CN2300776Y

CN2300776Y - Floating piston pressure-reducing type showing valve

Info

Publication number: CN2300776Y
Application number: CN 97216552
Authority: CN
Inventors: 刘旭民
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-05-13
Filing date: 1997-05-13
Publication date: 1998-12-16
Anticipated expiration: 2007-05-13

Abstract

The utility model relates to a valve, particularly an improved showing valve used in a fire-extinguishing system. A bended side part which is adjacent to a water inlet on the upper part of a valve body and an end opening that corresponds to a water outlet are provided with a tank body with a water outlet. The both ends of a piston component in the tank body are a valve used for fixing and sealing a washer and a piston body used for the movable fit respectively. The utility model has the advantages that the piston structure is so simple that no sealing device is arranged on the piston, the piston motion resistance is small so that the action speed is fast, and the utility model does not need to add a reset spring because the valve can close automatically through the water flow resistance in the occasion of resetting.

Description

Suspended piston decompression type drench valve

The utility model relates to a kind of valve, specifically is used for the improvement of suppression system drench valve.

Drench valve is one of critical component of water spray fire extinguish system, opens during fire, supplies water to waterfog head.Three types of Lever types, diaphragm type, piston type drench valve are arranged at present both at home and abroad.The cold formula drench valve of living only has pressure type at present both at home and abroad, be that piston is divided into left and right sides two-part with piston cavity, seal by rubber band between two-part, piston two chambeies all do not have water at ordinary times, open the chamber water-filling of control electromagnetic valve during fire to piston, this cavity pressure increases, and the pressure difference in dependence piston two chambeies overcomes spring force and opens valve.Resetting of piston then relies on spring force.There are two major defects in this drench valve: 1) piston two chambeies sealing difficulty, solve sealing problem, need to add stuffing box gland on piston, the employing of stuffing box gland makes the piston motion resistance big, rely on spring reset, cause the piston structure complexity, unlatching and unit time are longer, and valve opening time was 15 seconds usually, and the time of closing was 60 seconds, the long fire extinguishing response time that can increase water spray fire extinguish system of opening time, incur loss through delay fire extinguishing opportunity.2) can't implement remote manual control to valve, drench valve usually is installed in the conflagration area, after fire takes place, influenced by big fire and can not normally open, and the people also can't implement manually drench valve near the fire district.

The purpose of this utility model is the shortcoming at above-mentioned existence, designs a kind of simple in structurely, and opening speed is fast, the piston type drench valve of good sealing effect.

Technological points of the present utility model is: valve body (1) top water intake (7) is adjacent curved to be provided with the cylinder body (6) of taking water hole (7) out of to sidepiece and the corresponding port of water outlet (9), and the piston assembly two ends in the cylinder body (6) are respectively the valve (5C) and the piston only movingly (5a) of fixing seal packing ring.Be connected by flange between the cylinder body (6) that the corresponding port of valve body (1) sidepiece water outlet (9) is provided with and valve body (1); The water outlet place is provided with seal ring (2) in valve body (1); Valve at piston assembly two ends (5C) and piston only (5a) are to join by connecting rod (5b).

This drench valve structurally has two distinguishing features: 1) do not need sealing between piston two chambeies, do not have stuffing box gland on the piston.2) piston two chambeies all are full of water at ordinary times, and promptly piston is suspended in the water.Have following advantage: 1) piston structure is simple, does not have seal arrangement on the piston; 2) the piston motion resistance is little, thereby quick action, and the opening time, the shut-in time was less than 20 seconds less than 2 seconds; 3) rely on during valve reset resistance to water-flow to close automatically, need not to add Returnning spring; 4) can implement remote manual control; 5) piston two chambeies have water to exist at ordinary times all the time, have reduced the possibility of piston corrosion.

Accompanying drawing is an opening state structural representation of the present utility model.

Its working principle is: under the no fire normal condition, piston is in closed position, and valve relies on the import water pressure to be pressed on the valve base, keeps the sealing of valve.Handle solenoid valve during fire and open, A chamber water is flowed out, hydraulic pressure descends, by the piston clearance to the water flow in A chamber seldom by the B chamber, therefore be not enough to influence the hydraulic pressure in A chamber, the effect lower piston in B, A two cavity pressure differences moves, and drives the valve Open valve of lifting off a seat.Fire extinguishing back closing control solenoid valve, A chamber water stops to flow out, and flows into the A chamber to the moisturizing of A chamber by piston clearance water by the B chamber.Valve drives valve in the enable possition by resistance to water-flow and moves to closing direction, until throttle down.

Claims

1. suspended piston decompression type drench valve, have valve body and entery and delivery port, it is characterized in that valve body (1) top water intake (8) is adjacent curved is provided with the cylinder body (6) of taking water hole (7) out of to sidepiece and the corresponding port of water outlet (9), and the piston assembly two ends in the cylinder body (6) are respectively the valve (5C) and the piston only movingly (5a) of fixing seal packing ring.

2. according to the described suspended piston decompression type of claim 1 drench valve, it is characterized in that being connected by flange between cylinder body (6) that the corresponding port of valve body (1) sidepiece water outlet (9) is provided with and valve body (1); The water outlet place is provided with seal ring (2) in valve body (1); Valve at piston assembly two ends (5C) and piston only (5a) are to join by connecting rod (5b).