JP2007040326A - Uniaxial pressure regulator for tap water - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To protect a uniaxial pressure regulator for tap water and a solenoid valve installed at the inlet of a device such as an ice making machine against damage by a high water pressure in a water hammering. <P>SOLUTION: The valve seat assembly 7 of the uniaxial pressure regulator for tap water in which a stopper C limiting a stroke is fitted to a plunger 2 is movably installed on the upstream side. Thus, even if the water hammering occurs between the pressure regulator and the solenoid valve installed at the inlet of the ice making machine, a food machine, and a water heater, the solenoid valve can be prevented from being damaged by sliding the valve seat assembly 7 to the upstream side to escape the high water pressure to the upstream side. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention prevents uniaxial pressure regulators for tap water from water pipes and solenoid valves installed at the entrance of equipment such as ice makers, food machines, water heaters, etc., from damage or abnormal operation due to high water pressure exceeding the design value. The present invention relates to a uniaxial pressure regulator for tap water.

Equipment such as ice machines, food machines, and water heaters directly connected to the water pipes are used for the tap water shown in Fig. 1 upstream of the equipment to prevent equipment damage and abnormal operation due to high water pressure on the supply side. Some have built-in uniaxial pressure regulators. In FIG. 1, 1 is a pressure regulator body body, 2 is a plunger that operates upstream by a differential pressure between the upstream side and the downstream side, and adjusts the downstream pressure by a small end valve, 4 is a valve seat, 3 Is a pressure adjusting spring, 5 is a valve seat assembly fixed to one body, X is a primary side (supply side) connection port of the pressure regulator, and Y is a secondary side (outlet side) connection port. Tap water passes through the center hole of the plunger 2 from the valve seat side of the 4 and is supplied to the above devices.
There is a case where a water flow is controlled automatically by providing a solenoid valve for shutting off the water flow between the uniaxial pressure regulator for tap water and the devices. In this case, since the solenoid valve cuts off the water flow suddenly, a water hammer phenomenon occurs between the solenoid valve and the uniaxial pressure regulator for tap water, and an abnormal high water pressure is applied to the plunger 2 of the uniaxial pressure regulator for tap water. A structure that prevents the rubber valve seat 4 from being cut off at the small end valve portion of the plunger 2 has been proposed. On the other hand, the abnormally high water pressure also causes damage to the solenoid valve. A defect has also occurred. If the solenoid valve is damaged, there is a problem that the functions of the above devices cannot be satisfied.
In order to prevent these problems, a damper for preventing water hammer, a slowly operating solenoid valve, and the like are disclosed. However, practical water hammer countermeasure dampers and slow-acting solenoid valves have the disadvantage that they are large and expensive.
JP2002-295705 JP2002-039489

  The problem to be solved is that even if a water hammer phenomenon occurs due to the operation of a solenoid valve installed at the inlet of an ice maker, food machine, water heater, etc. downstream of the single-shaft pressure regulator for tap water, The abnormal high water pressure is released to the upstream side through the uniaxial pressure regulator for use so that the abnormal high water pressure does not act on the solenoid valve.

  In the present invention, in FIG. 2, when an abnormally high water pressure is applied to the plunger 2 due to the water hammer phenomenon, the small end face valve portion of the plunger 2 tries to contact the valve seat 6 with a strong force. Since the stroke is limited to B by the body stopper C of 1, the plunger of 2 stops, the abnormal high water pressure acts on the valve seat of 6, and the valve seat assembly of 7 has the upstream water pressure and the downstream side. Slides to the upstream side with the differential pressure from the high water pressure, and minus the force set by the 8 springs to the differential pressure, and releases the high water pressure to the upstream side. The movable stroke A of the valve seat assembly No. 7 is set to a dimension that can handle a sufficient backflow. Thus, the main feature is to reduce the abnormal high pressure downstream of the uniaxial pressure regulator for tap water so as not to affect the solenoid valve.

  The purpose of protecting the solenoid valve installed at the inlet of tap water uniaxial pressure regulators and ice makers, food machinery, water heaters, etc. from the damage caused by the high water pressure of water hammer phenomenon is It can be realized at low cost without changing the basic structure by moving the valve seat of the uniaxial pressure regulator for tap water without installing a gentle solenoid valve.

  As described above, the uniaxial pressure regulator for tap water according to the present invention can prevent damage to solenoid valves provided at the inlet of equipment such as ice makers, food machinery, and water heaters due to the high water pressure by the downstream water hammer. It does not require additional dampers or expensive slow-acting solenoid valves, and can contribute to reducing the size and cost of equipment such as food machinery and water heaters directly connected from water pipes.

  FIG. 2 is a cross-sectional view of an embodiment of the present invention, where 1 is a body, 2 is a plunger, 3 is a pressure adjusting spring, and symbols X and Y are the same as those in FIG. 6 is a valve seat, and 8 is a spring to which a certain amount of force is applied in order to prevent leakage of 6. 7 is a valve seat assembly that enables sliding. C is a stopper of the plunger 2, D is a normal stopper of the valve seat assembly 7, and A is a maximum stroke of the valve seat assembly 7.

  Since the body 1 and the plunger 2 are provided with a stopper C that restricts the stroke to B, even if the pressure downstream of the uniaxial pressure regulator for tap water increases, The valve seat assembly 7 slides to the upstream side with the upstream / downstream differential pressure (set pressure of the minus spring 8) via the 6 valve seats that have not been actuated upstream and received high pressure. The high-pressure water downstream passes through the gap between the valve and the valve seat 6 and escapes upstream. This action can prevent or reduce damage caused by a sudden high water pressure on a solenoid valve provided at the inlet of an apparatus such as an ice maker, food machine, or water heater.

  The set pressure of the spring 8 is set to about 0.5 MPa so that the valve section does not leak during normal pressure regulation.

  As described above, the uniaxial pressure regulator for tap water according to the present invention can prevent damage to solenoid valves provided at the inlet of equipment such as ice makers, food machines, and water heaters due to water hammers. This eliminates the need for expensive slow-acting solenoid valves and contributes to reducing the size and cost of equipment such as ice makers, food machinery, and water heaters that are directly connected from water pipes.

It is explanatory drawing of the conventional uniaxial pressure regulator for tap water. It is explanatory drawing of the uniaxial pressure regulator for tap water of this invention. Example 1

Explanation of symbols

1 Body 2 Plunger 3 Spring 4 Valve seat 5 Valve seat assembly 6 Valve seat 7 Valve seat assembly 8 Spring
X Water supply side
Y Water outlet side A Maximum stroke of valve seat assembly for water hammer B Maximum plunger stroke for water hammer
C Plunger stopper
D Valve seat assembly stopper

Claims (2)

A plunger-integrated pressure regulating valve composed of a rubber sheet and a small end surface of a metal and / or resin plunger, and the plunger is a uniaxial pressure regulator for tap water with a stopper that limits the stroke with the body. A uniaxial pressure regulator for tap water, wherein the pressure regulating valve seat assembly part is movable along the axis upstream. The uniaxial pressure regulator for tap water according to claim 1, wherein the pressure regulating valve seat assembly portion is pressed downstream by a spring and positioned by a stopper of the body.

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