CN100366967C - Pilot operated water pressure relief valve - Google Patents
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- CN100366967C CN100366967C CNB2004100130707A CN200410013070A CN100366967C CN 100366967 C CN100366967 C CN 100366967C CN B2004100130707 A CNB2004100130707 A CN B2004100130707A CN 200410013070 A CN200410013070 A CN 200410013070A CN 100366967 C CN100366967 C CN 100366967C
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 27
- 238000013016 damping Methods 0.000 claims abstract description 30
- 230000001105 regulatory effect Effects 0.000 claims abstract description 20
- 239000002131 composite material Substances 0.000 claims description 6
- 239000013505 freshwater Substances 0.000 abstract description 3
- 239000013535 sea water Substances 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000003628 erosive effect Effects 0.000 description 3
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- 230000013011 mating Effects 0.000 description 3
- 230000008016 vaporization Effects 0.000 description 3
- 238000009834 vaporization Methods 0.000 description 3
- 238000005491 wire drawing Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
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Abstract
先导式水压溢流阀，属于阀类，旨在于降低主阀口工作压差、加宽调压范围、减小导阀侧向振摆、增加导阀阻尼，实现抗气蚀低噪声。其主阀体具有前端盖，主阀体内设有主阀座、主阀套、主阀芯，主阀弹簧；先导阀由先导阀阀座、先导阀阀芯、调压弹簧构成，先导阀和主阀连接、先导阀阀芯上具有导向圆柱面，其与先导阀阀体内孔之间形成阻尼腔；主阀体入口处设置节流环、其径向有直径不同的节流孔，前端盖上装设压力挡调节旋钮、后者可旋转节流环以调节节流孔的工作位置；或者在前端盖上设置节流孔。本发明适用于以海水、淡水、高水基等作为工作介质的水液压系统中作为压力控制阀，具有工作压力高、调压范围宽、抗气蚀性能好、噪声低、工作稳定性好等优点。
Pilot-operated hydraulic pressure relief valve belongs to the valve category, aiming to reduce the working pressure difference of the main valve port, widen the pressure regulation range, reduce the pilot valve lateral vibration, increase the pilot valve damping, and realize anti-cavitation and low noise. The main valve body has a front cover, and the main valve body is equipped with a main valve seat, a main valve sleeve, a main valve core, and a main valve spring; the pilot valve is composed of a pilot valve seat, a pilot valve core, and a pressure regulating spring. The main valve is connected, and the pilot valve core has a guiding cylindrical surface, which forms a damping chamber with the inner hole of the pilot valve body; the main valve body inlet is provided with a throttling ring, and there are throttling holes with different diameters in the radial direction, and the front end cover A pressure stop adjustment knob is installed on the top, and the latter can rotate the throttle ring to adjust the working position of the throttle hole; or set a throttle hole on the front end cover. The invention is suitable for use as a pressure control valve in water hydraulic systems using seawater, fresh water, high water base, etc. as working media, and has the advantages of high working pressure, wide pressure regulating range, good anti-cavitation performance, low noise, and good working stability.
Description
技术领域technical field
本发明属于阀类，具体涉及一种先导式溢流阀，适用于水和水基介质液压系统中作为压力控制元件。The invention belongs to the category of valves, in particular to a pilot overflow valve, which is suitable for use as a pressure control element in hydraulic systems of water and water-based media.
