how to design control bypass hydraulic automatic pressure relief valve

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A valve in the pump water conveyance pipeline system problems:



Pump water conveyance pipeline system, when suddenly stop the pump, the pump outlet check valve quickly shut down, resulting in a sudden d rop in the circulation flow rate in the valve outlet piping, and a return shock pressure, the sudden impact of pressure wave propagation, transmission speed high, so that the valve outlet pressure increased to several times the rated pressure pipeline water hammer phenomenon, it can cause the valve or pipeline rupture, resulting in an accident. In order to avoid such incidents, people are using with delayed closing of the characteristics of the valve, such as two-stage control to close the butterfly valve, hydraulic control valve with a picture-valve plate, the slow closing check valve, the valve to delay the closure, some of the water by pump and rotor parts back in order to achieve relief to eliminate the purpose of the water hammer pressure. However, due to the relief a long time, the return of water for a long time the impact of the pump impeller, the pump rotor part reverse speed, a long time will dama ge the pump rotor components and its associated rotor components.



Second, how to design control automatic bypass hydraulic pressure relief valve?



In order to solve the above problem, there is need to design an automatic pressure relief valve installed in the bypass pipe on the road, it can reflux lead to the pump inlet pressure relief time and relief reflux is no longer pump rotor parts, complete relief can automatically shut down completely solved the problem of the impact of relief reflux pump reversal, and effectively eliminate water hammer.



(A), structural design
The valve from the valve body, hydraulic chamber, hydraulic tube a hydraulic tube b. Body for a four-way pipe, hydraulic drive rod, under the valve plate on the valve plate, hydraulic drive rod ends with thread. The lower body to the inlet and outlet pipe connection by connecti on screws and bottom cover connected on both sides of the body up and down each one, out of the middle of the valve body near the outlet at the sealing seat on the valve plate by welding and hydraulic drive rod connected, under the valve board through the nut, the connection of the hydraulic drive rod threaded at one end of the hydraulic drive lever, the valve body through the upper flange and the hydraulic chamber connected. Hydraulic chamber by the hydraulic chamber seats, hydraulic chamber cover, hydraulic chamber and the piston into one through the screw, nut and body associated hydraulic chamber seat seat cover hydraulic chamber, the piston in the body of the hydraulic chamber, hydraulic transmission lever by hydraulic cavity seat cover with nuts, hydraulic drive rod threaded at one end connected with the piston. Piston hydraulic chamber is divided into the superior vena and inferior vena \"O\" ring on the piston, compress the seal on the piston \"O\" ring seals and hydraulic chamber inner wall, the upper and lower chamber of the hydraulic chamber completely isolated. Hydraulic chamber cover to open the flow holes, hydraulic pipe to a chamber connected through the flow hole hydraulic chamber. Hydraulic chamber seat to open the flow passage hole, hydraulic tube b connected with the hydraulic chamber of the inferior vena cavity connected through the flow hole and the hydraulic chamber.

On the valve plate, seat cover of the hydraulic chamber is installed on the \"O\" ring, only the hydraulic chamber cover and hydraulic cavity between the mouth with the surface of the installation gasket under the valve plate hydraulic chamber and the hydraulic chamber Block the only port between the mating surfaces of the installation gasket mating surfaces install the gasket mating surfaces of the installation gasket between the body and the bottom cover and th e Mouth of the Mouth of a hydraulic chamber between the seat and the valve body. Install the filters in a hydraulic pipe, valve micro-check valves, filters, control valves installed on the hydraulic tube b. Cover to open the flow hole in the hydraulic chamber through the flow holes to re-connect the hydraulic tube c, and is equipped with micro-check valve hydraulic chamber cover installation to put the gas plug. The hydraulic chamber cover installation deflated plug, can be used to let go of the gas chamber in the hydraulic chamber.



