It is designed to reduce the pressure fluctuation in the pipeline system when the pump is stopped due to the opening and closing of Guoshui spring or power failure. It can reliably protect the water boiling and water vegetable station. This valve is a pilot side control, hydraulically driven piston type (plunger valve) control valve. The pressure difference between the two ends of the valve is the energy source to drive it to open and close. The driving device of the valve is divided into upper and lower control chambers. The upper chamber is controlled by the pilot valve and operated by adjusting the built-in needle valve of the pilot valve and the relief pilot valve. The cavity is connected with the pressure in the valve body through a fixed small hole, so that the closing of the valve is buffered.

In the pipeline water supply system, this kind of pressure fluctuation often shows obvious low pressure section, and then sudden pump stop will produce huge pressure fluctuation and high pressure surge

In addition to preventing pressure fluctuation, the valve also has the function of maintaining system pressure. When the system pressure exceeds the unsettled value of the high pool pressure pilot valve, the pilot valve will open, leading to the main valve opening, so that the system pressure relief. If the system pressure recovers below the pilot valve setting value, the pilot valve will close, causing the main valve to close slowly.

The water hammer pre discharge valve is composed of main valve, high pressure hydraulic pilot valve, pipe and other parts. It has the function of hydraulic automatic control, high-pressure unconditional lifting and discharging, quick opening and slow closing of the main valve, and has the function of preventing I "body closing valve water hammer.

The water hammer pre discharge valve is used on the outlet pipe of vegetables. It is close to the source of water percussion, such as check valve. It is connected with T-type two-way, which can be opened in advance to prevent water hammer and release high-pressure water hammer unconditionally. It is a post safety protection equipment of vegetable station, which can effectively improve the safety and reliability of the system

1. Equipment model: ga6700 (. Straight through type) ga6600 (angle type)
2. Nominal pressure: l.ompa 1.6 MPa 2.5MPa 4.0 MPa 6.4'mpa W. OmpA
3 set pressure: ① high pressure: 1.1 times of the actual working pressure; ② high pressure; 1.15 times of the actual working pressure; 2;
4. The reaction time of water hammer relief valve is no more than 0.5 s, that is, the reaction time from the water hammer to the action of water hammer relief valve is less than 0.5 s.
Applicable medium: raw water and clear water
Medium temperature: 1 ~ 80 ° C
Strength test: 1.5 times of working pressure,
8. Sealing test: l 1 times of working pressure

]The overpressure drain high pressure pilot valve has the function of over control and unconditional overpressure protection.
Differential piston design, under any working lifting force, it can only reliably close and push;
Stable operation without vibration - the main valve adopts V-shaped opening disc design, with excellent regulation performance and stable operation (without producing 4 "self) American valve water hammer);
I regulating valve operation, (automatic or adjustable valve opening degree), air cushion damping slow closing, prevent self closing valve water sharp
The seat design shifts the location of the maximum flow rate downstream of the seat seal to reduce the effect of cavitation on the seat. Therefore, it can reduce wear and prolong service life;
The rectangular flat seal is flat and can be replaced online, and the valve is closed tightly;
The valves are lined with stainless steel;
&Quick response (open valve pool water) - a high sensitive pressure relief pilot valve with large channels can quickly open the main valve (water discharge and hammer elimination) in response to overpressure conditions, and close the valve at a controllable speed when the pressure is stable;
9. Mouth "seasonal -A larger size of high-pressure conduit can be used to reduce the risk of blockage and kinking. Elastic valve seat, stainless steel pilot valve with standard Y-type filter, long service life and reliable operation;
10. Convenient maintenance - although the valve is installed on the pipeline, all the internal components can be removed. As long as the top cover is opened, the parts can be repaired and replaced. The standard isolation valve on the pipe allows fast special valve maintenance;
IL preset - each valve is tested and preset before delivery, but the valve can be easily adjusted on site according to the requirements,
12. Heavy duty super valve body structure, firm and durable;

Serial number	Name you	Lining Pang
1	Valve sleeve and ganggai	Ball hanging uranium iron, cast steel, no steel
2	valve seat	No steel
3	Piston, V-shaped cylinder	stainless steel
4	High pressure hydraulic pilot valve	stainless steel
5	High pressure hydraulic pilot valve	Dark rubber
6	Sealing of dark rubber seat	Rubber
7	Pilot ring	It's quiet
8	Seat backup ring	It's quiet
9	Screw gun gasket	Alloy steel
10	Zhanpian	He Wei I Wu
I 11	Auxiliary pipe ground lining	Zixun, genghu pressure pipe

