pre­serve a sep­a­rate sec­tion of the net­work, which will not be used at this stage of con­struc­tion, but is nec­es­sary for fur­ther pipeline instal­la­tion;
  • Dur­ing demo­li­tion work. With the help of clos­ing parts, the net­work is divid­ed into sep­a­rate branch­es that work in par­al­lel. There­fore, dis­man­tling the pipes of one part does not lead to a shut­down of water or gas in the entire sys­tem;
  • When elim­i­nat­ing acci­dents, to urgent­ly stop the leak­age of pipe filler..

Note! With the help of plugs, any cut of the pipe is made out, which can­not be hid­den under wall dec­o­ra­tion, inside fur­ni­ture, build­ing struc­tures. In this case, they also play a dec­o­ra­tive role.

Shut-off valves for met­al pipes also act as pro­tec­tion against mois­ture, from the devel­op­ment of cor­ro­sive process­es.

Overview of types of locking elements for pipes

They are clas­si­fied accord­ing to the fol­low­ing cri­te­ria:

  • Fea­tures of the design of the plugs. Allo­cate thread­ed, pneu­mat­ic, ellip­ti­cal, end, flange;
  • Mate­r­i­al type. They are made from met­al (steel, brass, includ­ing chrome-plat­ed), poly­mer (poly­eth­yl­ene, plas­tic), rub­ber, as well as from impro­vised means — wood, fiber­glass, met­al plates, polyurethane foam.
Fit­ting clas­si­fi­ca­tion

Threaded fittings

In sys­tems with a thread­ed con­nec­tion, thread­ed ones are used. They are made main­ly of met­al, but there are also plas­tic options. They can have exter­nal and inter­nal cut­ting.

They are eas­i­ly installed inde­pen­dent­ly when the thread type match­es the pipe. It is nec­es­sary to pay atten­tion to the seal­ing of the con­nec­tion point. Usu­al­ly this is a wind­ing of linen rope or FUM tape.

Impor­tant! Thread­ed plugs are lim­it­ed by the diam­e­ter of the pipe. Their diam­e­ter does not exceed 2 inch­es.

You can make a thread­ed plug with your own hands from a piece of met­al or met­al-plas­tic pro­file, if you cut the required type of thread using a die, screw plug, lathe.

Thread­ed part


Pneumatic elements

Rub­ber pneu­mat­ic plugs are used to elim­i­nate acci­dents on pipelines. They increase in vol­ume when air is pumped in. Rub­ber under the action of an air jet is stretched until it com­plete­ly blocks the hole. It is an effec­tive way to elim­i­nate emer­gency leak­age of liq­uid and gas from pipelines.

Flanged locking parts

Flange plug — a met­al (steel) or rub­ber plate that has sev­er­al holes for attach­ing to a pipe flange. Bolts or spe­cial­ized riv­ets act as fas­ten­ers. Flanges and plugs to them are mount­ed on pipes whose diam­e­ter exceeds 2 inch­es.

The tight­ness of the con­nec­tion between the fit­tings is achieved by using dif­fer­ent types of gas­kets, which are select­ed depend­ing on the pres­sure and tem­per­a­ture in the line.

Advice! The flange plug in the cen­tral­ized cold water sup­ply sys­tem is sealed with a rub­ber gas­ket, and hot — from heat-resis­tant mate­ri­als, such as paronite.

This type of stop valves is not only easy to install, but also dis­man­tle.

Flange plug

Elliptical elements

Made of sheet steel, ellip­ti­cal plugs are weld­ed to the pipe. They become an inte­gral part. They are used in indus­tri­al pipelines.

end parts

An easy way to pro­tect against clog­ging, cor­ro­sion, and fin­ish­ing of pipe rout­ing is to install an end cap. It is select­ed accord­ing to the type of pipe mate­r­i­al. Tra­di­tion­al­ly, it has the form of a cap that is snapped to the pipe cut. Inter­nal ver­sions are also avail­able. These types of plugs in apart­ments, pri­vate hous­es are usu­al­ly made inde­pen­dent­ly.

