CN212055979U

CN212055979U - Pilot check valve

Info

Publication number: CN212055979U
Application number: CN202020507881.7U
Authority: CN
Inventors: 张清明
Original assignee: Kairuite Valve Co ltd
Current assignee: Kairuite Valve Group Co.,Ltd.
Priority date: 2020-04-09
Filing date: 2020-04-09
Publication date: 2020-12-01
Anticipated expiration: 2030-04-09

Abstract

The utility model discloses a guide's formula check valve, including valve body, valve clack and valve gap, its characterized in that: the valve clack is composed of a main valve clack and a guide valve clack, the upper part of the main valve clack is positioned in an inner hole of a valve sleeve, a main valve pressure chamber is formed in the inner hole of the valve sleeve, the upper end of the main valve clack is fixedly connected with a guide rod, the guide valve clack can be movably arranged on the guide rod up and down, the upper part of the guide valve clack is positioned in an inner hole of a sleeve, the sleeve is fixed at the bottom of a guide valve piston, the guide valve piston can be movably arranged in an inner hole of a valve cylinder up and down, a guide valve clack spring is arranged above the guide valve clack, an adjusting spring is arranged above the guide valve piston, the guide valve clack is provided with an upper seal. The utility model discloses can realize the no flow regulation and the safety and stability of valve clack, can be very close to set for under the pressure not leak and operate, still can set for opening pressure in the use.

Description

Pilot check valve

Technical Field

The utility model relates to an improved invention of a pilot check valve.

Background

Traditional guide's formula check valve comprises two parts, and one part is the check valve, and another part is the pilot valve, connects through external pipeline, and the shortcoming of existence is: external pipeline has the leakage point easily, and the medium needs to pass through the pipeline, has pressure loss, increases system instability, hardly carries out the no leakage operation under very close set pressure, can not set for opening pressure in the use.

Disclosure of Invention

The utility model aims at providing a can realize no flow regulation and the safety and stability of valve clack, can be very close to the no leakage of setting for under the pressure and operate, still can set for opening pressure's guide's formula check valve in the use.

The utility model adopts the technical proposal that:

pilot-operated type check valve, including valve body, valve clack and valve gap, the top of valve body is covered by the valve gap, and import and export are established to the both sides of valve body, by valve seat hole intercommunication, its characterized in that between import and the export: the valve clack is composed of a main valve clack and a guide valve clack, the main valve clack can be movably arranged above a valve seat hole up and down, the upper part of the main valve clack is positioned in a valve sleeve inner hole, the valve sleeve inner hole forms a main valve pressure chamber, the valve sleeve is tightly pressed and fixed by a valve cover, the upper end of the main valve clack is fixedly connected with a guide rod, the guide valve clack can be movably arranged on the guide rod up and down, the upper part of the guide valve clack is positioned in a sleeve inner hole, the sleeve is fixed at the bottom of a guide valve piston, the guide valve piston can be movably arranged in a valve cylinder inner hole up and down, a valve cylinder is fixed at the top of the valve cover, a guide valve clack spring is arranged above the guide valve clack, an adjusting spring is arranged above the guide valve piston, the guide valve clack is provided with, the center of the main valve flap is provided with a guide hole which is communicated with the inlet of the valve body and the inner hole of the sleeve. And the top of the valve cylinder is provided with an adjusting screw rod, and the lower end of the adjusting screw rod is abutted against an upper spring seat of the adjusting spring.

Compared with the traditional pilot check valve, the pilot check valve of the technical scheme integrates the check valve and the pilot valve, eliminates leakage points of an external pipeline, simultaneously, a medium does not need to pass through the pipeline during working and is directly carried out in the valve body, pressure loss is reduced, and system stability is improved, so that no-flow regulation and safety and stability of the valve clack are realized; furthermore, the adjusting spring can set the opening pressure during use, and is easy to adjust, so that the valve can be operated under the condition of being very close to the set pressure without leakage.

Drawings

The utility model discloses there is following figure:

figure 1 is a schematic structural diagram of the present invention,

fig. 2 is a partially enlarged view of fig. 1.