背景技术Background technique
水压溢流阀是水(水基)介质液压传动系统中常用的压力控制元件，可作为调定系统工作压力的定压溢流阀或对系统起安全保护作用的安全阀。由于海水、淡水或高水基等介质具有汽化压力高的特性，当水压溢流阀在较高的压力下工作时，阀口处的流速很高，阀口流场的局部压力会低于水的汽化压力，水汽化后产生大量的气泡，这就是气穴现象。当气泡运动到压力恢复区后，气泡在外部压力作用下溃灭，这一过程不仅产生很大的噪声，而且产生较大的冲击和振动。此外先导阀阀芯的侧向振摆和工作不稳定也是引起溢流阀高频啸叫噪声的主要原因。The water pressure relief valve is a commonly used pressure control element in the water (water-based) medium hydraulic transmission system. It can be used as a constant pressure relief valve to set the working pressure of the system or a safety valve for the safety protection of the system. Due to the characteristics of high vaporization pressure of media such as seawater, fresh water or high water base, when the hydraulic pressure relief valve works at a higher pressure, the flow velocity at the valve port is very high, and the partial pressure of the flow field at the valve port will be lower than that of water. Vaporization pressure, water vaporization produces a large number of bubbles, which is the cavitation phenomenon. When the bubbles move to the pressure recovery zone, the bubbles collapse under the action of external pressure. This process not only produces a lot of noise, but also produces relatively large shocks and vibrations. In addition, the lateral vibration and unstable operation of the pilot valve spool are also the main reasons for the high-frequency howling noise of the relief valve.
图5是一种典型的先导式油压溢流阀的结构。其主阀口为单级节流阀口，在水介质及高压差下工作时将发生严重的气蚀。先导阀相当于质量一弹簧一阻尼结构，为减小溢流阀的振动、噪声，提高先导阀的工作稳定性，油压溢流阀中常采取的措施有：1)减小锥阀半锥角；2)在先导阀设置阻尼孔；3)先导阀前腔加消振垫改变这一容腔流速场分布，或采用消振塞的微型吸振原理来消除尖叫和振动；4)在先导阀前端加导向活塞，克服锥阀芯的偏摆。在上述措施中，方案1)～方案2)是设计时通常采用的，但对于水压溢流阀并不能从根本上解决问题。方案3)在理论上缺乏足够的依据，实践证明这种方法也不可靠。方案4)使先导阀的作用面积增大，使调压弹簧刚度较大，会降低溢流阀的性能。此外，图5中主阀芯与主阀套配合面的两端分别为高压腔和低压腔，靠配合面进行密封，当采用水介质时，不仅泄漏大，而且缝隙处的高速水流会对配合面产生严重的拉丝侵蚀。Figure 5 is the structure of a typical pilot oil pressure relief valve. Its main valve port is a single-stage throttling valve port, and severe cavitation will occur when working in water medium and high pressure difference. The pilot valve is equivalent to a mass-spring-damping structure. In order to reduce the vibration and noise of the relief valve and improve the working stability of the pilot valve, the measures often taken in the oil pressure relief valve are: 1) Reduce the semi-cone angle of the cone valve ; 2) Set a damping hole in the pilot valve; 3) Add a vibration damping pad to the front cavity of the pilot valve to change the flow velocity field distribution of this cavity, or use the miniature vibration absorption principle of the vibration damping plug to eliminate screams and vibrations; 4) In the pilot valve A guide piston is added to the front end to overcome the deflection of the cone valve core. Among the above-mentioned measures, scheme 1) to scheme 2) are usually used in design, but they cannot fundamentally solve the problem for the hydraulic relief valve. Option 3) lacks sufficient basis in theory, and practice has proved that this method is also unreliable. Scheme 4) Increase the action area of the pilot valve and increase the stiffness of the pressure regulating spring, which will reduce the performance of the relief valve. In addition, in Figure 5, the two ends of the mating surface of the main valve core and the main valve sleeve are respectively a high-pressure chamber and a low-pressure chamber, which are sealed by the mating surface. When water medium is used, not only the leakage is large, but also the high-speed water flow in the gap will interfere with the mating surface. Severe wire drawing erosion occurs on the surface.
