JPH07234725A - Noise suppression-type reducing valve - Google Patents

Abstract

PURPOSE:To damping effect, to prevent micro vibration and to suppress the occurrence of noise by adding resistance by means of the sliding of an 0-ring in addition to the spring force of a pilot spring when a pilot piston moves. CONSTITUTION:A pressure equalizing hole 17 and a micro hole 18 are piercingly provided for the pilot piston 4 provided in a body 1, and the O-ring 16 is provided on a surface which is brought into contact with the body 1. A dash pot 19 adjusting a position is provided on the pilot spring room 3-side of the pilot piston 4. The pilot spring 2 is provided between the pilot piston 4 and the dash pot 19. When the pilot piston 4 moves, resistance by the sliding of the O-ring 16 is added in addition to the spring force of the pilot spring 2 so as to give damping effect. Thus, micro vibration is absorbed and the occurrence of noise can be suppressed.

Description

Detailed Description of the Invention

[0001]

[Industrial application] In a submersible model, the pressure reducing valve is usually located underwater, so even if noise is generated, the pressure setting of the pressure reducing valve can be adjusted or other valves can be adjusted to eliminate the noise. I can't. On the other hand, in ships and general industrial machines in which the pressure reducing valve is placed in the atmosphere, it is possible to easily adjust it, and at present, no measures have been taken, but it can also be used in this field.

[0002]

2. Description of the Related Art FIG. 2 shows a prior art balance piston type pressure reducing valve. 01 is the body of the pressure reducing valve, 02 is the pilot spring, 03 is the pilot spring chamber, 0
4 is a pilot piston attached to the tip of the pilot spring 02, 05 is a seat of the pilot 04 provided on the body 01, 06 is the pilot spring 0
2 is an adjusting screw, 07 is a drain port formed in the body 01, 08 is a spring, 09 is a spring chamber, 0
Reference numeral 10 is a main piston, 011 is a main flow path, 012 is a fluid inlet, 013 is a fluid outlet, 014 is a fluid bypass, and 015 is an orifice provided on the main piston 010.

In FIG. 2, a drain port 07 is provided in the pilot spring chamber 02 in the body 01 of the pressure reducing valve in order to stabilize the pressure reducing pressure control, and the flow rate thereof is usually 0.8 to
It is 1.0 l / min.

The fluid outlet 013 is connected to an actuator (not shown), and when the pressure in the outlet side circuit is equal to or lower than the set pressure, each of the fluid inlet 012, the outlet 013, the spring chamber 09, and the fluid bypass 014. The pressure is equal.

When the circuit pressure exceeds the set pressure of the pressure reducing valve, the pilot piston 04 separates from the seat 05, oil flows through the drain port 07, and the main piston 01
The spring chamber 0
A pressure drop of 8 occurs, and due to this pressure drop, the upper and lower pressure balance of the main piston 010 collapses, and due to this differential pressure, the main piston 010 rises out of the force of the spring 09, and the main flow path 011 of the oil flows. The passage to outlet 013 is throttled to control the pressure.

[0006]

In the conventional pressure reducing valve as described above, the natural frequency of this portion is determined by the spring constant of the pilot spring 02 and the masses of the pilot piston 04 and the pilot spring 02. When the pilot piston 04 is open, noise is generated from the pilot piston 04 when resonance occurs with the actuator, the opening of the main piston 010 is small in the stopped state of the actuator or in the initial stage of activation.

On the other hand, by providing an O-ring and a dash pot on the pilot piston of the pressure reducing valve, a damping effect is given to the movement of the pilot piston to prevent a minute vibration, and a stable operation is performed to suppress the generation of noise. It is what

[0008]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and in a balance piston type pressure reducing valve, a pilot piston having an O-ring is provided with a pressure equalizing hole and a minute opening, and A noise suppression type pressure reducing valve in which a dash pot whose position can be adjusted is provided on the pilot spring chamber side to provide a damping effect to the movement of the pilot piston and suppress the generation of noise from the pilot piston portion.

That is, an O-ring is provided on the pilot piston that is pressed against the seat by the pilot spring of the pressure reducing valve, and a dash pot is provided on the pilot spring chamber side of the pilot piston to provide a damping effect to the movement of the pilot piston and to open the main piston. This is to suppress the generation of noise when the degree is low.

[0010]

In the pressure reducing valve of the present invention, by providing the pilot piston with an O-ring, when the pilot piston moves, in addition to the spring force of the pilot spring, resistance due to sliding of the O-ring is added to provide a damping effect. Prevents minute vibrations and suppresses noise generation. Furthermore, by providing a dash pot on the pilot piston,
The damping effect of the fluid is also added.

[0011]

FIG. 1 shows an embodiment of the present invention. 1 is a body of the pressure reducing valve, 2 is a pilot spring, 3 is a pilot spring chamber, 4 is a pilot piston pushed by the pilot spring 2, 5 is a seat of the pilot 4 provided on the body 1, and 6 is a pilot spring 2. Adjusting screw to adjust, 7 is a drain port on the body 1,
8 is a spring, 9 is a spring chamber, 10 is a main piston, 11 is a main flow path, 12 is a main fluid inlet, 1
3 is an outlet of the main fluid, 14 is a fluid bypass, and 15 is an orifice provided in the main piston 10. 1
6 is an O-ring attached to the pilot piston 4,
Reference numerals 17 and 18 respectively denote a pressure equalizing hole and a minute opening formed in the pilot piston 4, and 19 denotes a dash pot provided on the pilot spring chamber side of the pilot piston 4.

That is, the pilot piston 4 provided in the body 1 is provided with a pressure equalizing hole 17 and a minute opening 18, and an O-ring 16 is provided on the surface in contact with the body 1. A dash pot 19 whose position can be adjusted is provided on the pilot spring 4 side of the pilot piston 4, and the pilot spring 2 is set between the pilot piston 4 and the dash pot 19. Other structures and operations are the same as those of the conventional FIG.

[0013]

As described above, according to the balance piston type pressure reducing valve of the present invention, when the pilot piston moves, the sliding force of the O-ring becomes a resistance in addition to the spring force of the pilot spring, and the damping effect is produced. Absorbs minute vibrations and suppresses noise generation.

Furthermore, a dash pot is provided in the pilot piston portion, and a pressure equalizing hole and a minute opening are provided in the pilot piston to add a damping effect by the fluid to the movement of the pilot piston to suppress noise generation.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a noise suppressing pressure reducing valve according to an embodiment of the present invention.

FIG. 2 is a sectional view showing a conventional pressure reducing valve.

[Explanation of symbols]

 1 Body 2 Pilot Spring 3 Pilot Spring Chamber 4 Pilot Piston 5 Seat 6 Adjusting Screw 7 Drain Port 8 Spring 9 Spring Chamber 10 Main Piston 11 Main Flow Path 12 Fluid Inlet 13 Fluid Outlet 14 Bypass 15 Main Piston 16 O-ring 17 Uniform Pressure hole 18 Micro opening 19 Dash pot

Claims (1)

[Claims] 1. A balance piston type pressure reducing valve, wherein a pilot piston having an O-ring is provided with a pressure equalizing hole and a minute opening, and a dash pot for adjusting the position is provided on the pilot spring chamber side of the pilot piston. A noise suppression type pressure reducing valve characterized by suppressing the generation of noise from the pilot piston part by giving a damping effect to the movement of the piston.