The bypass valve is part of a complete set of elements of the heating system of the dwelling. Bypass jumper provides water in a continuous mode where full stop pumping station is impossible (e.g., in a cooling station). Let us consider what it is.
What is the bypass valve
Bypass - mechanism nodes connecting the heating system in the forward and backward direction and the bypass part.
The hydraulic part is to facilitate maintenance and cleaning work at the failure of heating designs, improves security and performance heat supply pipe (shut-off) valves.
Technical specifications
Specifications bypass nodes designated by letter symbols and regulated GOST (№26349-84; 28338-89). Mark deciphered as follows:
- «DN» - this is the typical size of the holes in a mating socket piece. The diameter of the connecting tube may be slightly different (smaller or greater). GOST regulated nominal volume nozzle letter designation - "DN" (conditional passages).
- «KVS» - bypass bandwidth, expressed as a ratio of the coefficient. Marking fluid flow corresponds, at a temperature of 20 ° C, passing through Gidropribor per hour and the volume equal to 1 meter cubed. Valve pressure loss can not be more than 1 bar. This value is used to calculate the water head loss.
- «PN» - denotes the nominal and maximum bypass pressure, at a temperature of the working medium in 20 ° C. Index indicates the ratio of the temperature and pressure for safe and continuous operation of the heating equipment. The visitors' identification 'to PN' (nominal pressure) - is "Ru" (nominal pressure).
- "The range of settings" - pressure difference, support the efforts of the setpoint (spring) installed in the bypass valve - manufacturer.
Principle of operation
The operating principle of the overflow valve in the gate structure is based on counteracting spring pressure and water. Compressed spring presses the valve on the one hand, and the work environment with excessive force - on the other. Pressure design components together constrain the bypass closed position. As soon as one of the potential exceeds the allowable pressure (1.5 -2 times), it opens fully.
The degree of opening of the gate depends on the fluid force pressing on the valve. The flap creates a set pressure by the spring. the compression level affects the system pressure drop.
For reference! Overflow valves have low accuracy of maintaining the pressure in the heating devices.
Field of application and intended use
At power failure, the need to bypass the circulation pump (its setting) provides a continuous operation and eliminates the emergency mode.
The pipeline constructions gate valve for incoming fluid discharge reserve on a separate line (spare). If there are problems associated with the water pressure in the tubes, the bypass valve closes access to the heating radiator, directing the water into the opposite direction, or on a separate channel.
Types of bypass valves
gate valves are divided into two main categories:
- Bypass not comprising valve (direct action). The coolant with the view shutter is circulated through the pipes.
- The bypass valve comprising a reverse direction. This type of bridge is used for individual and common pumping stations for water supply to residential premises. It works when you turn on (open mode) and disconnected (closed to the public).
Differences and scope of use
Both categories of bypass valves are divided into subspecies:
- The bypass valve to automatic operation. Mounted on the trim of the gravity and pump heating system. In normal operation, the electronic supercharger bypass circuit is closed, and when stopping - open.
Automatic bypass is also divided into types: the injection type and type of valve.
In the first case, the bypass hydraulic elevator operates on the principle of capturing the discharged coolant region by directing it into a common stream and creating the necessary pressure. The valve operates in standalone mode, even when the power outage.
In the second case, the bypass valve is mounted reverse direction, which prevents retrograde move liquid in the pipeline. At position direction water passes without obstruction by the heating pipes and nozzles.
- Bypass without additional equipment. This heating system is a conventional pipe not equipped with additional devices. It uses when installing the radiators. The fluid in such a tube extends freely without hindrance in uncontrolled manner.
- Manual gate valve mechanism. Bypass - is a crane with a ball mechanism. The device does not create obstacles to the total flow of energy carrier in the open position, and does not reduce the lumen conduit openings. When fully closed the tap, the water does not fall into the pipes. The method makes it possible to adjust the heating of the room.
the bypass valve is required for the following activities in the individual room heating systems:
- Strapping pumping station;
- for supplying a small volume of liquid to the boiler;
- Fitting radiators in single-pipe line;
- uniform heating underfloor heating.
Each bypass connection has its own characteristics, depending on the operating space.
Stages bypass valve assembly (for the radiator and a circular pump)
Installing a bypass heating system equipped with a circulation pump, is made as follows:
- excess fluid is drained from the common pipe;
- a coolant pipe section is dismantled, the size of 40 cm;
- on pipe ends are cut hole diameter necessary for interfacing the bypass;
- on cut sections installed filter;
- more bypass valve is mounted;
- It cuts the hydraulic pump.
Important! Set screws incoming water distribution is carried out in the direction of general flow of the pipeline.
following setting circuit operates to radiators:
- checks diameters bypass and main conduit;
- mounted on a mating ends: one pipe bridge circuit and an adjusting valve;
- further valve is mounted as close as possible from the heating radiator.
Important! Before the tie bypass pipe should be checked for air pockets.
required tools
Assemble the bypass line with their own hands, you can use tools for installation works, the list of which is composed of the following items:
- Roulette for measuring the length and volume of the pipe;
- level to adjust the heating devices and the water supply deviation;
- pliers to remove and maintain separate pieces of the heating system;
- Adjustable wrenches for interfacing structure;
- key set for mounting (normal);
- cutter for metal;
- Screwdriver: Philips and flat;
- cutter (for large diameter pipes);
- welding machine;
- sander for smoothing corners pipes and tubes;
- punch;
- a gas burner.
For a one-time work necessarily acquire all the tools, but can be rented.
Recommendations and typical errors
Box-pass valve should be done according to the rules of construction standards and recommendations below:
- Before installing, it is desirable to place a filter (mesh type).
- Installation of monomers will help control water pressure.
- Should not twist, compress and stretch the pipes during installation.
- The median size of the joining of the pipes must not go beyond 5 DN 10 DN before and after the bypass.
The bypass valve can be mounted in horizontally and vertically directed pipe sections according to the installation instructions.
Advantages of application of the valve in the heating system
Cutting-pass valve has the following advantages:
- It reduces the level of rust;
- regulates the heating temperature;
- prevents noise unnatural origin;
- It reduces the load on the hydraulic pump.
The following error when installing a bypass valve can result in a complete replacement of pipes in the room:
- installation of the pump glandless;
- incorrect placement of the valve;
For reference! If you do not remove the stains near the manual tap, the pipe may bend.
Energy savings
Installing a simple engineering solution as a bypass valve, save the cost of paying for energy as a radiator, heat transfer is increased by 10%. The volume of coolant with the bypass valve incorporated in the packaging to increase to 30%.