图6是日本神奈川大学研制的一种先导式水压溢流阀结构(准铃木理，铃木健儿，加藤義幸等。水压リリ一フ弁の开発。日本機械学会第74期通常总会講演会講演論文集(III)，1997：258～259)。该阀的主阀口采用了平板式两级节流结构，对阀口的气蚀有抑制作用。在主阀芯导向面上增加了密封，可减小泄漏及拉丝侵蚀。但其先导阀的结构与油压溢流阀相同，因此，先导阀的侧向振摆、噪声及工作稳定性问题并未得到很好解决。Figure 6 is a pilot-operated hydraulic pressure relief valve structure developed by Kanagawa University in Japan (Quasi Suzuki, Suzuki Kenji, Kato Yoshiyuki, etc. Water pressure リリ一フーの开発. The 74th general meeting of the Japanese Society of Machinery Conference Lecture Proceedings (III), 1997: 258-259). The main valve port of the valve adopts a flat two-stage throttling structure, which can inhibit the cavitation of the valve port. A seal is added on the guide surface of the main spool to reduce leakage and wire drawing erosion. However, the structure of the pilot valve is the same as that of the oil pressure relief valve, so the problems of lateral vibration, noise and working stability of the pilot valve have not been well solved.
发明内容Contents of the invention
本发明提供一种先导式水压溢流阀，旨在于降低主阀口工作压差、加宽调压范围、减小导阀侧向振摆、增加导阀阻尼，实现抗气蚀低噪声。The invention provides a pilot-operated water pressure relief valve, which is aimed at reducing the working pressure difference at the main valve port, widening the pressure regulating range, reducing the lateral vibration of the pilot valve, increasing the damping of the pilot valve, and realizing anti-cavitation and low noise.
本发明的一种先导式水压溢流阀，包括主阀和先导阀，主阀的主阀体[17]前端固定前端盖[2]，主阀体[17]上具有入口和出口，主阀体内设有主阀座[4]、主阀套[6]、主阀芯[5]，主阀芯[5]端部带有主阀阻尼孔[15]、尾部装置主阀弹簧[12]；先导阀由先导阀阀座[7]、先导阀阀芯[8]、调压弹簧[9]构成，先导阀阀座[7]上带有先导阀阻尼孔[11]，其特征在于：A pilot-operated water pressure relief valve of the present invention includes a main valve and a pilot valve. The front end cover [2] of the main valve body [17] of the main valve is fixed, and the main valve body [17] has an inlet and an outlet. The valve body is provided with a main valve seat [4], a main valve sleeve [6], and a main valve core [5]. The end of the main valve core [5] has a main valve damping hole [15], and a main valve spring [12 ]; the pilot valve consists of a pilot valve seat [7], a pilot valve spool [8], and a pressure regulating spring [9]. :
(1)所述主阀为锥阀结构，先导阀固定在主阀体[17]上，先导阀阀芯[8]上具有导向圆柱面，其与先导阀阀体的内孔之间形成配合间隙，使调压弹簧腔成为阻尼腔[18]；(1) The main valve is a cone valve structure, the pilot valve is fixed on the main valve body [17], and the pilot valve core [8] has a guiding cylindrical surface, which forms a fit with the inner hole of the pilot valve body The gap makes the pressure regulating spring cavity become a damping cavity [18];
(2)主阀座之前主阀体[17]的入口处，设置节流环[3]、其径向有多个直径不同的节流孔，前端盖[2]上装设压力挡调节旋钮[1]、后者与节流环[3]嵌合并可旋转节流环以调节节流孔的工作位置。(2) At the entrance of the main valve body [17] in front of the main valve seat, a throttling ring [3] is set, and there are multiple throttling holes with different diameters in its radial direction, and a pressure stop adjustment knob is installed on the front end cover [2] [ 1], the latter is embedded with the throttle ring [3] and can rotate the throttle ring to adjust the working position of the throttle hole.
所述的先导式水压溢流阀，先导阀可以为锥阀或球阀结构；主阀芯表面可以开有环状弧形凹槽，并设置有橡塑组合密封件[14]。In the pilot-operated water pressure relief valve, the pilot valve can be a cone valve or a ball valve structure; the surface of the main valve core can be provided with an annular arc-shaped groove, and a rubber-plastic composite seal [14].
