In what applications are gate valves, globe valves, and butterfly valves suitable?

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1. Butterfly valves designed for the inlet and outlet of chilled water units and cooling water; 2. Butterfly valve in front of the water pump, filter, check valve and butterfly valve behind the water pump; 3. Pressure differential bypass valve between the water collectors and distributors; 4. Butterfly valves for the inlet and return pipes of the water collectors and distributors; 5. Butterfly valves for horizontal main pipes; 6. Gate valves, filters, and electric two-way or three-way valves for air handling units; 7. Gate valves for fan coils (or with electric two-way valves). Generally, when butterfly valves are used, handle-type butterfly valves (D71X, D41X) are employed for diameters less than 150 mm, while worm-drive butterfly valves (D371X, D341X) are used for diameters greater than 150 mm. 　　Precautions for selecting valves: 1. Bypasses must be installed for pressure relief valves, balance valves, etc.; 2. Ball valves and gate valves are the best choices for applications that require full opening and closing; 3. Use globe valves as little as possible; 4. Attention should be paid to the calculation of the resistance associated with valves; 5. Electric valves must be selected carefully. 　　Valves used in water supply pipelines should be selected according to the applicable requirements based on the principles listed below: 1. When it is necessary to regulate flow rate or water pressure, control valves or globe valves are suitable; 2. In areas where low water flow resistance is required (such as on the suction pipes of water pumps), gate valves are appropriate; 3. In spaces with limited installation space, butterfly valves or ball valves are preferable; 4. Globe valves must not be used in pipe sections where water flow needs to occur in both directions; 5. For water pumps with larger diameters, multi-functional valves are suitable for use on their outlet pipes.

Requirements for installing check valves: 1. On the inlet pipes; 2. On the inlet pipes of sealed water heaters or water-using equipment; 3. On the outlet pipes of water pumps; 4. On the outlet pipe sections of tanks, water towers, and elevated water reservoirs where the inlet and outlet pipes share the same pipeline. 　　Note: Pipe sections equipped with pipe check valves do not require a check valve to be installed. 　　The selection of the type of check valve should be determined based on factors such as the installation location of the check valve, the water pressure before the valve, the requirements for sealing performance when the valve is closed, and the magnitude of water hammer generated during closure. It should meet the following requirements: 1. In locations where the water pressure before the valve is low, swing check valves, ball check valves, and plug check valves are suitable choices. 　　2 For areas where tight sealing performance is required after closure, check valves equipped with closing springs are advisable. 　　3 To reduce the impact of water hammer during shutdown, it is advisable to use quick-closing noise-suppressing check valves or slowly-closing check valves equipped with damping devices. 　　4 The valve disc or plug of the check valve should be able to close automatically under the action of gravity or spring force. 　　An exhaust device 1 should be installed at the right side of the water supply pipes. In water supply networks that are used intermittently, automatic exhaust valves should be installed at the ends of the network as well as at its highest points. 　　2. In sections of the water supply network where air accumulates due to significant fluctuations, automatic exhaust valves or manual valves have been installed at the peaks of these sections for air release. 3. In pressure-fed water supply systems, when an automatic air replenishment type pressure tank is used, an automatic exhaust valve should be installed at the highest point of the distribution network. 　　