JPH0738773Y2 - Pressure reducing constant flow valve - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a constant flow valve that always keeps the secondary flow rate constant even if the primary pressure fluctuates, and particularly in the secondary side piping within the range below the maximum set flow rate, or The present invention relates to a pressure reducing type constant flow valve which can freely adjust the amount of water by the opening degree of a valve provided at the end of a secondary side pipe and also has a function as a pressure reducing valve.

In the conventional constant flow valve, for example, as shown in FIG. ₁ , when the differential pressure between the primary side (inlet side) pressure P ₁ and the secondary side (outlet side) pressure R ₂ becomes large, the rubber orifice a is pressured. deflection P ₂ side receives, narrowing the flow path inner diameter d becomes smaller, limiting the flow rate, contrary to when the pressure difference between P ₁ and P ₂ is small d is increased, increasing the flow rate In this way, a constant flow rate is always obtained regardless of the fluctuation of the primary pressure and the loss resistance of the secondary conduit, valve, etc. Therefore, as a matter of course, it is difficult to produce an arbitrary amount of water each time it is used, and when the faucet at the end of the secondary side is closed, the primary side and the secondary side have the same pressure, Considering the adverse effects of water hammers on piping equipment, it was the current situation that pressure reducing valves were installed separately in high pressure areas.

In view of the above point, in the present invention, the flow rate is sequentially changed according to the opening degree of the valve (for example, faucet) of the secondary side pipe within the range of the set flow rate or less, so that there is no excessive water discharge amount, and The desired flow rate can be obtained each time, and by reducing the secondary pressure to an appropriate set pressure, the plumbing fixtures are not damaged, and the set flow rate can be adjusted widely, and the adjustment can be done easily from the outside. It is an object of the present invention to provide a decompression type constant flow valve that has a very simple structure and can be manufactured.

Hereinafter, the present invention will be described with reference to the embodiments shown in the drawings.

In FIG. 2, 1 is a valve box of the constant flow valve of the present invention, and 2
Is an inlet, and 3 is an outlet. 4 is an inlet 2 and an outlet 3
It is a partition wall between which the valve opening 5 is opened in the central portion in the axial direction and a downward valve seat is formed at the lower end of the valve opening 5. A secondary side pressure chamber 8 is formed above the valve port 5, an outflow lateral hole 9 is further provided between the secondary side pressure chamber 8 and the outflow port 3, and a front end portion of the outflow lateral hole 9 has a constant length. An arc-shaped throttle valve seat 10 is formed.
The throttle valve seat 10 is extended at right angles to the drawing to provide a protrusion 12 having a screw 11 on its inner surface as shown in FIG. A bottom lid 14 forming a cylinder 13 on the inner surface is screwed to the lower end of the valve box 1. 15 is a valve body, and the cylinder 13
An annular packing 16 that slides, a flat packing 17 that closes the valve seat 6 in the middle, and a diaphragm 18 at the upper end are installed, and a communication hole 19 from the secondary pressure chamber 8 to the lower end is bored inside. The communication hole 19 may be omitted and an air hole may be provided in the bottom lid 14. Reference numeral 20 denotes a bonnet, which is screw-connected to the upper end of the valve box 1 with the diaphragm 18 sandwiched therebetween. The bonnet 20 has an adjusting screw 21 at the upper end, and an adjusting lid 22 is screwed onto the adjusting screw 21. Reference numeral 23 is an adjusting spring, which is locked to the adjusting lid 22 so as to always apply a downward pressing force to the valve body 15. As shown in FIGS. 3 and 4, the protrusion 12 has a half-moon-shaped throttle portion 24 at one end that is flatly cut off to fit the arc-shaped throttle valve seat 10 at the other end. Indicator groove with a notch in the middle
Throttle valve 27 with 25 and O-ring 26 in the middle
Is screwed into the above-mentioned screw 11 to make it. A flow rate indicator board 28 is attached to the tip of the protruding portion 12, a driver or the like is inserted into the instruction groove 25, and the throttle valve 27 is rotated to set the flow rate.

Next, an operation mode of the present invention will be described with reference to an embodiment shown in the drawings.