本发明另一种先导式水压溢流阀，包括主阀和先导阀，主阀的主阀体[17]前端固定前端盖[2]，主阀体[17]上具有入口和出口，主阀体内设有主阀座[4]、主阀套[6]、主阀芯[5]，主阀芯[5]端部带有主阀阻尼孔[15]、尾部装置主阀弹簧[12]；先导阀由先导阀阀座[7]、先导阀阀芯[8]、调压弹簧[9]构成，先导阀阀座[7]上带有先导阀阻尼孔[11]，其特征在于：Another pilot-operated water pressure relief valve of the present invention includes a main valve and a pilot valve. The front end cover [2] of the main valve body [17] of the main valve is fixed, and the main valve body [17] has an inlet and an outlet. The valve body is provided with a main valve seat [4], a main valve sleeve [6], and a main valve core [5]. The end of the main valve core [5] has a main valve damping hole [15], and a main valve spring [12 ]; the pilot valve consists of a pilot valve seat [7], a pilot valve spool [8], and a pressure regulating spring [9]. :
(1)所述主阀为锥阀结构，先导阀固定在主阀体[17]上，先导阀阀芯[8]上具有导向圆柱面，其与先导阀阀体的内孔之间形成配合间隙，使调压弹簧腔成为阻尼腔[18]；(1) The main valve is a cone valve structure, the pilot valve is fixed on the main valve body [17], and the pilot valve core [8] has a guiding cylindrical surface, which forms a fit with the inner hole of the pilot valve body The gap makes the pressure regulating spring cavity become a damping cavity [18];
(2)在前端盖[2]上主阀座之前主阀体[17]的入口处，设置节流孔。(2) At the inlet of the main valve body [17] before the main valve seat on the front end cover [2], an orifice is arranged.
所述的先导式水压溢流阀，其特征在于：先导阀为锥阀或球阀结构；主阀芯表面开有环状弧形凹槽，并设置有橡塑组合密封件[14]。The pilot-operated water pressure relief valve is characterized in that: the pilot valve is a cone valve or ball valve structure; the surface of the main valve core is provided with an annular arc-shaped groove, and is provided with a rubber-plastic composite seal [14].
使用该溢流阀时，先根据其工作压力大小调节压力档调节旋钮的位置，以设定节流孔直径。当高压水从入口进入溢流阀时，通过节流孔的节流作用使压力降低，该压力作用在先导阀上，若能克服先导阀弹簧力，则先导阀开启溢流，使主阀阻尼孔两端产生压力差，当主阀芯上的压差作用力能克服主阀芯的弹簧力和摩擦力时，主阀开启并在某一工作位置处于平衡状态，使主阀口(或溢流阀入口)压力稳定，其压力值大小可通过调节调压弹簧9的预压缩量改变。先导阀阻尼孔11的设置有利于改善主阀芯和先导阀阀芯的工作稳定性。先导阀在动态调节过程中，当先导阀阀芯向右运动时，调压弹簧腔(即阻尼腔)容积减小，压力升高；反之，则压力降低。因此，阻尼腔产生一个与先导阀阀芯运动方向相反的附加作用力，从而增加先导阀阀芯的运动阻尼，提高其工作稳定性。在主阀体上开有通流槽13，使导阀出口流量经通流槽排到出口。When using the relief valve, first adjust the position of the pressure gear adjustment knob according to its working pressure to set the diameter of the orifice. When high-pressure water enters the overflow valve from the inlet, the pressure is reduced by the throttling effect of the orifice, and the pressure acts on the pilot valve. If the spring force of the pilot valve can be overcome, the pilot valve will open to overflow and the main valve will be damped. There is a pressure difference at both ends of the hole. When the pressure difference force on the main valve core can overcome the spring force and friction force of the main valve core, the main valve opens and is in a balanced state at a certain working position, so that the main valve port (or overflow) The pressure at the valve inlet) is stable, and its pressure value can be changed by adjusting the pre-compression of the pressure regulating spring 9. The arrangement of the pilot valve damping hole 11 is beneficial to improve the working stability of the main valve core and the pilot valve core. During the dynamic adjustment process of the pilot valve, when the spool of the pilot valve moves to the right, the volume of the pressure regulating spring chamber (that is, the damping chamber) decreases, and the pressure increases; otherwise, the pressure decreases. Therefore, the damping chamber generates an additional force opposite to the movement direction of the pilot valve spool, thereby increasing the movement damping of the pilot valve spool and improving its working stability. There is a flow groove 13 on the main valve body, so that the outlet flow of the pilot valve is discharged to the outlet through the flow groove.
