| After-sales Service: | 12 Months |
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| Warranty: | 12 Months |
| Manufacturing Process: | Forging |
| Surface Treatment: | Polishing |
| Operation Pressure: | Atmospheric Pressure |
| Material: | Cast Steel |
| Customization: |
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Suppliers with verified business licenses
Audited Supplier The function of the manual pressure reducing and overflow valve in the ground blowout preventer control device is to reduce the high pressure oil (21Mpa) in the accumulator to the lower pressure required to control the blowout preventer (usually 10.5Mpa). In addition, under certain working conditions, the valve also has the function of automatic overflow and pressure reduction, so the method has two functions: oil tines and overflow.2. Main technical parameters
Model:JYS21-25
Nominal Pressure (MPa):21
Nominal Diameter (mm):25
Flow(L/Min):160
Jobs Pressure( Mpa):0~21
Adjustment Range (Mpa):0~14
Weught:22KG
Volume (cm³):21.8*13.8*48
3. Structure
As shown in the figure, the pressure relief valve is mainly composed of the following parts:
Handwheel, locking handle, adjusting screw, spring adjusting cover, spring guide plate, large spring, small spring, connecting rod, guide sleeve, valve body, sealing box, oil inlet flange, pressure relief sealing ring, spring, drain Oil seal ring, wave spring, oil inlet plunger, lower plug, oil outlet flange.
The sealing box is equipped with a pressure reducing sealing ring and an oil drain sealing ring. There is a spring between the decompression sealing rings, and a wave spring is installed between the oil drain sealing rings. Each sealing ring contacts the oil inlet plunger to form an annular flat sealing belt. The oil inlet plunger is provided with an oil inlet and an oil outlet, and a pressure oil outlet after decompression is provided above the valve body. The outlet pressure adjustment after decompression is achieved by rotating the handwheel to compress the large spring and the small spring. When adjusting the pressure, the handwheel rotates clockwise as a compression spring, and the compression of the spring increases. The outlet pressure rises. Conversely, the outlet pressure decreases. After the outlet pressure is adjusted, lock the skipping screw with the lock handle.
4. Working principle
As shown in the figure, the pressure oil P1 entering from the oil inlet passes through the throttle K (the gap formed between the oil inlet on the oil inlet plunger and the pressure reducing seal ring) to decompress to P2 and enter the valve cavity. At this time, the oil outlet does not open. Under the action of hydraulic pressure, the sealing box moves up to seal the oil inlet and the drain port, and maintains the pressure in the valve cavity after decompression is P2. The sealing box is under the spring force and hydraulic pressure. Under the action, in a state of equilibrium.
Once the oil outlet is opened, due to the hydraulic power generated by the flow of the liquid, the sealed box moves down (the spring is extended and the spring force is reduced), and the adjusted orifice K reappears. The pressure oil is continuously discharged from the oil outlet after decompression. At this time, the sealed box is in a new balance under the reduced spring force, hydraulic pressure and hydraulic power.
If the oil outlet is closed, the hydraulic power disappears, the sealing box loses balance and moves upward to seal the oil inlet and drain. The spring returns to its original compression, so that the sealed box reaches its original equilibrium state.
Due to the increase in pressure at the oil outlet, the pressure in the valve cavity also increases, destroying the balance of the sealed box. The sealed box is moved up to open the original closed drain port to overflow. After causing the pressure oil in the valve cavity to reach the original decompression value, the drain port is closed and the sealed box returns to the original equilibrium state. This is the situation when the Annular BOP is closed and the drill tool needs to be lifted and passed through the drill pipe joint.
When the drill pipe joint enters the sealing rubber core of the awakening blowout preventer, the drill pipe joint larger than the diameter of the drill pipe squeezes the rubber core, and the rubber core is forced to move down by the piston, and the inlet rigid volume decreases, which makes the pressure relief valve When the outlet pressure rises, the seal box moves up, so that the drain port opens and overflows until the outlet pressure is restored to the original setting, so as to protect the sealant core of the annular blowout preventer from damage.
When the drill pipe joint passes through the rubber core of the annular blowout preventer, the diameter of the drill pipe joint is larger than the diameter of the drill pipe, which causes the drill pipe joint to squeeze the rubber core outward, causing the pressure at the outlet of the relief valve to increase. . However, as long as the pressure increases, the original balance with the spring force will be destroyed, and the seal box will be lifted up. As a result, the drain seal ring at the lower part of the seal box and the drain port on the oil inlet plunger appear. Crescent-shaped gap. At this time, part of the pressure oil in the valve cavity will overflow from this gap and return to the oil tank, thereby reducing the outlet pressure of the valve. Until it is balanced with the set spring force again, and the sealed box moves downwards, the crescent-shaped gap disappears and the overflow stops. In this way, the outlet pressure of the valve can always be maintained at the set value, so as to protect the sealant core of the annular blowout preventer from damage.
