Question 2: Is the shell pressure test and debugging in the sub-item of safety valve installation quota the same as its safety supervision and inspection? include ............
Question 3: Should the pump adapter body, check valve, safety valve and gate valve be priced separately? Standard coronary valve recommendation
First of all, you have to understand it this way
Many manufacturers can't make a full set.
For example, those who make valves are not qualified for fire fighting.
or vice versa, Dallas to the auditorium
Generally, the whole set of quotas is at the dealer's side, and he can help you organize the distribution.
Question 4: Which size should the safety valve 10 inch times 8 inch be set? The valve group is set according to the pipe diameter. For reference, please refer to Chapter 8 of Installation Quota for Industrial Pipeline Engineering.
Question 5: Which list and quota should be set for 280 fire dampers? This is the quota of fire dampers in ventilation and air conditioning chapter, which is generally calculated according to half circumference.
Question 6: What kind of rated valve is used for quick water inlet of this valve box? They are classified according to their functions and uses.
(1) Block valve: Block valve, also called closed-circuit valve, is used to connect or cut off the medium in the pipeline. Block valves include gate valves, globe valves and rotary valves.
Plug valve, ball valve, butterfly valve and diaphragm. (2) Check valve: Check valve, also known as check valve or check valve, is used to prevent the medium in the pipeline from flowing backwards. The bottom valve of the water pump suction switch also belongs to
Check valve.
(3) Safety valve: The function of the safety valve is to prevent the medium pressure in the pipeline or device from exceeding the specified value, so as to achieve the purpose of safety protection.
.
(4) Control valve: Control valve includes control valve, throttle valve and pressure reducing valve, and its function is to adjust parameters such as pressure and flow rate of medium.
(5) Diverter valve: Diverter valve includes various distribution valves and traps. Used to distribute, separate or mix the media in the pipeline.
2. Classification by nominal pressure
(1) vacuum valve: refers to the valve whose working pressure is lower than the standard atmospheric pressure.
(2) Low pressure valve: refers to the valve with nominal pressure PN ≤ 1.6Mpa.
(3) Medium-pressure valves: refer to valves with nominal pressures PN of 2.5, 4.0 and 6.4Mpa.
(4) High-pressure valve: refers to the valve with nominal pressure PN of 10 ~ 80 MPa.
(5) Ultra-high pressure valve: refers to the valve with nominal pressure PN≥ 100Mpa.
3. Classification according to working temperature
(1) ultra-low temperature valve: used for valves with working temperature of t450℃.
4. Classification by driving mode
(1) Automatic valve refers to a valve that does not need external force to drive, but relies on the energy of the medium itself to make the valve act. Such as safety valves, pressure reducing valves,
Trap, check valve, automatic regulating valve, etc.
(2) Electric valve: Electric valve can be driven by various power sources.
Electric valve: A valve driven by electricity.
Pneumatic valve: A valve driven by compressed air.
Hydraulic valve: A valve driven by the pressure of a liquid, such as oil.
In addition, there are combinations of the above driving modes, such as pneumatic-electric valves.
(3) Manual valve: Manual valve is operated manually with the help of handwheel, handle, lever and sprocket. When the opening and closing torque of the valve is large,
This kind of gear or worm gear reducer can be installed between the handwheel and the valve stem. Universal joints and transmission shafts can also be used for remote operation if necessary.
5. Classification by nominal diameter
(1) Small valves: valves with nominal diameter DN≤40mm.
(2) Intermediate diameter valve: a valve with a nominal diameter DN of 50 ~ 300mm.
(3) Large-diameter valves: valves with a nominal diameter of 350 ~ 1200mm.
(4) Extra-large-diameter valves: valves with nominal diameter dn ≥1400 mm. ..
6. Classification by structural features
(1) gate valve: the opening and closing parts (disc) are driven by the valve stem to move up and down along the center line of the valve seat;
(2) Plug valve: the opening and closing part (gate valve) is driven by the valve stem and moves up and down along the center line perpendicular to the valve seat;
(3) Plug valve: the opening and closing part (cone plug or ball) rotates around its own center line;
(4) Swing valve: the opening and closing part (disc) rotates around the shaft outside the valve seat;
(5) Butterfly valve: the opening and closing part (disc) rotates around the fixed shaft in the valve seat;
(6) Slide valve: The opening and closing parts slide in the direction perpendicular to the channel.
