Direct-touch type metal diaphragm valve
一种接触型、隔膜阀的技术,应用在隔膜阀、隔膜、阀细节等方向,能够解决流量增大等问题,达到形态稳定化的效果
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specific example 1
[0109] Referring to Fig. 2, Fig. 2 is a partially enlarged view showing the closed state of the valve using the metal diaphragm 2 of the above-mentioned embodiment 1, and Fig. 3 is a diagram showing the use of the metal diaphragm 2 of the embodiment 1 when the valve stroke ΔS is 1.5mm. Partial enlarged view of the valve opening state.
[0110] In Fig. 2 and Fig. 3, the valve stroke ΔS is selected as 1.5mm, and the valve stroke ΔS is larger than the maximum bulge height Δh=1.2mm of the metal diaphragm 2, so the metal diaphragm 2 is completely restored to its original state.
specific example 2
[0112] On the other hand, Fig. 4 and Fig. 5 show the closed state ( Fig. 4 ) and the valve open state when the valve stroke ΔS is set to 0.7 mm in the valve of Fig. 1 using the metal diaphragm 2 of the first embodiment described above. (FIG. 5) A partially enlarged view of the state. When the valve is closed, the metal diaphragm 2 does not return to the complete original state as shown in FIG. 3, but becomes a somewhat deformed state.
[0113] That is, when the valve stroke ΔS is reduced, the amount of deformation of the metal diaphragm 2 becomes smaller, and the deformation stress acting on the metal diaphragm 2 becomes relatively smaller.
[0114] In the case of the valve stroke ΔS=1.5mm and ΔS=0.7mm, there is a large difference in the form of the metal diaphragm 2 as described above, but the distance between the valve seat 3 and the inner surface of the metal diaphragm 2 can be judged. Gap G did not change much.
specific example 3
[0116] 6 and 7 show that the metal diaphragm valve of FIG. 1 using the metal diaphragm 2 of the above-mentioned embodiment 1 is used to measure the flow rate using the Cv value measurement test device of the above-mentioned FIG. 8, and the Cv value is obtained by using the above-mentioned (2) formula In addition, Table 1 is a list of the above-mentioned lift and flow and Cv values.
[0117] Among them, the test was carried out under the conditions of an operating air pressure of 0.55 MPa and a protrusion height of the valve seat of 0.128 mm (height after baking at 80°C).
[0118] 【Table 1】
[0119] Lift(mm)
[0120] It can be seen from FIG. 6 and FIG. 7 that the valve stroke ΔS=about 0.65-0.8, and the Cv value=0.55-0.6 required by the valve can be realized. That is, it is preferable to realize a Cv value of 0.6 by setting the valve stroke ΔS=0.7 mm, and it can be seen that the metal diaphragm 2 does not need to be deformed to the maximum until the valve stroke reach...
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