CN207486146U - Safety cut-off valve and its control system - Google Patents

Abstract

A kind of safety cut-off valve and its control system, including：Handwheel, valve body, stent, valve rod, cylinder pressure, cylinder, solenoid valve, orifice flowmeter, first passage and second channel are provided on the valve body, the valve rod uses lift, drives above-mentioned flap for linear motion along the center line of fluid, realizes the cut-off to medium, shorten valve opening and closing stroke, when pipeline flow is much, when valve receives the flow exceeded pulse output signals of orifice flowmeter, electromagnetism valve events, gas circuit unicom, valve rapid-closing；When line pressure drastically increases, medium enters cylinder pressure, and valve is automatically cut off, and to protect front and rear miscellaneous equipment, therefore is widely used on natural gas line, and security performance is high, effect is good.

Description

Safety cut-off valve and its control system

Technical field

The utility model is related to a kind of self-operated safety stop valve, especially with regard to one kind in super flow, superpressure Protect the quick action emergency valve and its control system of pipeline safety.

Background technology

The effect of safety cut-off valve is when abnormal emergency occurs in system pipeline, and rapid-closure damper cuts off pipeline, Protection system and equipment safety.

The Chinese patent of application number 200920170968.3 discloses a kind of safety cut-off valve, mainly has housing, air inlet, goes out Gas port, cut-out chamber, de- mouth mechanism, stop valve, cut-out spring, cut-out valve rod, piston, pressure spring, connecting rod, feedback signal pipe etc. It forms.This kind of stop valve mainly has off-line feature to bear stop valve and cuts off the downward of spring in opening, reset operation Pulling force, when feedback pressure is more than cut-out setting value, promotion connecting rod drives tripping mechanism, is detached from cut-out valve rod, in cut-out spring work With lower cut-out valve port.The closing element of the patent uses O-ring mode, is sealed with valve port inclined-plane, to valve closing element and valve port Inclined-plane cooperation it is more demanding, manufacture difficulty is big, while the keying of valve is both needed to manually, inconvenient.

Application No. is 200920257243.8 pneumatic rapid cut-off valves, including reversal valve, cylinder and shut-off valve, work as pipeline When there is abnormal emergency, the movement of piston in cylinder is controlled by reversal valve, shut-off valve is made quickly to cut off, protection system and set Standby safety.The drawback is that needing external gas source, valve composition is complicated, takes up a large area.

The safety cut-off valve used at present has the following problems：(1) operation of hand off valve is time-consuming and laborious, in certain feelings Under condition may at all cannot be close, hand off valve can not be closed in time, and the cutoff action of electronic stop valve is by the external energy Influence, safety is poor.(2) pneumatic cut-off valve needs external gas source, and valve mechanism is complicated, takes up a large area.

Invention content

The purpose of this utility model is that solving the deficiencies in the prior art, the utility model provides one kind without external gas Source in super flow, over pressure in emergency circumstances, emergency cut-off, reliably protecting system and equipment is realized using medium pressure itself The self-operated safety stop valve of safety.

Technical solution is used by the utility model solves its technical problem：A kind of safety cut-off valve, including stop valve Ontology, the cut-out valve body are made of valve body, valve seat, valve deck, and the valve body is equipped with first passage, second channel, described It being equipped with stent, cylinder, handwheel on valve deck successively from the bottom to top, valve rod is equipped in the valve seat, the valve rod is lifting structure, The lower end of the valve rod is equipped with for the flap that blocks first passage, second channel, the upper end of the valve rod sequentially pass through valve deck, Stent, cylinder are connected with handwheel, and gland is equipped between the stent and valve deck, and pressure is equipped between the stent and valve rod Cylinder, the cylinder pressure is interior to be equipped with the piston being fixed on valve rod, and the piston being fixed on valve rod is equipped in the cylinder.

Preferably, the flap is plunger type structure, and sealing surface is pyramidal structure.

Preferably, being equipped with folding handle on the upside of the handwheel, the folding handle is equipped with instruction and covers, the instruction cover It is interior to be equipped with indicator.

Preferably, the both sides up and down of the cylinder are respectively equipped with cylinder upper flange, cylinder lower flange, the cylinder passes through Cylinder lower flange is connected with stent.

The utility model additionally provides a kind of control system of safety cut-off valve, including cutting off valve body, further includes orifice plate Flowmeter, pressure transmitter, solenoid valve, hydraulic cylinder, overflow valve, hydraulic control one-way valve, the orifice flowmeter, pressure inverting After device, hydraulic cylinder, overflow valve are set to the valve of cut-out valve body, the hydraulic control one-way valve is set to the valve of cut-out valve body Before, the hydraulic cylinder is connected with overflow valve, and the overflow valve, hydraulic control one-way valve are connected with cutting off the cylinder pressure of valve body, The solenoid valve be set to cut-out valve body cylinder on and with the front and rear sides unicom of the piston in cylinder, the electricity Field control end is connected on magnet valve, remote control terminal, the remote control terminal and orifice plate are connected on the field control end Flowmeter, pressure transmitter are connected.

