Pressure Reducing Valve/Pressure Control Valve/Pressure Relief and Pressure Sustaining Valve

• Media: Oil
• Certification: CCC, ISO, CE
• Temperature: Ordinary Temperature
• Connection: Flange
• Valve Seat: Single-Seat
• Structure: Diaphragm
• Material: Cast Iron
• Size: DN15-DN25
• Transport Package: Wooden Case
• Specification: DN15-DN25
• Trademark: HUIZHENG
• Origin: China
• HS Code: 8481804090
• Production Capacity: 3000

Product Description

Product Description
Pressure reducing valve
This valve is designed and manufactured by our company according to the advanced product of the same type in the United States, France and China. 
The valve body adopts the streamlined design with less internal head loss and large flow. The transmission mode adopts the hydraulic operation, and the
pipeline pressure is used to automatically control the up and down movement of valve disc, control the valve opening, and adjust the downstream pressure
, so as to maintain the downstream pressure above the pilot valve spring set value. When the downstream pressure exceeds the set value, the valve will shut 
down automatically, and guarantee the constant outlet pressure.The product is the ideal product used for domestic water, fire system and water supply system.

2. Structural 
    The valve consists of the main valve, pilot valve, needle valve, ball valve, micro filter and pressure gauge etc. The pilot valve, needle valve, ball valve and 
pressure gauge are connected to the main valve with pipe, so it is collectively called as the pipe control system, as shown in the below picture.

 Main dimension

Main Dimension	DN	40	50	65	80	100	125	150	200	250	300	350	400	450	500	600
	L	205	205	250	250	320	415	415	500	605	690	787	787	864	914	1067
	H1	112	115	128	147	174	214	224	287	336	402	480	510	598	669	754
Control Flow	Min	0.5	0.55	1	1.2	2.9	8.5	9.2	15	28	45	78	117	210	336	490
	Max	21	37	46	50	95	170	230	360	800	1090	1402	1870	2316	2829	4030

5. Working principle and purpose
    The pressure P1 enters the control room of main valve through pipe and needle valve 23 (see the chart), and establishes the downward pressure P3. The
 outlet pressure P2 can act on the diaphragm of pilot valve 22 through the pipe and conflict with the adjustment spring of pilot valve. When the downstream 
pressure exceeds the pilot valve spring set value, the pilot valve will be closed, the water discharge in the control chamber is 0, and the variable pressure F3 
reaches the maximum value, and the main valve pressure seat valve is closed tightly. When the downstream pressure is less than the pilot valve spring set 
value, the pilot valve will open, and the water discharge in the control chamber will pass downstream through the pilot valve 22 and ball valve 19. The needle
 valve opening is small (1/4-1/2), and the inlet duct is smaller than the outlet duct in the diameter, so the discharge speed is greater than the inlet pressure filling
 speed, thus the pressure F3 in the control room is reduced, and the inlet pressure P1 acts on main valve disc 23 and raises it, so as to open the decompression valve.
 In the steady regulation state, the discharge flow is equal to the filling flow, the main valve opening is unchanged, and the downstream pressure is stable.

6. Installation and adjustment
1. The optimal installation of main valve is horizontal installation with pump cover up. Other installation methods can also realize the use function, and it is 
necessary to thoroughly remove the sundries in the pipe before installation. Pay attention to the flow direction arrow on the main valve body, and follow the 
correct direction. Ensure that no pipe stress is on the valve body and internal parts after installation.
2. Before the installation of main valve, a gate valve and a filter should be installed, and a gate valve should also be installed behind the main valve for repair. 
3. Regularly clean the micro filter 24 on the main valve.
4. Thoroughly flush the pipe before filling water.
5. Install the bypass-valve for important water pipe
6. Pressure regulation method
1) Close the upstream isolation valve, open the downstream isolation valve for decompression, and lower the downstream pressure below 0.1MPa, and close
 the downstream isolation valve;
2) Rotate the pilot valve adjusting screw to the top position;
3) Open the upstream isolation valve slowly;
4) Tighten the pilot valve adjusting screw down, and the outlet pressure will gradually rise, and lock the adjusting screw until reaching the set value;  
5) Under the excessive pressure regulation, adjust from the first step; that is, adjust from low to high pressure.

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