CN201306481Y

CN201306481Y - Nuclear grade one large-caliber forged steel full-flow swing type check valve

Info

Publication number: CN201306481Y
Application number: CNU2008202189075U
Authority: CN
Inventors: 于传奇; 肖箭; 姜富世
Original assignee: DALIAN DV VALVE Co Ltd; Nuclear Power Qinshan Joint Venture Co Ltd
Current assignee: DALIAN DV VALVE Co Ltd; Nuclear Power Qinshan Joint Venture Co Ltd
Priority date: 2008-11-03
Filing date: 2008-11-03
Publication date: 2009-09-09
Anticipated expiration: 2018-11-03

Abstract

The utility model provides a nuclear grade one large-caliber forged steel full-flow swing type check valve which solves the problems that when medium flows through the valve, local resistance is increased and flow coefficient Cv value is low. A forging valve body and a valve cover are tightly fixed so as to form a central hole which is a machining offset inner cavity structure; a space is processed above a medium outfall of the inner cavity so as to lead a valve clack to be swung furthest till an end part platform of a rocker is contacted with the valve body; the swing angle of the valve clack can increase 72 degrees, i.e. full opening position; the valve clack is connected with the rocker in a spherical surface mode; the contacting edge position of the rocker and the valve clack is provided with a boss which is embedded into the valve clack with a certain gap so as to form an anti-rotating structure; the valve body of the offset inner cavity naturally form a rock seat mounting platform; the valve clack, the rocker, a shaft pin and a nut are assembled to a combined part which is fixed on the mounting platform of the valve body. As the offset inner cavity structure is adopted, the swing height of the valve clack reaches 72 degrees, i.e. full opening position so as to realize full flow and high Cv value which reaches 3278 by test.

Description

Nuclear one-level heavy caliber forged steel current global mechanism Swing check valve

Technical field

The utility model relates to Swing check valve, is specifically related to examine one-level heavy caliber forged steel current global mechanism Swing check valve.

Background technique

The high temperature high pressure large caliber Swing check valve uses in 1,000,000 grades of kilowatts of nuclear plant safety injected systems and reactor cooling system more.The like product that cast form is abroad arranged, the coefficient Cv value of DN250 is maximum 2900; It is 2700 that product (profile is a box-shaped) the Cv value of the non-high Cv of forging form is abroad arranged, adopt the forging form can improve body strength, but because the mach cavity shape of body cavity is unreasonable and inner cavity size is narrow, cause revolving that to open angle limited at medium power effect lower Disc, flow coefficient C v value is not high, and is maximum 2900.The said goods all is difficult to satisfy the high flow capacity Cv value requirement of large pressurized water reactor nuclear power plant system.

Summary of the invention

The purpose of this utility model is to provide nuclear one-level heavy caliber forged steel current global mechanism Swing check valve, solves flap and opens wide-angle, realizes the high Cv value of heavy caliber Swing check valve, current global mechanism.

For solving the problems of the technologies described above, the technical solution of the utility model is that nuclear one-level heavy caliber forged steel current global mechanism Swing check valve adopts forging blank form structure, mesopore is the biasing inner-cavity structure in the fastening formation mesopore of valve body and valve gap, valve body, and flap revolves and opens the angle increase.

Described biasing inner chamber processes a space above MEDIA FLOW outlet, flap can maximum be revolved open until the rocking arm end platform with till valve body contacts; The valve body of biasing inner chamber forms the rock shaft mountion plate naturally, flap, rocking arm, around pivot pin, rock shaft and nut assembled group component, and the usefulness bolt is on the mountion plate of valve body.

Described flap and rocking arm adopt the sphere form to be connected, to be provided with rotation prevention structure: the edge that rocking arm contacts with flap has in the boss embedding flap, between leave certain clearance.

The utility model is owing to adopt the biasing inner-cavity structure, and flap revolves to open and highly reaches 72 ° of fully open positions, realizes the high Cv value of heavy caliber Swing check valve, reaches 3278 through testing Cv, current global mechanism.

Description of drawings

Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.

Fig. 1 is a nuclear one-level heavy caliber forged steel current global mechanism Swing check valve structural representation;

Fig. 2 is to overlooking the rock shaft schematic representation by A;

Fig. 3 is a nuclear one-level heavy caliber forged steel current global mechanism Swing check valve flap rocking arm rotation prevention structure schematic representation.