本发明在溢流阀入口处设置节流环或者节流孔，节流环上开有一个或多个不同直径的节流孔，利用某个节流孔产生压力差，以降低主阀口的工作压差，从而抑制主阀口的气穴和气蚀。同时，通过压力挡调节旋钮选择节流孔直径，则仅用一根调压弹簧就可使溢流阀有较宽的调压范围(普通溢流阀则需配备多根弹簧)。先导阀阀芯上所设的导向圆柱面，与先导阀阀体内孔之间形成配合间隙，使调压弹簧腔成为阻尼腔，不仅减小了先导阀阀芯的侧向振摆，而且增加了先导阀阀芯的运动阻尼，提高了导阀的工作稳定性，In the present invention, a throttling ring or a throttling hole is arranged at the inlet of the overflow valve, and one or more throttling holes with different diameters are opened on the throttling ring, and a certain throttling hole is used to generate a pressure difference to reduce the pressure of the main valve port. Operating differential pressure, thereby suppressing cavitation and cavitation at the main valve port. At the same time, if the diameter of the orifice is selected through the pressure adjustment knob, only one pressure regulating spring can make the relief valve have a wider pressure regulating range (ordinary relief valves need to be equipped with multiple springs). The guide cylindrical surface on the pilot valve spool forms a matching gap with the inner hole of the pilot valve body, making the pressure regulating spring chamber a damping chamber, which not only reduces the lateral vibration of the pilot valve spool, but also increases The motion damping of the pilot valve spool improves the working stability of the pilot valve,
此外，在主阀芯上开有环状弧形凹槽，可减小气蚀对主阀芯的损坏并降低气穴噪声。在主阀芯导向面上设有摩擦系数小、耐磨损的橡塑组合密封圈，可以减小主阀导向面的泄漏和拉丝侵蚀。In addition, there is an annular arc-shaped groove on the main valve core, which can reduce damage to the main valve core by cavitation and reduce cavitation noise. On the guide surface of the main valve core, there is a rubber-plastic combination sealing ring with small friction coefficient and wear resistance, which can reduce the leakage and wire drawing erosion of the guide surface of the main valve.
该溢流阀适用于以海水、淡水、高水基等作为工作介质的水液压系统中作为压力控制阀，具有工作压力高、调压范围宽、抗气蚀性能好、噪声低、工作稳定性好等优点。The overflow valve is suitable as a pressure control valve in water hydraulic systems with seawater, fresh water, high water base, etc. as the working medium. It has high working pressure, wide pressure regulating range, good cavitation resistance, low noise, and good working stability. advantage.
附图说明Description of drawings
图1为本发明的一种实施例结构示意图。Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
图2表示先导阀为球阀结构的一种实施状态。Fig. 2 shows an implementation state in which the pilot valve is a ball valve structure.
图3为本发明的第二种实施例示意图。Fig. 3 is a schematic diagram of the second embodiment of the present invention.
图4为本发明的第三种实施例示意图。Fig. 4 is a schematic diagram of a third embodiment of the present invention.
图5是一种典型的油压先导式溢流阀结构图。Figure 5 is a structural diagram of a typical hydraulic pilot relief valve.
图6为日本神奈川大学研制的先导式水压溢流阀结构图。Figure 6 is a structural diagram of a pilot hydraulic relief valve developed by Kanagawa University in Japan.