Project Number, Selection Principles, Valve Selection and Design. Shanghai Hongdie Valve Co., Ltd. specializes in the production of various valves, including globe valves, electric globe valves, pneumatic globe valves, electric butterfly valves, pneumatic butterfly valves, electric ball valves, pneumatic ball valves, electric gate valves, pneumatic gate valves, electric control valves, pneumatic control valves, and pressure reducing valves. Hydraulic control valves, vacuum valves, rubber-lined valves, fluorine-lined valves. 1. Butterfly valves for the design of the chilled water unit’s cooling water inlets and outlets; 2. Butterfly valve in front of the water pump, filter, check valve and butterfly valve behind the water pump; 3. Pressure differential bypass valve between the water collectors and distributors; 4. Butterfly valves for the inlet and return pipes of the water collectors and distributors; 5. Butterfly valves for horizontal main pipes; 6. Gate valves, filters, and electric two-way or three-way valves for air handling units; 7. Gate valves for fan coils (or with electric two-way valves). Generally, when butterfly valves are used, handle-type butterfly valves (D71X, D41X) are employed for diameters less than 150 mm, while worm-drive butterfly valves (D371X, D341X) are used for diameters greater than 150 mm. Precautions for selecting valves: 1. Bypasses must be installed for pressure regulators, balance valves, etc.; 2. Ball valves and gate valves are the best choices for full-open and full-closed operations; 3. Use globe valves as little as possible; 4. Attention should be paid to the calculation of valve resistance; 5. Electric valves must be selected carefully. Valves used in water supply pipelines should be selected according to the applicable requirements based on the principles listed in the right column. 1 When it is necessary to regulate flow rate or water pressure, control valves or globe valves are suitable; 2 In areas where low water flow resistance is required (such as on the suction pipe of a water pump), gate valves are appropriate; 3 In spaces with limited installation space, butterfly valves or ball valves are preferred; 4 Globe valves must not be used in sections where water flow needs to occur in both directions. 5 For water pumps with larger diameters, multi-functional valves should be used on their outlet pipes. Requirements for installing check valves: 1 On the inlet pipe; 2 On the inlet pipes of sealed water heaters or water-using equipment; 3 On the outlet pipe of a water pump; 4 On the outlet sections of tanks, water towers, and elevated water reservoirs where the inlet and outlet pipes share the same pipeline. Note: Pipe sections equipped with pipe check valves do not require a check valve to be installed. The selection of the type of check valve should be determined based on factors such as the installation location of the check valve, the water pressure before the valve, the requirements regarding sealing performance when the valve is closed, and the magnitude of water hammer generated during closure. It should meet the following requirements: 1. In locations where the water pressure before the valve is low, swing check valves, ball check valves, and plug check valves are suitable choices. 2 For areas where tight sealing performance is required after closure, check valves equipped with closing springs are advisable. 　　3 To reduce the impact of water hammer during shutdown, it is advisable to use quick-closing noise-suppressing check valves or slowly-closing check valves equipped with damping devices. 4 The valve disc or plug of the check valve should be able to close automatically under the action of gravity or spring force. An exhaust device 1 should be installed at the right side of the water supply pipes. In water supply networks that are used intermittently, automatic exhaust valves should be installed at the ends of the network as well as at its highest points. 2. In sections of the water supply network where air accumulates due to significant fluctuations, automatic exhaust valves or manual valves should be installed at the peak points of those sections for air release. 3. In pressure-fed water supply systems, when an automatic air replenishment type pressure tank is used, an automatic exhaust valve should be installed at the highest point of the distribution network. 　　1. Butterfly valves designed for the inlet and outlet of chilled water units and cooling water;