7. Classification by connection method
(1) Threaded connection valve: The valve body has internal thread or external thread, which is connected with the pipeline through thread.
(2) Flange valve: The valve body is connected by flange and connected with the pipeline flange.
(3) Welding connecting valve: The valve body has a welding groove and is welded with the pipeline.
(4) Clamp connection valve: The valve body has a clamp and is connected with the pipe clamp.
(5) Socket-type connecting valve: connected to the pipeline through a ferrule.
(6) Clamping valve: a connection form that directly clamps the valve and two pipelines together with bolts.
8. Classification according to valve body materials
(1) metal valve: Its valve body and other parts are made of metal. Such as cast iron valves, carbon steel valves, alloy steel valves, copper alloy valves and aluminum alloy valves.
Lead alloy valve, titanium alloy valve, Monel alloy valve, etc.
(2) Non-metallic valve: Its valve body and other parts are made of non-metallic materials. Such as plastic valves, ceramic valves, enamel valves, FRP valves, etc.
(3) Valves with metal body lining: valve body ... >>
Question 7: How to set the quota of process piping tee and elbow? (Add 50 points according to the answer) 1. Install pipe fittings according to process piping quota (distinguish welding methods).
2, welding welding blind flange, casing installation *0.6, flange blind flange only advocate material.
3. Only used for opening, refer to drilling tee *0.5.
4, water supply and drainage sleeve, most don't need to calculate pipe fittings, depending on the auxiliary materials of pipeline installation quota. ........
5. Whether the valve quota of the safety valve sleeve has a coefficient depends on the local quota description.
6, set of card installation, if the pipe slot connection quota includes pipe fitting installation, it is not calculated separately.
7, there are not many reward points, worthy of the audience? ...........
Question 8: What is the quota of automatic dosing device? In the expansion tank, the static pressure of the system is used as the initial design pressure head, and in the expansion tank, the pressure to ensure that the hot water in the system does not vaporize is used as the mobile terminal pressure head.
During the initial operation, start the make-up pump to inject water into the system and the water chamber in the pneumatic tank, and squeeze the excess water into the capsule after the system is full.
Due to the incompressibility of water, with the continuous increase of water volume, the volume of water chamber is also expanding, which compresses the air chamber and the pressure in the tank is also rising. When the pressure reaches the design pressure, the pressure controller turns off the makeup pump.
When the water in the system is heated and expanded, so that the system pressure rises above the design pressure, the excess water will be discharged into the make-up water tank through the safety valve for recycling. When the volume of water in the system decreases due to leakage or temperature drop, the water in the capsule is continuously pressed into the pipe network to supplement the pressure drop loss of the system. When the system pressure reaches the lowest pressure allowed by the design, restart the make-up water pump, and replenish water to the pipe network and air pressure tank through the pressure controller, and so on.
Vacuum exhaust device:
Its inlet specification is the same as that of the exhaust valve. Vacuum circuit breaker is also called vacuum valve.
Vacuum breaker is a device that can automatically eliminate the vacuum in water supply pipeline and effectively prevent siphon backflow. Divided into atmospheric type, pressure type and hose type. It is also called vacuum breaker valve, which is used for containers or pipelines. When the negative pressure or vacuum increases gradually due to the operation or stop of the system, the valve can automatically open, destroying the vacuum effect, so that the pipeline and other equipment will not collapse and crack, and protecting the safety of the equipment.
Apply the corresponding valve subtitle. If there is a special subtitle set, if not, apply the valve subtitle of the corresponding specification. Just convert the valve in the material into a vacuum valve. If it is an incomplete reserve price, remember to list the corresponding valves as vacuum valves when listing the materials separately.
Question 9: Which rated safety valve, pressure relief valve and flange valve should be implemented for the pressure relief device on the pipeline of the fire pump house?
Question 10: What is the list and quota of the spring safety valve sleeve in the spray system? Generally, the corresponding type of flange valve or groove valve is directly sleeved.