CN2237759Y

CN2237759Y - Monodirectional piston valve

Info

Publication number: CN2237759Y
Application number: CN 95241869
Authority: CN
Inventors: 陈志坚
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-07-13
Filing date: 1995-07-13
Publication date: 1996-10-16
Anticipated expiration: 2005-07-13

Abstract

The utility model discloses a monodirectional piston valve, comprising a valve body, a piston rod, an upper sealing ring, a lower sealing ring and a handle. The valve body is provided with a water inlet and a water outlet, and the inner cavity of the valve body is spit into an upper and a lower segments. The upper segment is a column-shaped inner cavity with equal upper and lower inside diameters, and the lower segment is a horn-shaped inner cavity with a big upper part and a small lower part. The inner diameter of the upper end of the horn-shaped inner cavity and the inner diameter of the column-shaped inner cavity are equal, and the inner diameter of the lower end and the inner diameter of the water outlet are equal. The diameter of the upper segment of the piston rod is little smaller than the diameter of the column-shaped inner cavity, and the diameter of the lower segment is little smaller than the diameter of the outlet port. The upper segment is provided with the upper sealing ring and closed with the surface of the column-shaped inner cavity, which obstruct the upper part and the water inlet. The lower segment is provided with the lower sealing ring and closed with the water outlet, and the water outlet can be opened and closed. The utility model has the advantages of simple structure and long service life.

Description

A kind of single acting piston formula valve

The utility model belongs to valve technology field.

Valve commonly used comprises valve body, seal ring, handle and screw rod, promotes the seal ring circulation road of closing or fetch boiling water with screw rod.In order to prevent leaking under the closed condition, screw rod must be tightened, seal ring is pressed on the valve body, the long-term use, seal ring and screw rod all damage easily, shorten the life-span of valve, also the effect of influence joint liquid medicine resource.

The purpose of this utility model is to provide the single acting piston formula valve of the employing piston switch flow channel of growing a kind of working life.

The utility model comprises valve body, handle, piston rod and upper and lower seal ring.The body cavity hypomere is up big and down small tubaeform cavity.When piston rod was displaced downwardly to bottom dead center position, the lower seal on the piston-rod lower end was just blocked the lower end of tubaeform inner chamber, and effect of water pressure is stopped up the end opening of tubaeform inner chamber fully on lower seal, current are closed.To move on the piston rod, the seal ring on the piston-rod lower end enters the bigger part of internal diameter of tubaeform inner chamber, and current promptly flow out through the space between lower seal and the tubaeform inner chamber.Change the position of piston rod, promptly can regulate flows out the size of current.

Fig. 1 is a structural drawing of the present utility model.Wherein, 1 is valve body, and 2 is cylindrical inner chamber, and 3 is tubaeform inner chamber, and 4 is piston rod, and 5 is last seal ring, and 6 is lower seal, and 7 is handle, and 8 is water intake, and 9 is water outlet, and 10 is top dead center, and 11 is lower dead center.Below in conjunction with Fig. 1 the utility model is further described.Water intake 8 and water outlet 9 are arranged on the valve body 1.The inner chamber of valve body 1 is divided into two sections, epimere is the cylindrical inner chamber 2 that upper and lower internal diameter equates, hypomere is the up big and down small tubaeform inner chamber 3 of internal diameter, the upper end of tubaeform inner chamber 3 is a top dead center 10, this place's internal diameter equates with the internal diameter of cylindrical inner chamber 2, the lower end is a lower dead center 11, and this place's internal diameter equates with the internal diameter of water outlet 9.Piston rod is divided into two sections, and the diameter of epimere is slightly less than the internal diameter of cylindrical inner chamber 2, and the diameter of hypomere is slightly less than the internal diameter of water outlet 9.Seal ring 5 is housed on the epimere of piston rod, after loading onto, the internal surface driving fit of last seal ring 5 and cylindrical inner chamber 2, cut off water intake 8 and the intracavity space of last seal ring 5 with top, water can not be let out by last seal ring 5, when piston rod moved up and down, lower seal 6 can be moved between top dead center 10 and lower dead center 11.When lower seal 6 was loaded onto in piston rod 4 lower ends, its external diameter was slightly larger than water outlet 9 internal diameters, so when lower seal 6 was positioned at lower dead center 11, hydraulic action blocked water outlet 9 on lower seal 6 fully, thereby closed current; When driving lower seal 6, piston rod 4 leaves when moving in the tubaeform inner chamber 3 on the lower dead center 11, at this moment, the internal diameter of tubaeform inner chamber 3 is greater than the internal diameter of lower seal 6, current just can move on water outlet 9 flows out as continues lower seal 6 through the space between lower seal 6 and the tubaeform inner chamber 3, then current are big more, during to top dead center 10, the current maximum.Piston rod 4 is enclosed within the chamber of valve body 1, can make expedite straight line motion; Also can make screw thread and with this screw thread combination at the epimere of the epimere of piston rod 4 and valve body 1 inner chamber, piston rod 4 can be while rotating moving linearly.Handle 7 is installed on top at piston rod 4, in order to promote piston rod 4 motions.Valve body 1 and piston rod 4, handle 7 can be made with metallic material, also can be made of plastic.Last seal ring 5 and lower seal 6 can be made with rubber, can be made of plastic.

The utility model has the advantages that simple in structure, low cost of manufacture, long service life.

Claims

1. a single acting piston formula valve is characterized in that comprising valve body (1), piston rod (4), goes up seal ring (5), lower seal (6), handle (7); Water intake (8) and water outlet (9) are arranged on the valve body (1), the inner chamber of valve body (1) is divided into upper and lower two sections, epimere is the cylindrical inner chamber (2) that upper and lower internal diameter equates, hypomere is the up big and down small tubaeform inner chamber (3) of internal diameter, the upper end of tubaeform inner chamber (3) is top dead center (10), this place's internal diameter equates that with the internal diameter of cylindrical inner chamber (2) lower end is lower dead center (11), and this place's internal diameter equates with the internal diameter of water outlet (9); Piston rod (4) is divided into two sections, and the diameter of epimere is slightly less than cylindrical inner chamber (2) internal diameter, and the hypomere diameter is slightly less than water outlet (9) internal diameter; Piston rod (4) is contained in the inner chamber of valve body (1), can unhinderedly move up and down, seal ring (5) is housed, after loading onto on its epimere, the internal surface driving fit of last seal ring (5) and cylindrical inner chamber (2) cuts off water intake (8) and the intracavity space of last seal ring (5) with top; Lower seal (6) is equipped with in the lower end of piston rod (4), its external diameter is slightly larger than water outlet (9) internal diameter, when lower seal (6) is positioned at lower dead center (11) when locating, hydraulic action can block water outlet (9) sealing on lower seal (6), and lower seal (6) can move up and down between lower dead center (11) and top dead center (10); Handle (7) is contained in piston rod (4) top.

2. according to the described single acting piston formula of claim 1 valve, it is characterized in that valve body (1), piston rod (4), handle (7) made by metallic material.

3. according to the described single acting piston formula of claim 1 valve, it is characterized in that valve body (1), piston rod (4), handle (7) are made of plastics.

4. according to the described single acting piston formula of claim 1 valve, it is characterized in that seal ring (5), lower seal (6) made by rubber.

5. according to the described single acting piston formula of claim 1 valve, it is characterized in that seal ring (5), lower seal (6) are made of plastics.