The beneficial effects of the utility model are：The cut-out of two-way gas circuit is set, while realizes that overload and pressure are more than limit It is automatically cut off during constant-pressure, high safety and reliability；Make flap for linear motion along the center line of fluid using lift valve rod, contract The keying stroke of short valve realizes quick cut-out in emergency circumstances；The opening and closing element of self-operated safety stop valve is using stopper Flap, sealing surface is tapered, have MULTIPLE COMPOSITE sealing structure, ensure the good sealing performance of valve；Using itself medium Pressure, discharge characteristic realize safety cut-off, and without external gas source, valve mechanism is simple, and floor space is small, easy to operate.

Description of the drawings

Fig. 1 is the structure diagram of the utility model embodiment；

Fig. 2 is the control principle drawing of the utility model embodiment.

Specific embodiment

Below by specific embodiment, and with reference to attached drawing, the technical solution of the utility model is made further specifically It is bright.

Embodiment：

A kind of safety cut-off valve as shown in Figure 1, including cutting off valve body 25, the cut-out valve body 25 by valve body 17, Valve seat 14, valve deck 11 form, and the valve body 17 is equipped with first passage 15, second channel 16, on the valve deck 11 from the bottom to top It is equipped with stent 9, cylinder 6, handwheel 1 successively, is equipped with valve rod 5 in the valve seat 14, the valve rod 5 is lifting structure, the valve The lower end of bar 5 is equipped with the flap 12 for blocking first passage 15, second channel 16, and the flap 12 is plunger type structure, and close Cover is pyramidal structure；The upper end of the valve rod 5 sequentially passes through valve deck 11, stent 9, cylinder 6 and is connected with handwheel 1, the hand 1 upside of wheel is equipped with folding handle 4, and the folding handle 4 is equipped with instruction cover 2, indicator 3 is equipped in the instruction cover 2；Institute It states and gland 10 is equipped between stent 9 and valve deck 11, cylinder pressure 18, the cylinder pressure 18 are equipped between the stent 9 and valve rod 5 It is interior to be equipped with the piston 13 being fixed on valve rod 5, it is equipped with the piston 19 being fixed on valve rod 5, the gas in the cylinder 6 The both sides up and down of cylinder 6 are respectively equipped with cylinder upper flange 7, cylinder lower flange 8, and the cylinder 6 passes through cylinder lower flange 7 and stent 9 It is connected.

As shown in Fig. 2, the utility model additionally provides a kind of control system of safety cut-off valve, including cutting off valve body 25, orifice flowmeter 20, pressure transmitter 22, solenoid valve 24, hydraulic cylinder 26, overflow valve 27, hydraulic control one-way valve 28 are further included, After the orifice flowmeter 20, pressure transmitter 22, hydraulic cylinder 26, overflow valve 27 are set to the valve of cut-out valve body 25, institute It states before hydraulic control one-way valve 28 is set to the valve of cut-out valve body 25, the hydraulic cylinder 26 is connected with overflow valve 27, described excessive Stream valve 27, hydraulic control one-way valve 28 are connected with cutting off the cylinder pressure 18 of valve body 25, and the solenoid valve 24 is set to cut-out valve body On 25 cylinder 6 and with the front and rear sides unicom of the piston 19 in cylinder 6, be connected with live control on the solenoid valve 24 End 23 processed, is connected with remote control terminal 21 on the field control end 23, the remote control terminal 21 and orifice flowmeter 20, Pressure transmitter 22 is connected.

It is suitable when using to reach the manual or pneumatic mode that selects by can be manually rotated the folding handle 4 of 1 top of handwheel Hour hands rotate, and folding handle 4 is selection manual opening-closing cut-out valve body 25 in place, is arrived when using rotating folding handle 4 counterclockwise Position is selection closed pneumatic cut-out valve body 25, and folding handle 4 is in counterclockwise state in place, and cut-out valve body 25 is in gas Dynamic driving condition.

When pipeline flow is excessive, more than limit value when, the flow that remote control terminal 21 receives orifice plate stream flowmeter 20 is exceeded Pulse output signals, solenoid valve 24 act, and cut-out 25 quick closedown of valve body is realized in gas circuit connection；When line pressure drastically on Rise, more than limit value when, medium enters cylinder pressure 18, and medium pressure itself band ovable valve stem 5, valve rod 5 drives flap 12 to make straight line fortune Dynamic, rapid connection between cut-out first passage 15 and second channel 16 downwards realizes the cut-out to medium, ensures system peace Entirely.