Hydraulic chamber by the seat of the hydraulic chamber, hydraulic chamber cover, the hydraulic chamber and diaphragm plate, diaphragm, diaphragm cover, diaphragm plate, diaphragm, diaphragm gland in vivo in the hydraulic chamber, the diaphragm plate above the diaphragm, the diaphragm cover, diaphragm following hy draulic drive rod hydraulic chamber seat cover with nuts, hydraulic thread one end of the drive rod and diaphragm cover, diaphragm, diaphragm plates linked together, hydraulic cover cavity between the diaphragm and the hydraulic chamber cavity through the screw, nut connection, diaphragm hydraulic chamber is divided into two cavities, and the upper and lower chamber is completely isolated.



(B), works and functions:

Bypass fluid control pressure relief valve with the above-mentioned structure, used for conveying fluid piping systems installed in the bypass pressure relief pipe on the exit side of the pump outlet check valve, the function and the results can be achieved as follows. When the pump in the starting state, and hydraulic pipe connected to the hydraulic chamber cavity pressure higher than the chamber pressure on the hydraulic chamber connected with the hydraulic tube, the pressure difference, the piston moving up and driven by the hy draulic drive rod under the valve plate moving up, this time, the inlet and outlet liquid from entering through the valve body inlet and outlet from the previous outflow. The valve plate when the piston moves up and driven through the hydraulic driving rod move up until the next valve plate and valve body sealing seat contact the board under the valve \"O\" ring is compressed to seal, then on the inlet and outlet and inlet and outlet liquid flow at this time, the pump and piping systems in normal working condition, the hydraulic chamber cover the connection of hydraulic pipe can speed up the flow speed of hydraulic cavity, so that this process quickly.

When a sudden power outage, check valves automatically shut down, the cavity pressure in the hydraulic chamber is larger than the cavity pressure in the hydraulic chamber, the piston moves down under the pressure difference and drive under the valve plate moves down, the \"O\" ring loss of sealin g the inlet and outlet liquid flow into and from the next inlet and outlet discharge by the body on the valve plate also simultaneously driven by hydraulic drive rod moves down until contact with the valve body sealing seat \"O\" ring is compressed to seal this time, to stop the liquid flow into the inlet and outlet hydraulic role of elimination. From under the valve plate and valve plate moves down, \"O\" ring loss of sealing the beginning to the \"O\" ring this time the seal is relief.



Gasket to ensure that the hydraulic chamber the liquid does not leak, the seals used to ensure that the valve body of the liquid is not compromised. \"O\" ring on the seat cover of the hydraulic chamber to isolate the hydraulic chamber and the valve body of liquid. In order to adjust the pressure relief time, equipped with a regulating valve in the hydraulic tube, relief time through the control valve to control the hydraulic cav ity and inferior vena liquid inflow and outflow speed to adjust. In the hydraulic tube equipped with a filter for filtering the liquid impurities, to ensure the hydraulic cavity cleaning. Equipped with a micro-check valve in the hydraulic tube, can be used to throttle the water flow into the cavity on the hydraulic chamber. Flexible action of the valve, adjustable closing time (the fastest 15s, slowest 348s) for complex pipe network system, to eliminate water hammer effect, completely solved the two-stage off check valve slow closing time, the backwater impact of pump anti- turn the problem.



(C) should be:
Design and manufacture caliber 80mm, 150mm, 300mm three kinds of pressure relief valve, nominal pressure 1.6MPa, used in water, metallurgy circulating cooling water, petrochemical cooling water circulation piping system, proved by the nearly one year of operation, the flexible movement of the valve, adjustable closing time for complex pipe netwo rk system, to eliminate water hammer effect, completely solved the two-stage off the check valve slow closing a long time, and the reversal of backwater impact. Valve structure and performance design method is feasible and accurate, parameter selection.



Bypass hydraulic control pressure relief valve installed in the main channel in the bypass check valve on the outlet side pipe, and check valves used in conjunction with, the use of pressure liquid to drive and automatic control of the pipeline, completely solved the traditional two-stage close valve to eliminate water hammer pressure discharge pump rotor part reverse the problem. Because of its close time is adjustable, applicable to a variety of complex pipeline to eliminate water hammer pressure, a new pressure relief valve for the promotion of value.