JPS5912651Y2 - Check pressure reducing valve for water heater - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a check pressure reducing valve used in domestic water heaters, and has been improved to eliminate problems caused by freezing, especially in cold regions.

Traditionally, a pressure reducing valve system has been adopted as a water supply system for domestic water heaters due to its practical advantages, but when using this system in cold regions, it is necessary to have an appropriate means to prevent damage from freezing inside the equipment. Without this, the water inside the valve would freeze and the weaker parts would be damaged due to volume expansion, causing problems such as loss of pressure reducing valve function.

This invention aims to solve these disadvantages and to create a check pressure reducing valve for water heaters that is equipped with a mechanism that does not affect volume expansion even if residual water freezes inside the container, and can fully perform its original function. do.

Referring to the drawings below, a primary side supply port 1a connected to a water pipe is opened on one side, and a secondary side delivery port 1b connected to a water supply pipe on the hot water tank side is opened on the other side.
Inwardly of a is an inclined check valve pipe portion 1C that communicates with this.
The main body 1 is formed by providing a supply piping portion 1d formed in the vertical direction at the center.

A large diaphragm 18 that fits the diameter of the opening is stretched above the main body 1, and the periphery of the spring force bar 9 attached to the top of the diaphragm 18 and the periphery of the main body 1 are fitted together via bolts. to be fixed.

Next, at the vertical center position of the supply pipe portion 1d in the main body 1, a valve stem 6 whose upper part is shaped like a glass-shaped recess 6C and a horizontal hole 6a is provided at the bottom thereof, and a disc 19 at the leg part are installed. The relief valve 53 is fixed with a nut and is housed in a vertically movable manner, and in the concave portion 6C of the valve stem 6 is a relief valve 53 having a vertical hole 6d in the upper body and a horizontal groove 6b in the leg. After the valve stem 6 is accommodated so as to be pressed against the inner bottom of the recess 6C by the support force of By inserting the valve 53, a spring 59 is suspended between the washer at the nut 27 position and the diaphragm retainer 51, which is fixed to the upper part of the valve 53.
The disc 19 is arranged so that it can be seated on the valve seat of the supply piping section 1d with a supporting force of .

Note that 52a is a horizontal groove provided in the valve seat nut 52.

In addition, by suspending the adjustment spring 15 between the adjustment screw 7 attached to the spring force bar 9 and the diaphragm holder 51, the valve seat nut 52 can be attached to the valve seat nut 52 using a disc 5 provided in the diaphragm holder 51.
Seat 4.

In this case, the diaphragm 18 is clamped by the diaphragm retainer 51 from below and the diaphragm receiver 11 from above,
It is integrally tightened with a ring nut 55, and the main body 1
A cap 5 is attached below the vertical center, and a pressure reducing valve is assembled.

Furthermore, a valve seat 34 that joins to the pipe wall is provided in the inclined check valve pipe portion 1C, and a disc 20 is provided in the pipe corresponding to the upper surface of the valve seat 34.
The check valve body 4 equipped with the check valve body 4 is arranged so that it can be seated on the valve seat 34 with the supporting force of the push spring 16 from inside, and
After a strainer 10 is interposed at the lower part of the strainer 4, the strainer 10 is supported and fixed with a cap 3.

In addition, a ball 14 is housed in the center hole 17 of the cap 3, and a vacuum brake force 8 is attached from the outside to assemble a check valve, thereby constructing a check pressure reducing valve for a water heater as a whole. .

As a result, high-pressure water from the primary side supply port 1a is filtered by the strainer 10, pushes the check valve body 4 open against the spring 16, and flows into the primary side supply piping section 1d. Bar 6
Since the elasticity of the adjustment spring 15 provided above the diaphragm 18 is adjusted so that the disc 19 fixed at the bottom of the diaphragm 19 is in the open position, the inflow water immediately reaches the secondary side delivery port 1b and flows from the primary side. Distribution to the secondary side is carried out smoothly.

In this case, when the water pressure on the secondary side becomes higher than the pressure corresponding to the elasticity adjusted by the adjustment spring 15, the disc 19 moves in the direction of closing the valve seat opening, restricting the flow into the secondary side, and vice versa. When the pressure on the downstream side decreases, the disc 19 moves in the direction of opening the valve seat opening and operates to increase the amount of flow into the secondary side.