In FIGS. 2 to 4, the primary-side high-pressure water from the inflow port 2 passes from the primary-side pressure chamber 7 through the gap between the valve seat 6 and the flat packing 17, and becomes low-pressure secondary water. It flows into the side pressure chamber 8, flows through the gap between the outflow lateral hole 9 and the throttle portion 24 of the throttle valve 27, and flows from the outlet 3 to the secondary side pipe (not shown). If the faucet (not shown) provided at the end of the secondary side pipe is opened from this state, the pressure in the secondary side pressure chamber 8 decreases, so the valve due to upward water pressure acting on the diaphragm 18 The rising force of the body 15 decreases, and the restoring force of the adjusting spring 23 lowers the valve body 15 to increase the flow rate. Conversely,
When the faucet is closed, the pressure in the secondary side pressure chamber 8 increases,
While compressing the adjusting spring 23, the valve body 15 rises to reduce the flow rate. Since the throttle valve seat 10 and the throttle portion 24 have a constant length in the direction perpendicular to the outflow lateral hole 9, the flow rate adjustment range can be widened. In fact, that is, a desired flow rate can be obtained according to the opening of the faucet. However, in advance,
Since the desired set flow rate is determined by adjusting the throttle valve 27, an unnecessarily excessive flow rate does not flow.

In the state of the figure, the throttle portion 24 half-closes the throttle valve seat 10, and the set flow rate shows an intermediate state between the maximum and the minimum.
If a driver or the like is inserted into the indicator groove 25 from this state and rotated clockwise, the opening area of the outflow lateral hole 9 becomes large, so the set flow rate increases, and if it is rotated counterclockwise, it decreases. . The flow rate indicator board 28 may be used within the range of 1 to 5 scales (about 120 °). Actually, each flow rate from 1 to 5 should be clearly indicated on the attached sticker or the like. When the primary-side pressure fluctuates, for example, when it increases, the high-pressure water enters the secondary-side pressure chamber 8 and increases the pressure. The gap between the packings 17 is narrowed to try to keep the flow rate constant. On the contrary, when the primary-side pressure decreases, the valve body 15 descends to keep the flow rate constant. That is, as long as the loss resistance of the secondary side pipe does not change, a constant amount of water is always obtained regardless of the level of the primary side pressure. When the faucet or the like is completely closed, the secondary pressure becomes maximum, the valve body 15 rises, and the flat packing 17 stops the rise with the valve seat 6 closed. The strength of the adjusting spring 22 may be adjusted in advance so that the secondary pressure at this time becomes the set pressure.
If the adjusting lid 23 is rotated to compress the adjusting spring 23, the set pressure becomes high, and the set pressure becomes low in the opposite case.

As described above, in the present invention, if the flow rate is within the set flow range, an appropriate flow rate can be obtained according to the opening of the faucet, and there is no unnecessary excessive water discharge amount. Since it is possible to reduce the pressure, it is possible to prevent the impact noise from a water hammer etc. and the adverse effects on the piping.A throttle valve seat with a certain length is formed at the front end of the outflow lateral hole, and a part of the cylinder is ground flat Since the flow rate is adjusted by rotating the valve, the structure is very simple, the flow rate adjustment range can be wide, the adjustment from the outside is easy, and the flow rate guideline is shown.
There is an effect that the scale of the flow rate indicator panel can be easily created.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a conventional example, FIG. 2 is a vertical cross-sectional view of an embodiment of the present invention in a water-passing state, and FIG. 3 is a cross-sectional view of a throttle valve portion of FIG. 4 is an external view of the throttle valve portion. 1 is a valve box, 2 is an inflow port, 3 is an outflow port, 4 is a partition wall, 5 is a valve port, 6 is a valve seat, 7 is a primary side pressure chamber, 8 is a secondary side pressure chamber,
9 is an outflow lateral hole, 10 is a throttle valve seat, 12 is a protrusion, 13 is a cylinder, 14 is a bottom lid, 15 is a valve body, 16 is an annular packing, 17 is a flat packing, 18 is a diaphragm, 20 is a bonnet, and 23 is The adjusting spring, 27 is a throttle valve.

Claims (1)

[Scope of utility model registration request] 1. A valve opening on a partition wall between the inlet and the outlet, a primary pressure chamber between the inlet and the valve opening, and a downward valve seat at the lower end of the valve opening of the partition wall, the valve opening. And an outflow lateral hole between the outlet and
A secondary pressure chamber is provided between the valve port and the outflow lateral hole, and an arcuate throttle valve seat having a constant length at the front end of the outflow lateral hole is extended outward from the throttle valve seat to form a protrusion. A valve box to be formed respectively, a bottom cover connected to the lower end of the valve box, an annular packing closely attached to the cylinder provided in the bottom cover, a flat packing for closing the valve seat, and a valve body having a diaphragm attached to the upper end. A bonnet connected to the upper end of the valve box via a diaphragm, an adjustment spring housed in the bonnet and pressing the valve body from above, and a screw connection to the protrusion, and along the throttle valve seat. Rotate,
A decompression-type constant flow valve for water supply, which consists of a throttle valve having a half-moon-shaped throttle part in which a part of a cylinder is ground flat.