Product overview

        SP592 pressure regulating valve is a micro-pressure regulating valve for a commander and is extensively applied for the micro-pressure control of different gases and tank micro-pressure nitrogen sealing system. It can regulate the middle-pressure gas to reduce and stabilize the pressure to minimal pressure. The minimal control pressure is 0.15Kpa. The maximum control pressure is 11Kpa. The minimal operation temperature is -48℃. The maximum operation temperature is 1200C.

Product features

▲Excellent micro-pressure control performance--- pressure regulating valves takes many measures to adapt to precise and stable micro-pressure control.
Amplify lever force: the commander operation mechanism can amplify the pull force of the lever. The micro-pressure control should generate micro push on the film. The pure expanded film area will lead to too huge valve volume. The lever can amplify the push to 7 times for control without the need of increasing the valve volume.
Nozzle pilot valve: the commander control performance determines the control capability of the whole pressure regulating valve system. For the micro-pressure control, any friction and resistance will severely affect the control effect. The commander valve core is designed as the nozzle retaining plate structure without any sliding friction structure, so it is very high in control sensitivity.
Back pressure control: for the pneumatic system, the back pressure is very stable. The valve regulating valve is supplied with some gas by using main valve and dual-film cavity. The back film cavity can adjust the released gas flow via the commander nozzle for stable and precise control.
Embedded pressure reducing valve: the power gas of the pressure regulating valve of the command is from the gas ahead of the valve. Generally the before-valve pressure is higher and changes. The embedded pressure reducing valve inside the commander can reduce the higher stable pressure ahead of the valve and supply it to the control system of the pressure regulating valve.
Filter: it is the precise pneumatic instrument of the commander and requires clean control gas. The pilot pressure tube of the pressure regulating valve includes a filter to guarantee clean gas to the commander.
▲Low start pressure--- the main valve is driven by the lever, so the pressure regulating valve can normally start and adjust the pressure regulating valve by using 15Kpa before-valve pressure.
▲Withstand pressure difference---- the balance main valve core can make the pressure regulating valve withstand higher pressure.
▲Soft sealing seal---- the valve core is designed as software sealing structure and can easily cut off the flow.
▲No filling--- any friction resistance will affect the control precision of the pressure regulating valve in case of micro-pressure control. The non-filling structure of HPR592 realizes higher sensitivity of the whole regulation structure and reduces the external leakage point.
▲High precision--- The high-sensitivity main regulating valve for the commander provides a high control precision.
▲Low over control--- the less over control is expected for any control system. SP592 pressure regulating valve can regulate the flow, reduce the pressure much and easily generate over control. The nozzle of the commander is a valve stop core. When the pressure is over, the nozzle valve core will quickly open two film cavities of the balance main valve and quickly reduce the flow of the main valve to minimize over control.
▲High adjustment ratio---- this special regulation device and precise valve core make the pressure regulating valve have a higher adjustment ration. If needed, it can realize precise and stable control from “0” flow to full flow.
▲Secure over load--- to reduce the influence of the part gravity on the control pressure to most extent, the whole regulation device of the pressure regulating valve should be designed as small and precise as possible. The downstream pressure is very low during normal operation. The force on the regulation device is very small. The over load is unavoidable in actual operation. The downstream pressure can reach the before-valve pressure under abnormal state. At this time, the push generated by the film component is very destructive to the regulation device. The over load device of the SP592 pressure regulating valve can effectively remove the over load and avoid damage to the regulation device, namely when the pressure regulating valve is operating, in most cases, the film cavity of the executor can fully withstand the maximum operation pressure ahead of the valve without damage.
▲Easy pressure regulation--- the screw regulation device can realize easy, convenient and quick pressure regulation.
▲Stainless actuator - as an important part of the regulator, the actuator is made of stainless plate to ensure its high pressure-resistance and long service life.
▲Easy maintenance- the selection criteria of the every structure of the SP592 regulator is to make sure the most convenient installation and maintenance while ensuring the performance requirements are met.
The top-mounted push-down installation method allows you to inspect and maintain the internal parts without any special tools before disassembling the regulator.
The valve cover center positioning rule is used to avoid unnecessary repeated fitting. The internal parts should be reserved with enough gap, so the internal parts can be easily taken out or placed.
▲Universal parts – SP592 regulator has extremely high parts universality with the whole self-operated products series manufactured by our company. It helps to reduce the inventory of spare parts.