Therefore, the secondary side water pressure is maintained at a pre-adjusted constant value, so the high pressure primary side pressure water is automatically and continuously reduced to a pressure corresponding to the elasticity of the adjustment spring 15, and as a result, Stable pressure water is always obtained from the secondary delivery port 1b.

When used in a cold region, if residual water in the valve freezes and expands in volume, the expansion on the primary side will be absorbed by the horizontal hole 6a of the valve stem 6.
spring 5 so that the relief valve 53 absorbs this.
8, the inflowing water passes through the horizontal groove 6b and is discharged to the upper outside through the vertical hole 6d communicating with the recess 6C.

In addition, in the case of the secondary side, even if the disc 19 is in contact with the valve seat opening, the diaphragm 18 acts upward against the elasticity of the spring 59 to absorb the volume expansion, so the diaphragm 18 may be damaged. can be avoided.

Moreover, after long-term use, water scale, dust, or sand may accumulate on the sliding parts inside the valve, obstructing the smooth sliding of the valve stem 6, and as a result, the secondary pressure may decrease to the set value. Even if there is an abnormal rise exceeding Due to the increase in pressure, the diaphragm 18 compresses the spring 59 and moves further upward, so that the disc 54 and the valve seat nut 52 are separated and are discharged to the outside through the horizontal groove 52a and the vertical hole 6d.

As shown above, in this invention, at the vertical center position in the main body 1,
A valve stem 6 with a relief valve 53 provided in a recess 6C supported by a spring 58 is movably housed, and a valve seat nut 52 attached to the head of the valve stem 6 and a disk 54 attached to the diaphragm 18 By arranging them so that they can be joined via the adjustment spring 15 and the spring 59, the volume expansion that occurs when the residual water in the valve freezes can be smoothly discharged to the outside, so that the main parts in the valve and the diaphragm 18 are This has the effect of preventing damage and ensuring reliable valve operation at all times.

[Brief explanation of drawings]

The drawing is a longitudinal sectional view showing the structure of the check pressure reducing valve for a water heater according to this invention. Explanation of symbols: 1...Main body, 1a...Supply port, 1b...Delivery port, 1C...Check valve pipe section, 1d... ...Supply piping section, 3, 5...
・Cap, 4...Check valve body, 6...
Valve stem, 6a...Horizontal hole, 6b, 52a...
・Horizontal groove, 6C... Concavity, 6d... Vertical hole, 7... Adjustment screw, 8... Vacuum breaker, 9... Spring force bar 10...
Strainer, 11...Diaphragm holder, 14.
... Ball, 15 ... Adjustment spring, 16.
...Press spring, 17...Hole, 18...
...Diaphragm, 19, 20, 54...
・Disk, 27...Nut, 21, 22,
23, 24, 25, 26, 60, 61...
...O-ring, 34...Check valve seat, 51...
...Diaphragm holder, 52...Valve seat nut, 53...Relief valve, 55...Ring nut, 58, 59...Spring.

Claims (1)

[Scope of utility model registration request] In a check pressure reducing valve that has a flow path from the valve seat port of the supply pipe section 1d to the secondary delivery port 1b that is controlled by a diaphragm 18 provided above the primary supply port 1a of the main body 1, the supply pipe A valve stem 6 for opening and closing the portion 1d is placed at the vertical center position of the main body 1, and a horizontal hole 6a for passing the pressure on the primary side is provided in a concave portion 6C formed inside the stem, and the pressure that enters the concave portion 6C is removed. Further, a disc 54 of the diaphragm 18 that allows discharge to the outside through the vertical hole 6d of the relief valve 53 and slides up and down about the relief valve 53, and a valve seat nut 52 attached to the upper part of the valve stem 6 are connected. , the adjustment spring 15 and the spring 59 can be connected via the supporting springs, and the valve seat nut 52
A check pressure reducing valve for a water heater, characterized in that a horizontal groove 52a is provided between the diaphragm retainer 51 and the diaphragm retainer 51, which communicates with the vertical hole 6d of the relief valve 53 when the secondary pressure rises.