① During the service life, it can normally sense the change of water hammer pressure caused by sudden power-off and pump stop, sense low-pressure to open water discharge, induction power-off to open water discharge, and induction high-pressure to open water discharge. Moreover, the high pressure pilot valve has the function of over control, which can relieve the pressure unconditionally. It has the function of early sensing the precursor of water hammer - low pressure, opening in advance, preventing the instantaneous rise of high-pressure water hammer; and can slowly close the main valve to prevent its own closing water hammer, without manual operation to control the valve closing.
② In case of sudden voltage drop or power failure, it will be opened immediately and kept open, waiting for the high voltage wave to return, and the opening time can be adjusted within a certain range.
③ When the water pump is cut off, the water discharge is started when the water pump is cut off or the accident power is cut off, and the water discharge is started when the abnormal low pressure occurs, and the water can be opened for an adjustable period of time. Please describe the importance of maintaining the opening for a certain period of time after the instantaneous opening, and the action trend and reasons of the main valve after the time delay reaches the point.
④ It has the anti misoperation delay function of initial low pressure, which can avoid the main valve from opening when the water pump is just started. The delay can be adjusted between a certain range.
⑤ Stable operation, no vibration: the main valve should adopt the differential diaphragm structure design, so that the main valve has approximate linear regulation characteristics in the full flow range, especially when the slight water hammer occurs and the required discharge is small enough to meet the protection requirements, the valve disc only needs to be opened a small point, so as to avoid the phenomenon of "frequency jump" of the diaphragm, so that the main valve can operate smoothly without (itself) closing At the same time, when the main valve is fully opened, the larger flow area should not be less than the valve port area required by the valve size normally, and the over-flow area of the valve port should not be reduced.
⑥ Large valve closing force: even in the case of low working pressure, the structural design of the main valve should ensure that it can provide reliable working power and ensure automatic closing when the pressure returns to normal. The main valve structure should adopt the differential diaphragm design to ensure reliable closing driving force under any working pressure.
⑦ Quick response (valve opening and water discharging): the opening time of response water hammer is required to be less than or equal to 1s, and the valve is slowly closed at a controllable speed after the pressure subsides.
⑧ Slow closing: the surge prevention valve must have reliable slow closing capacity / structure to prevent its own closing water hammer.
⑨ Capacity of pressure relief and hammer elimination: proper discharge capacity is required to protect the system from water hammer damage. The water hammer prevention valve should be a regulating valve, and the opening degree of the valve can be automatically adjusted with the size of the water hammer wave. In order to meet the pressure relief requirements, when the water hammer accident occurs, the larger discharge of the full open main valve should not be less than 350 m3 / H (assuming that the water hammer valve outlet flows freely).
⑩ Anti cavitation performance: since the water hammer prevention valve is usually directly discharged to the atmosphere, it is easy to have high-speed water flow and cavitation when it is opened. The valve shall be designed to protect the seat against cavitation and to avoid the impact of high velocity discharge flow.

DN	50	65	80	100	125	150	200	250	300	350	400	450	500
A	143	145	155	175	200	225	275	325	375	425	475	500	600
B	150	150	165	195	220	240	280	340	390	440	500	530	600
C	250	260	290	310	370	420	460	500	550	630	700	800	850
D	120	130	150	170	200	240	290	350	410	450	530	570	610

Note: the overall dimension is 1.6Mpa pressure angle type water hammer prevention valve. If you need higher pressure size drawing, please contact us.
The main feature of imported water hammer prevention valve is that it can be used as both protection valve and preventive valve. As a protective valve, it can release the pressure in the water supply pipe which exceeds the safety setting value of the guide valve, and maintain the pressure in the pipe below a safety setting value, so as to prevent the pipeline or equipment from being damaged by high pressure or sudden pressure in the pipe. It can be used for the protection of high-rise building fire-fighting test circulation system and water supply system, so as to prevent system danger caused by high water pressure. When used as the prevention valve, the water supply pressure upstream of the main valve can be maintained above a certain set value to ensure the pressure in the water supply area upstream of the main valve. In short, the water hammer prevention valve is an ideal product for water supply system.