The functions of the spring and the wave spring are: one is to ensure the seal, and the other is that when the sealing surface of the decompression sealing ring or the drain sealing ring is worn, it can realize self-compensation to maintain the normal sealing effect.
5. Features and instructions
In the process of pressure regulation, the pressure rises in a stepped manner, but it is more stable when the pressure is reduced.
When leaving the factory, the outlet pressure of the pressure reducing and overflow valve is adjusted to 10.5Mpa. If the user needs a lower pressure, he can turn the handwheel 1 counterclockwise to reduce the outlet pressure.
In the system, the oil inlet of the pressure relief valve is equipped with an oil filter. Please pay attention to cleaning the oil filter to prevent dirt from entering the valve and hindering the normal operation of the valve.
When the oil pressure at the oil inlet of the valve changes, the outlet pressure of the valve is not affected.
JYS21-25 Manual regulator in the control system for surface BOP stacks functions in reducing the high oil pressure (21Mpa) in the accumulator to the low pressure (generally 10.5MPa) needed for controlling BOPs. In addition, this valve also undertakes the task of automatic overflow and pressure reduction under a certain operating conditions. Therefore, the valve has two functions such as pressure reduction and overflow
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Model:
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JYS21-25
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Operating pressure:
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21MPa
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Drift diameter:
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25mm
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Rated flow rate:
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160L/min
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Pressure regulating range
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0~14MPa
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Weight:
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26Kg
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Model:
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JYSQM 21-25
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Operating pressure:
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21MPa
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Drift diameter:
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25mm
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Rated flow rate:
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160L/min
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Pressure regulating range
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0~14MPa
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Weight:
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33Kg
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1) About Packing
Inner packing: white box, color boxes (upon request), Outer packing: cartons or pallets
2) Terms of payment:
We accept T/T,L/C
3)Terms of Shipment:
About 30 days after receiving the advance payment,or according to both parties agreement
4)Ports of shipment:
Tianjin,Qingdao, shanghai or other required Port, by sea or air
5)Guarantee:
One year since delivery.
6)Inspection:
100% testing before delivery.
Shandong Yacheng Petroleum Technology Co.,Ltd.(YCPT) is located in the second largest oilfield in Dongying city. We are the subsidiary of Xincheng Petroleum of Xincheng Petroleum Group,which was founded since 2003. We are first class supplier in vendor list of CNPC,SINOPEC,and CNOOC,and member of CCOIC, CCPIT and so on.
We have 19 years of experience in research,development and manufacturing of oil drilling equipment and drilling string, We have professional sales and after-sales service teams We are committed to develop, manufacture and supply of oilfield equipment, like oil and gas Gate Valve, Mud Pump and Spare Parts, Handling Tools,Drilling String, Well Control Equipments.
We have established a complete quality control system, all products & equipment manufactured as per international standard ISO 9001 and API standard. Based on our talented experienced technician team and sincerely marketing strategy, we have exported our products to more than 30 countries. The positive feedback from our clients are encouraging us to do much better and more strict on self-requirement. We will continue to provide quality products with favorable prices to all customers!
Welcome to Dongying city and visit our company. Let's open the delightful business cooperation!
1. who are we?
We are based in Shandong Province, China, start from 2016,sell to Eastern Europe(17.00%),Mid East(16.00%),Southeast Asia(16.00%),South America(15.00%),North America(14.00%),Eastern Asia(10.00%),Western Europe(8.00%),Oceania(2.00%),Africa(2.00%). There are total about 11-50 people in our office.
2. how can we guarantee quality?
Always a pre-production sample before mass production;
Always final Inspection before shipment;
3.what can you buy from us?
API 6A Gate Valve / Mud Pump Spare Parts / Handling Tools / Drilling String / API 16A Well Control Equipments
4. why should you buy from us not from other suppliers?
we have been exporting drill pipe, handing tools,mud pump parts and well control equipments to well-known oil service companies in the world .We are the first class supplier of CNPC,SINOPEC,and CNOOC.
5. what services can we provide?
Accepted Delivery Terms: FOB,CFR,CIF,EXW,CIP,FCA,CPT,Express Delivery;
Accepted Payment Currency:null;
Accepted Payment Type: T/T,L/C,Credit Card,PayPal,Western Union,Cash;
Language Spoken:English,Chinese,Russian.
Suppliers with verified business licenses
Audited Supplier 
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