Operation principle

        The pressure regulating valve consists of the main valve, filter and commander. The main regulating valve receives the control signals of the commander to control the openness of the valve core and regulate the flow, so it can control the required process pressure. The filter can supply clean gas to the precise commander. The commander will sense the after-valve pressure, transform the introduced before-valve power pressure to the pneumatic signals and control openness of the main regulating valve.
        The main regulating valve is the constantly closed valve. The commander is the constantly open valve.
        The gas is supplied into the valve. The before-valve pressure gas is supplied into the commander via the filter. The embedded pressure-reducing valve of the commander will reduce the pressure. This pressure is supplied into two sides of the main valve film cavity via the constant throttling part. When the commander's nozzle is closed, the pressure on both sides of the main regulating valve film cavity is equal. The main regulating valve core is closed under push of the restore spring. To rotate the regulation screw of the commander, the commander spring is compressed to drive the film component and drive the lever to open the nozzle retaining plate. The pressure will be released in the left film cavity of the main regulating valve due to the constant throttling part. The pressure is different on both sides of the film cavity. The film component will drive the adjustment device of the main regulating valve to open the valve core. The gas will be supplied into the after-valve system. The after-valve pressure will feed back to the commander film via the pressure conduit to generate push and compare it with the given spring push. When the push is higher than the spring force, the nozzle retaining plate will reduce openness. On the contrary, it will increase the openness. Change of the nozzle retaining plate openness will directly change the pressure of the left film cavity of the main regulating valve and will also control the openness of the main regulating valve. For the whole pressure regulation system, the after-valve pressure reduces and the main regulating valve openness increase. The after-valve pressure increases and the main regulating valve openness reduces. When the push generated by the after-valve pressure on the commander film is equal to the given spring push, the nozzle retaining plate will keep under this openness. The pressure of the whole system and openness of the pressure regulating valve will be equal. At this time, the after-valve pressure is the set pressure. When the before-valve pressure change or after-valve flow change leads to after-valve pressure change, the old balance will be changed. The commander film will make the nozzle retaining plate adjust and change pneumatic signals of the main regulating valve, make the core of the main regulating valve adjust and make the pressure restore to the setting. The system will quickly restore to the balance state. When the after-valve flow reduces to “zero”, the after-valve pressure will gradually increase. The nozzle diameter is very small, the pressure will increase little and the nozzle will close under action of the lever pressurizing device. The pressure balance main regulating valve at two ends of the main valve film cavity will also close. The system is under holding state. 。
        The after-valve output pressure depends on the given spring push of the commander, to rotate the regulation screw, you can adjust and set the after-valve pressure. To clockwise rotate, the pressure will increase. To rotate anticlockwise, the pressure will decrease.
        The film component of the commander and connected nozzle retaining plate sensing device are very sensitive. If the after-valve pressure changes little, they will sense the signals and amplify them as the pneumatic signals to control the main regulating valve. The whole pressure regulation system has a very high regulation precision.
The nozzle is a valve core which controls the left and right film cavity channel of the main control valve. The pressure regulating valve can reduce the pressure much, when the system is affected by quick disturbance, it can easily lead to over control (mainly forward over pressure). To reduce the over control as much as possible, the nozzle closes two film cavities under action of the spring. When affected by quick disturbance, the after-valve pressure will increase little. The commander film will drive the retaining plate to push the nozzle and instantly open two film cavity channels of the main regulating valves to forcefully balance the pressure at two ends and quickly reduce the openness of the main valve core.
        The film component of the commander is installed with the over-load spring. The push of the over-load spring is computed and preset. The pre-compression force can guarantee normal operation of the pressure regulating valve. When the pressure is excessive, the regulation device is fixed in place. The film component can overcome pre-tightening force of the overload spring to continue movement till touching the film cover, so the over load will be imposed to the film cover and prevent the regulation device from damage. After the system restores to the normal state, it can normally operate.

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