Picture in picture mark explanation: valve body 1, valve seat 2, flap 3, Rocker arm 4, pad 5, nut 6, pivot pin 7, around pivot pin 8, rock shaft 9, taper pin 10, pad 11, nut 12, double-screw bolt 13, spirotallic gasket 14, valve gap 15, check washer 16, middle flange double-screw bolt 17, middle flange nut 18, rock shaft 19.

Embodiment

According to the design needs, researched and developed nuclear one-level heavy caliber forged steel current global mechanism Swing check valve.As shown in Figure 1, nuclear one-level heavy caliber forged steel current global mechanism Swing check valve body adopts and forges the blank form structure, and flange double-screw bolt 17 and middle flange nut 18 are fastening in valve body 1 and valve gap 15 usefulness, 14 sealings of therebetween one spirotallic gasket; Flap 3, Rocker arm 4, pad 5, nut 6, pivot pin 7,

rock shaft

9 and 19 combination backs are fixed on the valve body with double-screw bolt 13, nut 12, pad 11, with taper pin 10 location.

Because this valve is used for the containment vessel pipeline; Security to the operation of reactor has important effect; require very high to this valve performance; under the serious accident operating mode; must guarantee valve pressure border integrity; prevent that valve from leaking outside; protection environment and personal safety; therefore adopted middle flange spirotallic gasket 14 to add lip limit seal weld double sealing structure between valve body 1 and valve gap 15, flange zero leakage in the assurance makes sealability more reliable; be not subjected to temperature; humidity; the influence of external environments such as vibration; during reactor shutdown maintenance, seal weld allows to cut, and this welding part allows 3 times weldability.

Mesopore is the biasing inner-cavity structure in the valve body 1, and the whole machinings of inner chamber guarantee roughness; The biasing inner-cavity structure makes valve body 1 form the rock shaft mountion plate naturally, after flap 3, Rocker arm 4, pivot pin 7, rock shaft 2 and nut 6 form assembly parts, is fixed in bolt 13 on the mountion plate of valve body 1; Process a space above the MEDIA FLOW outlet of valve body 1 biasing inner chamber, flap 3 can maximum angles be revolved open, flap 3 revolves and opens angle and reach 72 ° of fully open positions, till making the rocking arm end platform and valve body contacting.Adopt the sphere form to connect, be provided with rotation prevention structure (as shown in Figure 3) between flap 3 and the Rocker arm 4; In Rocker arm 4 when casting, left certain clearance between them in the edge that contact with flap 3 casts out boss embedding flap 3, when flap 3 was closed, Rocker arm 4 can limit it and rotate freely but do not interfere its sealing on valve seat 2.

Flap 3 revolves to open around pivot pin 8 under the promotion of medium power and makes valve open, and flap 3 revolves to open and highly reaches 72 ° of fully open positions, can guarantee the peak rate of flow that MEDIA FLOW is out-of-date, and passage is without hindrance; Reach 3278 through test flow coefficient Cv value.The falling of flap 3 assembly parties contacts with valve seat 2 and makes valve closing when the medium reverse flow, plays the effect that stops medium back flow.

Claims

1, a kind of nuclear one-level heavy caliber forged steel current global mechanism Swing check valve, constitute by valve body, valve gap, valve seat, flap, rocking arm, pivot pin, rock shaft and nut etc., it is characterized in that: forge valve body and the fastening formation mesopore of valve gap, mesopore is a machining biasing inner-cavity structure in the valve body, and flap revolves and opens the angle increase.

2, according to the described nuclear one-level of claim 1 heavy caliber forged steel current global mechanism Swing check valve, it is characterized in that: described biasing inner chamber processes a space above MEDIA FLOW outlet, flap can maximum be revolved open until the rocking arm end platform with till valve body contacts.

3, according to claim 1 or 2 described nuclear one-level heavy caliber forged steel current global mechanism Swing check valves, it is characterized in that: the valve body of biasing inner chamber forms the rock shaft mountion plate naturally, flap, rocking arm, pivot pin, rock shaft and nut assembled group component use bolt on the mountion plate of valve body.

4, according to the described nuclear one-level of claim 1 heavy caliber forged steel current global mechanism Swing check valve, it is characterized in that: described flap adopts the sphere form to be connected with rocking arm.

5, according to the described nuclear one-level of claim 4 heavy caliber forged steel current global mechanism Swing check valve, it is characterized in that: the edge that described rocking arm contacts with flap has boss to embed in the flap, between leave certain clearance.

6, according to the described nuclear one-level of claim 1 heavy caliber forged steel current global mechanism Swing check valve, it is characterized in that: flap revolves to open highly and can reach 72 ° of fully open positions.