Cutting off valve body 25 has position indicating function, is provided with field control end 23 and remote control terminal 21, can be to cutting The opening degree of disconnected valve body 25 is controlled, in the position for having field control end 23 and remote control terminal 21 to can detect valve State is to realize that remote command and original place operate.

It after valve completes a switching motion, needs to carry out hand-reset to valve, valve could work normally, and operation is overflow Stream valve 27 is vented hydraulically-controlled one-way valve 28, waits for 1 minute or so, completes emptying action；Hydraulically-controlled one-way valve 28 is operated to pressure Cylinder 18 carries out pressure-emptying (must not pay attention to by drain towards people), waits for 1 minute or so, completes emptying and acts；Control solenoid valve 24 reach horizontal position；Folding handle 4 is rotated counterclockwise into position, is operated manually.Rotation hand wheel 1 opens valve It opens；Solenoid valve 23, hydraulically-controlled one-way valve 28, overflow valve 27 is controlled to reset again, finally by folding handle 4 rotate clockwise in place, into Enter pneumatic operation state.

The beneficial effects of the utility model are：The cut-out of two-way gas circuit is set, while realizes that overload and pressure are more than limit It is automatically cut off during constant-pressure, high safety and reliability；The center line for making flap 12 along fluid using lift valve rod 5 makees straight line fortune It is dynamic, shorten the keying stroke of valve, realize quick cut-out in emergency circumstances；The opening and closing element of self-operated safety stop valve is to use The flap 12 of stopper, sealing surface is tapered, has MULTIPLE COMPOSITE sealing structure, ensures the good sealing performance of valve；Using certainly Body pressure medium, discharge characteristic realize safety cut-off, and without external gas source, valve mechanism is simple, and floor space is small, operation side Just.

Embodiment described above is a kind of preferable scheme of the utility model, not the utility model is made any Formal limitation also has other variants and remodeling under the premise of without departing from the technical solution recorded in claim.

Claims (5)

1. a kind of safety cut-off valve, including cutting off valve body（25）, the cut-out valve body（25）By valve body（17）, valve seat （14）, valve deck（11）Composition, the valve body（17）It is equipped with first passage（15）, second channel（16）, it is characterised in that：It is described Valve deck（11）On from the bottom to top successively be equipped with stent（9）, cylinder（6）, handwheel（1）, the valve seat（14）It is interior to be equipped with valve rod（5）, The valve rod（5）For lifting structure, the valve rod（5）Lower end be equipped with for blocking first passage（15）, second channel （16）Flap（12）, the valve rod（5）Upper end sequentially pass through valve deck（11）, stent（9）, cylinder（6）With handwheel（1）It is connected It connects, the stent（9）With valve deck（11）Between be equipped with gland（10）, the stent（9）With valve rod（5）Between be equipped with cylinder pressure （18）, the cylinder pressure（18）Interior be equipped with is fixed on valve rod（5）On piston（13）, the cylinder（6）Interior be equipped with is fixed on valve rod （5）On piston（19）.

2. safety cut-off valve according to claim 1, it is characterised in that：The flap（12）For plunger type structure, and seal Face is pyramidal structure.

3. safety cut-off valve according to claim 1, it is characterised in that：The handwheel（1）Upside is equipped with folding handle （4）, the folding handle（4）It is equipped with instruction cover（2）, the instruction cover（2）It is interior to be equipped with indicator（3）.

4. safety cut-off valve according to claim 1, it is characterised in that：The cylinder（6）Both sides up and down be respectively equipped with Cylinder upper flange（7）, cylinder lower flange（8）, the cylinder（6）Pass through cylinder lower flange（8）With stent（9）It is connected.

5. the control system of safety cut-off valve as claimed in any of claims 1 to 4, it is characterised in that：Including cutting Disconnected valve body（25）, further include orifice flowmeter（20）, pressure transmitter（22）, solenoid valve（24）, hydraulic cylinder（26）, overflow Valve（27）, hydraulic control one-way valve（28）, the orifice flowmeter（20）, pressure transmitter（22）, hydraulic cylinder（26）, overflow valve （27）It is set to cut-out valve body（25）Valve after, the hydraulic control one-way valve（28）It is set to cut-out valve body（25）Valve before, The hydraulic cylinder（26）With overflow valve（27）It is connected, the overflow valve（27）, hydraulic control one-way valve（28）With cutting off valve body （25）Cylinder pressure（18）It is connected, the solenoid valve（24）It is set to cut-out valve body（25）Cylinder（6）Upper and and cylinder（6） Interior piston（19）Front and rear sides unicom, the solenoid valve（24）On be connected with field control end（23）, it is described existing Field control terminal（23）On be connected with remote control terminal（21）, the remote control terminal（21）With orifice flowmeter（20）, pressure become Send device（22）It is connected.