2. Butterfly valve in front of the water pump, filter, check valve and butterfly valve behind the water pump;
3. Pressure differential bypass valve between the water collectors and distributors;
4. Butterfly valves for the inlet and return pipes of the water collectors and distributors;
5. Butterfly valves for horizontal main pipes;
6. Gate valves, filters, and electric two-way or three-way valves for air handling units;
7. Gate valves (or with electric two-way valves) for fan coils.
Note: Generally, when butterfly valves are used, handle-type butterfly valves (D71X, D41X) are employed for diameters less than 150 mm, while worm-drive butterfly valves (D371X, D341X) are used for diameters greater than 150 mm. 　　Considerations for selecting HVAC valves: 1. Bypass valves must be installed on pressure regulators, balance valves, etc.; 2. Ball valves and gate valves are the best choices for applications that require full opening and closing; 3. Check valves should be used as little as possible in HVAC systems; 4. Attention should be paid to the calculation of valve resistance; 5. Electric valves must be of high quality. 　　Selection principles for valves used in water supply pipelines: 1. When it is necessary to regulate flow rate and water pressure, control valves or globe valves are suitable; 2. In areas where low water flow resistance is required (such as on the suction pipe of a water pump), gate valves are appropriate; 3. In spaces with limited installation space, butterfly valves or ball valves are preferable; 4. Globe valves should not be used in sections where water flow needs to occur in both directions; 5. For water pumps with larger diameters, multi-functional valves are suitable for use on their outlet pipes. 　　Requirements for installing check valves: 1. On the inlet pipe; 2. On the inlet pipe of sealed water heaters or water-using equipment; 3. On the outlet pipe of water pumps; 4. On the outlet section of tanks, water towers, and elevated water reservoirs that share a single pipe for both inlet and outlet water. 　　Note: Pipe sections equipped with pipe check valves do not require additional check valves. 　　Selection of valve type for check valves: It should be determined based on factors such as the installation location of the check valve, the water pressure before the valve, the requirements regarding sealing performance when the valve is closed, and the magnitude of water hammer generated during closure. The following requirements must be met: 1. In locations where the water pressure before the valve is low, swing check valves, ball check valves, and plug check valves are suitable choices. 　　2. For areas where tight sealing performance is required after closure, check valves equipped with closing springs are advisable. 　　3. To reduce the impact of water hammer during shutdown, it is advisable to use a quick-closing noise-reducing check valve or a slowly closing check valve equipped with a damping device. 　　4. The valve disc or plug of the check valve should be able to close automatically under the action of gravity or spring force. 　　Exhaust devices should be installed at the following locations of the water supply pipes: 1. In water supply networks that are used intermittently on a cyclic basis, automatic exhaust valves should be installed at the end of the network and at its highest point. 　　2. In sections of the water supply network where air accumulates due to significant fluctuations, automatic exhaust valves or manual valves have been installed at the peaks of these sections for exhaust. 　　3. Pressure water supply systems: When an automatic air-filled pressure tank is used, an automatic exhaust valve should be installed at the highest point of the piping network. In what situations are gate valves, globe valves, and butterfly valves suitable for use? These three types of valves can be arranged according to the ease of operation as follows: globe valve, gate valve, butterfly valve; according to the level of resistance they create: globe valve, butterfly valve, gate valve; according to the degree of tightness with which they can be closed: globe valve, butterfly valve, gate valve; and according to their cost: globe valve, butterfly valve, gate valve (with the exception of special-type butterfly valves). All three of these valves belong to the category of actuated valves. Based on the characteristics mentioned above, it is clear that globe valves are primarily used for opening and closing small-diameter pipes (branches) or at the ends of pipelines, as well as for regulating flow rates; butterfly valves are used for opening and closing main and branch pipes, as well as for regulating flow rates; gate valves are used for opening and closing main pipes, but generally not for regulating flow rates. What are the different types of balance valves? In what applications are they suitable? There are several types of balance valves; the first to be developed was the static balance valve. It allows for precise manual adjustment, and it can be connected to instruments for measuring resistance and converting it into flow rate. It is a valve whose local resistance coefficient can be adjusted with precision. It is usually installed on the main pipe; those with higher requirements can also be installed at branch pipes or at the equipment inlet. The disadvantage is that it can only balance the system resistance at the rated flow rate; when an electric valve is installed at the end to change the resistance, the hydraulic balance is affected. Dynamic balance valves, which were introduced in the 1990s, are used to maintain a constant flow rate even when the system pressure changes; in other words, the flow rate does not change as the system pressure varies, which is why they are called dynamic balance valves. Its application scenarios are clear: it can only be used in systems with a constant water flow rate, and it cannot be used in conjunction with electric valves. These two types of domestic valves were originally developed by the China Air Conditioning Research Institute. The FLOWCON dynamic balance electric control valve produced in Denmark is a next-generation product that combines an electric valve with dynamic balance