What influences the choice

There are four fac­tors that deter­mine the choice of the type of con­sti­pa­tion:

  1. How pipes are used Ellip­ti­cal fit­tings are mount­ed in gas sup­ply pipes as the most reli­able. In pipes used to deliv­er a work­ing mix­ture of high tem­per­a­ture and pres­sure, met­al plugs are used. In cold water, you can use any lock­ing ele­ments.
  2. Assign­ment of lock­ing caps. Ellip­ti­cal, thread­ed plugs serve for strong and long-term clog­ging of pipes. Pneu­mat­ic are used in emer­gency sit­u­a­tions. Flanged, thread­ed are need­ed where open­ing and clos­ing of the high­way is sup­posed.
  3. Pipe mate­r­i­al. The rules for installing plugs require that met­al be installed on met­al pipes in accor­dance with the type of met­al, plas­tic on plas­tic. The excep­tion is air fit­tings, which are con­sid­ered tem­po­rary. If the cap plays a dec­o­ra­tive role, then it is select­ed in accor­dance with the over­all design con­cept.
  4. Pipe geom­e­try. The basic rule: round for round, square for pro­file. A thread­ed plug can­not be fixed to a square sec­tion of the rein­force­ment. Dec­o­ra­tive ones that do not car­ry an oper­a­tional load may not com­ply with this rule.

Impor­tant! In order for the lock­ing ele­ment to ful­ly ful­fill its func­tion, the diam­e­ter of the plug, its geo­met­ric dimen­sions must com­plete­ly match the same dimen­sions of the pipe.

Pneu­mat­ic plug in oper­a­tion

End caps from improvised materials


You can inde­pen­dent­ly install fac­to­ry locks or make them from avail­able mate­ri­als:

  • “Grand­fa­ther” option — cork made of wood. A fun­gus is machined from the bar, in which the leg has a small­er diam­e­ter than the cap. The diam­e­ter of the leg cor­re­sponds to the diam­e­ter of the pipe. With a ham­mer (for plas­tic pipes of a rub­ber mal­let) they are dri­ven in with the leg inward until it stops into the cap. It is dif­fi­cult to change wood plugs in the water sup­ply, as the wood swells inside.
  • For tem­po­rary seal­ing, you can use a plas­tic bot­tle or cork to it. Mount­ed with a blow­torch.
  • Pipes that need to be pre­served in a non-work­ing state for a while can be foamed with mount­ing foam. To pre­vent the foam from falling into the pipe, the hole is clogged with paper. Then the paper cork is cov­ered with foam, so that the edges of the cut are com­plete­ly filled. At the last stage of instal­la­tion, the excess is removed, and the foam is cov­ered with pro­tec­tive mas­tic.
  • From sheets of met­al, plugs are made for self-tap­ping screws or weld­ing, which look like fac­to­ry ones. To do this, ele­ments are cut accord­ing to the para­me­ters of the hole with a mar­gin for fas­ten­ing. Weld­ing pro­vides a reli­able and durable seal­ing option.
  • Con­crete plugs are poured onto the fence posts, which are filled with sand inside. They have sig­nif­i­cant weight and can crush the sup­port.
wood­en chop

How to remove or replace the plug

Replace­ment of plugs is car­ried out in a man­ner cor­re­spond­ing to its type. Work order:

  • Dis­con­nect the pipeline from the sup­ply of liq­uid-gas car­ri­er;
  • Select tools for remov­ing and installing this type of plug. Pre­pare replace­ment of the lock­ing valve itself;
  • If the fit­ting is thread­ed, it is unscrewed, the threads are cleaned and a new ele­ment is screwed on. The ellip­ti­cal cap is cut off with a grinder. To pull out the pneu­mat­ic plug, open the valve on it and release the air. The pro­tec­tion is unscrewed from the flange.

Plugs are fit­tings used at var­i­ous stages of con­struc­tion, when repair­ing high­ways, and sim­ply as a fin­ish. Both fac­to­ry options and do-it-your­self caps are used.


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