上述图中标识为：压力挡调节旋钮1、前端盖2、节流环3、主阀座4、主阀芯5、主阀套6、先导阀阀座7、先导阀阀芯8、调压弹簧9、先导阀阀体10、先导阀阻尼孔11、主阀阻尼孔15、主阀弹簧12、通流槽13、橡塑组合密封件14、主阀阻尼孔15、节流孔16、主阀体17、阻尼腔18、螺塞19。The marks in the above figure are: pressure adjustment knob 1, front end cover 2, throttle ring 3, main valve seat 4, main valve core 5, main valve sleeve 6, pilot valve seat 7, pilot valve core 8, pressure regulator Spring 9, pilot valve body 10, pilot valve damping hole 11, main valve damping hole 15, main valve spring 12, flow groove 13, rubber-plastic composite seal 14, main valve damping hole 15, throttle hole 16, main Valve body 17, damping cavity 18, screw plug 19.
具体实施方式Detailed ways
图1所示，本发明的一种实施例包括：压力挡调节旋钮1、前端盖2、节流环3、节流孔16、主阀体17、主阀座4、主阀芯5、橡塑组合密封件14、主阀阻尼孔15、主阀套6、主阀弹簧12、先导阀阀座7、先导阀阻尼孔11、先导阀阀芯8、调压弹簧9、先导阀阀体10。先导阀和主阀通过先导阀阀体10固定在主阀体17上同轴连接、先导阀阀座7压住主阀弹簧12，主阀为锥阀结构，先导阀可采用锥阀或球阀结构。As shown in Figure 1, an embodiment of the present invention includes: a pressure adjustment knob 1, a front cover 2, a throttle ring 3, a throttle hole 16, a main valve body 17, a main valve seat 4, a main valve core 5, a rubber Plastic combination seal 14, main valve damping hole 15, main valve sleeve 6, main valve spring 12, pilot valve seat 7, pilot valve damping hole 11, pilot valve core 8, pressure regulating spring 9, pilot valve body 10 . The pilot valve and the main valve are fixed on the main valve body 17 through the pilot valve body 10 and connected coaxially, the pilot valve seat 7 presses the main valve spring 12, the main valve is a cone valve structure, and the pilot valve can adopt a cone valve or ball valve structure .
图2表示先导阀为球阀结构的一种实施状态。Fig. 2 shows an implementation state in which the pilot valve is a ball valve structure.
图3表示本发明的另一种实施例，当节流环上只有一个节流孔时，则无需节流环，此时本发明的先导式水压溢流阀，所述主阀为锥阀结构，先导阀和主阀通过先导阀阀体10固定在主阀体17上同轴连接、先导阀阀座7压住主阀弹簧12，先导阀阀芯8上具有导向圆柱面，其与先导阀阀体10的内孔之间形成配合间隙，使调压弹簧腔成为阻尼腔18；前端盖2上主阀座之前主阀体17的入口处，设置节流孔16。Fig. 3 shows another embodiment of the present invention, when there is only one throttle hole on the throttle ring, the throttle ring is not needed, at this moment, the pilot hydraulic relief valve of the present invention, the main valve is a cone valve Structure, the pilot valve and the main valve are coaxially connected on the main valve body 17 through the pilot valve body 10, the pilot valve seat 7 presses the main valve spring 12, and the pilot valve core 8 has a guiding cylindrical surface, which is connected with the pilot valve A matching gap is formed between the inner holes of the valve body 10, so that the pressure regulating spring chamber becomes a damping chamber 18; at the entrance of the main valve body 17 before the main valve seat on the front end cover 2, an orifice 16 is set.
所述的先导式水压溢流阀，先导阀可以为锥阀或球阀结构；主阀芯表面可以开有环状弧形凹槽，并设置有橡塑组合密封件14。Said pilot hydraulic pressure relief valve, the pilot valve can be a cone valve or ball valve structure; the surface of the main valve core can be provided with an annular arc-shaped groove, and a rubber-plastic composite seal 14 is provided.
