The plumbing, heating, ventilation systems often encountered need to regulate the water flow direction or air. For this purpose a check valve is used. He passes in one direction and blocks the flow of the pipeline, if he tries to change its direction of motion. On the market there are a large number of models of different designs of such closures. But in the home studio check valve to make their own hands is quite real.
work and the principle of appointment
Assignment device -not prevent reversal of water flow or air in the opposite direction. Such flow can damage the unit or significantly reduce the quality of his work. They are used in home systems:
- Water supply. Valves are placed in the bottom of the intake and do not allow water to drain into a well or borehole upon termination of the booster pump or the intake.
- Heating. The closure is placed on the lower contour point to prevent the reverse current when the coolant temperature drops.
- Ventilation. Check valve put on the drawing in apartment buildings, to prevent occurrence of reverse thrust during opening windows or doors. The low-rise buildings, it prevents outside air from entering the house through the hood.
In any gate has the following parts, regardless of its design:
- The housing, which is a sealed chamber to be connected to the pipeline break.
- Shut-off element-poppet, ball-shaped or petal.
- Saddle - compacted circuit to which it is pressed against the closure element and closes the flow lumen.
- Return element presses the locking seat. This can be a spring or gravity.
The operating principle of the gate is simple:
- Pressure water or air in a predetermined direction overcomes the force of spring or force of gravity and presses (or raises) the locking member from the valve seat.
- The stream flows in a desired direction.
- When the pressure drop or attempt to turn the flow in the opposite direction of the spring force or the force of gravity presses the closing element against the valve seat and blocks the lumen.
The higher pressure in the opposite direction, the more it presses the closure element against the valve seat and the flow reliably blocked.
The possibility of manufacturing their own hands
A deep sense of financial self-manufacturing of valves has- not buying components cost almost more expensive than ready-valve industrial production. Or in the home workshop should be highly accurate drilling, turning and milling machines for the independent production of parts of the device.
Most often, domestic master valves make their own hands to test their strength in the design and assembly. Make non-standard valves for domestic process plants for producing beverages or aquarium filtration systems and aeration. Further design and manufacturing techniques of the gate will be considered:
- Ball water.
- Gravity ball for water.
- Poppet.
- Flap for ventilation.
Simple design chosen, the technology does not require expensive equipment. Make a simple non-return valve in the home studio is quite real. Enough to own locksmith skills at the secondary level.
Instruments
For the manufacture of devices will need the following tools and equipment available for sure in every self-respecting home workshop:
- Desktop or workbench.
- Vise or clamp massive.
- Hacksaw.
- Drill or drill press table.
- Pliers.
- Mounting the knife.
- A set of files and Needle.
- Sandpaper with different grits.
- Jig (electric).
Materials and components for various designs require different and will be listed in the relevant section.
Recommendations regarding the production and.
Water Ball
In order to make the valve will need:
- Pipe coupling with an external thread.
- Tee steel or brass with internal thread.
- Spring, freely entering into the tee.
- The metal ball with a small clearance part of the tee.
- The plug on the tee.
- Summer FUM or sanitary thread.
If you are unable to pick up her wound pruzhinu- from elastic wire. Take the rod, drill a hole in it and is charged to the end of the wire. Further, the steel wire is clamped in the vise rod, and the pliers wound spring coils close stacking.
The assembly is performed in the following sequence:
- The coupling is screwed into the tee so that it covers the side lumen tube is not less than 2 mm.
- The hole is inserted opposite the ball and its spring props.
- Screwed plug.
- Sleeve and cap prior to final assembly is necessary to wrap the seal.
The water pressure coming from the coupling ball pushes and opens the lumen to flow in the forward direction. If the pressure drops, the spring pushes back the ball and presses it against the shear coupling, blocking flow in the reverse direction.
You need to adjust the force of the clamping force of the spring so that the standard pressure in the system enough for the ball to spin. It will also have to carefully polish the cut coupling to the adjacent ball without gaps.
Flap for ventilation systems
Industrial check valve for ventilation prevents reverse thrust in exhaust systems
The proposed design is comparable to the effectiveness of industrial designs and able to work for several years, and then have to replace the petals.
required for the manufacture of:
- Plate 3-5 mm thick PCB 15 * 15 cm. You can use any hard plastic.
- The film is a dense plastic 15 * 15 cm.
- Sealant.
Step by step instructions for the manufacture and assembly of:
- Saw off the plate so as to match the size of the hood.
- The corners sdealt attachment hole of the valve or fitting to the fan.
- In the middle of drill holes to saw or jigsaw air passage. It should be drunk at least 80% of the channel cross-sectional area.
- Cut a piece of flexible plastic and glue it to the base edges.
- Cut it along the centerline. Incisions are made smooth, without rough edges.
- Insert the bolt into the channel and fix it with the screws or screws. The flaps are facing the street.
plate
The poppet valve axis may be fabricated from readily available materials.
You will need:
- Nipple 1/2 "15mm.
- Bolt diameter of 3 mm and a length of 40-50mm.
- Two nut to a bolt.
- A piece of rubber from bicycle inner tube.
- Metal strip.
- coupling 1/2
Production improvised valve is performed in the following sequence:
- Rubber cut a round slice with a diameter slightly smaller than the inner diameter of the sleeve.
- In the center to make a hole of 3 mm diameter bolt.
- The metal strip drilled hole so that the bolt moved freely therein.
Figure 7. The locking element assembly - Wear on the bolt strip, nut, washer, rubber gasket.
- Make cuts in the end fitting so that the metal strip is fixed in them.
Figure 8. Setting records in cuts - Insert the assembled movable part of the valve in a threaded connection so that the gasket slightly acted bottom. Place the adjusting nut.
- Bottom tighten the second nut.
- Screwed on top of the second connector. He must press tightly against the metal strip.
Such a valve is used in domestic vacuum chambers. He works on the differential pressure.
gravity-Line
This simple design is intended for use in water supply wells. Immediately after it is put submersible pump or at the lower end of the suction pipe. Powered homemade gravitational non-return valve using gravity. Install it only to vertical piping segments.
device is needed for the manufacture of:
- Snip polypropylene tube.
- Metal or glass bead. The ball should be of a material heavier than water.
- Fitting.
- O-ring.
Inlet valve port connected to the output of the pump conduit or diversion filter. The ball is selected based on the inner diameter of the pipe.
The valve seat is an annular gasket in place of the pipe section changes. The gasket should fit snugly to the walls, and sharik- the gasket. This structure must withstand the pressure of the liquid column above the valve.
Depending on the depth of water in the horizon mirror may be from 6 to 15 meters. The outlet is attached to the housing with the other hand. And hereinafter referred to water intake pipes. That the ball did not go too far away from the seat and closes the outlet hole must be drilled before him two transverse holes and insert the piece of wire.
The wire will need to be securely sealed with adhesive, sealant, or riveting. It will serve as a limitation of the vertical motion of the ball.
When the pump starts, the water pressure will raise the ball above the seat, and it opens the passage for fluid flow. Stop the ball does not rise too high and block the outlet.
When the pump stops, gravitational force and the return fluid column pressure ball is pressed to the saddle, and the overlapping line.
possible difficulties
In the process of self-production of domestic masters face a number of difficulties:
- Wrong calculation of downforce. Spring has to be shortened or that the more unpleasant wound round again. We solve this problem is usually the selection.
- Insufficient surface quality saddle. The valve is not pressed thereto and fully water tight. Solved by surface polishing.
- Too high flow resistance conditions in a particular system. Can not be solved, it is necessary to select a different type of valve or buy industrial.
Own production of non-return valve will be a good test of their engineering and plumbing skills.