Detailed Description

As shown in the figure, the pilot check valve of the utility model comprises a valve body 1, a valve flap and a valve cover 4, the top of the valve body 1 is covered by the valve cover 4, the two sides of the valve body 1 are provided with an inlet A and an outlet B, the inlet A is communicated with the outlet B by a valve seat hole 2, the valve flap is composed of a main valve flap 3 and a pilot valve flap 7, the main valve flap 3 can be movably arranged above the valve seat hole 2 up and down, the upper part of the main valve flap 3 is arranged in an inner hole of a valve sleeve 6, the inner hole of the valve sleeve 6 forms a main valve pressure chamber D, the valve sleeve 6 is tightly pressed and fixed by the valve cover 4, the upper end of the main valve flap 3 is integrally connected with a guide rod 8, the pilot valve flap 7 can be movably arranged on the guide rod 8 up and down, the upper part of the pilot valve flap 7 is arranged in an inner hole of a sleeve 14, the sleeve 14 is integrally connected, an adjusting spring 11 is arranged above a pilot valve piston 12, an adjusting screw rod 9 is arranged at the top of a valve cylinder 5, the lower end of the adjusting screw rod 9 abuts against an upper spring seat 10 of the adjusting spring 11, a pilot valve flap 7 is provided with an upper seal 15 and a lower seal 16, the upper seal 15 is used for blocking the communication between a main valve pressure chamber D and a sleeve inner hole C, the lower seal 16 is used for blocking the communication between an exhaust hole 17 and the main valve pressure chamber D, the exhaust hole 17 is positioned at the upper part of the main valve flap 3, the exhaust hole 17 is communicated with the main valve pressure chamber D and a valve body outlet B, a guide hole 18 is arranged in the center of the main valve flap 3, and the.

The utility model discloses a work like this: when the system pressure is lower than the set valve pressure, the medium pressure enters the main valve pressure chamber through the guide hole, the sleeve inner hole and the guide valve clack, acts on the main valve clack to generate downward force and close the main valve; when the system pressure is increased to be close to the set pressure, the medium pressure pushes the pilot valve piston to rise through the guide hole, the upper seal of the pilot valve flap is closed, and the lower seal of the pilot valve flap is still closed at the moment; the system pressure is slightly increased, the lower part of the pilot valve flap is sealed and slightly opened, and the pressure in the main valve pressure chamber is discharged through an exhaust hole on the main valve flap; when the system pressure reaches or is slightly higher than the set pressure, the lower seal of the pilot valve flap is opened, overpressure is discharged, the pilot valve piston tends to descend, and the feedback action can enable the main valve flap to float at a certain position to achieve the regulation action; when the system pressure is over-pressure, the main valve flap is fully opened; when the system pressure is reduced to below the set pressure, the lower seal of the pilot valve flap is closed, when the system pressure is further reduced to the recoil pressure, the upper seal of the pilot valve flap is opened, the pressure of the main valve pressure chamber is recovered, and the main valve flap is closed.

Claims

1. Pilot-operated type check valve, including valve body, valve clack and valve gap, the top of valve body is covered by the valve gap, and import and export are established to the both sides of valve body, by valve seat hole intercommunication, its characterized in that between import and the export: the valve clack is composed of a main valve clack and a guide valve clack, the main valve clack can be movably arranged above a valve seat hole up and down, the upper part of the main valve clack is positioned in a valve sleeve inner hole, the valve sleeve inner hole forms a main valve pressure chamber, the valve sleeve is tightly pressed and fixed by a valve cover, the upper end of the main valve clack is fixedly connected with a guide rod, the guide valve clack can be movably arranged on the guide rod up and down, the upper part of the guide valve clack is positioned in a sleeve inner hole, the sleeve is fixed at the bottom of a guide valve piston, the guide valve piston can be movably arranged in a valve cylinder inner hole up and down, a valve cylinder is fixed at the top of the valve cover, a guide valve clack spring is arranged above the guide valve clack, an adjusting spring is arranged above the guide valve piston, the guide valve clack is provided with, the center of the main valve flap is provided with a guide hole which is communicated with the inlet of the valve body and the inner hole of the sleeve.

2. The piloted check valve as in claim 1, wherein: and the top of the valve cylinder is provided with an adjusting screw rod, and the lower end of the adjusting screw rod is abutted against an upper spring seat of the adjusting spring.