图4为本发明的第三种实施例，先导阀和主阀不位于同一轴线，先导阀阀体10的端部加有螺塞19。Fig. 4 is a third embodiment of the present invention, the pilot valve and the main valve are not located on the same axis, and a screw plug 19 is added to the end of the valve body 10 of the pilot valve.
Claims (4)
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2004100130707A CN100366967C (en) | 2004-04-21 | 2004-04-21 | Pilot operated water pressure relief valve |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2004100130707A CN100366967C (en) | 2004-04-21 | 2004-04-21 | Pilot operated water pressure relief valve |
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| CN1619198A CN1619198A (en) | 2005-05-25 |
| CN100366967C true CN100366967C (en) | 2008-02-06 |
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| CNB2004100130707A Expired - Fee Related CN100366967C (en) | 2004-04-21 | 2004-04-21 | Pilot operated water pressure relief valve |
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102009053635A1 (en) * | 2009-11-17 | 2011-05-19 | Robert Bosch Gmbh | Pilot operated pressure relief valve |
| CN102042432B (en) * | 2010-12-10 | 2012-05-23 | 北京工业大学 | Direct-acting water pressure overflow valve with damping piston |
| CN102454650B (en) * | 2011-09-07 | 2014-07-23 | 广西柳工机械股份有限公司 | Hydraulic differential pilot opening mechanism |
| CN102454652B (en) * | 2011-11-18 | 2014-05-07 | 广西柳工机械股份有限公司 | Adjustable hydraulic pilot opening mechanism |
| CN102943909B (en) * | 2012-10-19 | 2014-04-09 | 华中科技大学 | Differential type water hydraulic relief valve |
| CN104265716B (en) * | 2014-10-23 | 2017-06-16 | 西华大学 | A kind of super-pressure pilot operated compound relief valve |
| CN105422885A (en) * | 2015-11-27 | 2016-03-23 | 苏州市职业大学 | One-way pressure-control tap water valve |
| CN107091369B (en) * | 2017-05-10 | 2023-06-30 | 宁波兴茂电子科技有限公司 | Pilot valve flow characteristic testing device and application method thereof |
| CN108981248A (en) * | 2018-08-23 | 2018-12-11 | 方纪 | A kind of unidirectional refrigeration expansion valve of passive self-adaptive formula |
| CN111219511A (en) * | 2019-10-29 | 2020-06-02 | 北京天地玛珂电液控制系统有限公司 | Electromagnetic unloading valve for aqueous medium mine |
| CN110966429B (en) * | 2019-12-31 | 2025-02-25 | 无锡市三信传动控制有限公司 | High speed two position three way hydraulic valve |
| CN111456977A (en) * | 2020-04-09 | 2020-07-28 | 上海诺玛液压系统有限公司 | High-pressure large-flow inverse proportion overflow valve |
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| CN85109329B (en) * | 1985-12-26 | 1988-07-20 | 庄凤龄 | Pilot-operated overflow valve |
| CN2242988Y (en) * | 1996-02-08 | 1996-12-18 | 煤炭科学研究总院北京开采研究所 | Guiding-type safety valve |
| CN1111259C (en) * | 2000-11-14 | 2003-06-11 | 湘潭工学院 | Pilot-type overflow valve |
| CN2697420Y (en) * | 2004-04-21 | 2005-05-04 | 华中科技大学 | Pre-guiding type water pressure overflow valve |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85109329B (en) * | 1985-12-26 | 1988-07-20 | 庄凤龄 | Pilot-operated overflow valve |
| CN2242988Y (en) * | 1996-02-08 | 1996-12-18 | 煤炭科学研究总院北京开采研究所 | Guiding-type safety valve |
| CN1111259C (en) * | 2000-11-14 | 2003-06-11 | 湘潭工学院 | Pilot-type overflow valve |
| CN2697420Y (en) * | 2004-04-21 | 2005-05-04 | 华中科技大学 | Pre-guiding type water pressure overflow valve |
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