Brand
Shin hong
Process custom
Connection form
Frank
Materials
Carbon steel, stainless steel, brass, cast iron, found copper, ball ink iron, alloy steel, copper alloy, plastics, ceramics, ppr, pvc, fluorine, copper
Apply media
Water, steam, oil, various highly corrosive chemical media, weak alkali media, ammonia, nitrogen, oxygen, hydrogen, liquefied gas, air, gas, dust gas
Pressure environment
Constant pressure
Working temperature
High temperature
Movement direction
Unidirectional
Driver method
Manual
Parts and components
Valve
Form
Plugs
Type
Straight
Seal
Hard seal
Common passage
15-800 mm
Standard
National criteria
Y43h steamPressure reduction valveProduct description
It's a pre-directive piston pressure-relief valve. It consists of two parts: the main valve and the guide valve. The main valve consists mainly of parts such as valves, master valves, pistons and springs. The valves consist mainly of parts such as valves, valves, membranes, springs, regulating springs, etc. The pressure-reducing pressure function is achieved by regulating the spring pressure by setting the export pressure, using changes in the film-sensitization export pressure, and by adjusting the size of the area of the main valve in which the piston moves through the main valve by opening the piston. The main product is used mainly for steam pipes, which act as pressure-reducing stabilizers and thus significantly improve performance in terms of sensitivity, flow and lifetime. This product is mainly used for steam pipes, which are highly volatile in volume and import pressures。
The purpose of this practical novelty is to achieve a truncable pressure-relief valve, characterized by a t-shaped slide in the central perforation of the valve, which has the same size as the large diameter hole in the back of the perforation, the same size of the slide pole as the small diameter hole in the front and back of the perforation of the perforation, with a ringed cavity at the intersection of the perforation of the central perforation, with a connected perforation of the corresponding valve, with a pressure-repressed gastric cavity on the upper side, with a flow hole parallel to the central perforation of the perforation, with the same cut-off area of the perforation area and the perforation of the perforation with the perforation's entry and exit of the perforation, and with the french ore at the end of the perforation linked to the front and back of the cavity, with a cavity with a cavity with a cavity with a cavity with a cavity of a cavity that is on the outside of the front of the there are holes on the wall of the short tube on the inside of the backhead centre。
The working method of the pressure reduction valve can be simply understood as the entry pressure + the export pressure = the spring force, which controls the pressure at the export point by controlling the opening size of the stopper inside the pressure reduction valve. The smaller the opening, the smaller the fluid is blocked through the stopper, the smaller the pressure loss, the greater the export pressure, the lower the export pressure。
The working method of the pressure reduction valve can be simply understood as the entry pressure plus the export pressure = spring force, as shown in the figure above:
Assuming the spring power on the film is f
The export pressure under the pressure reduction valve is f1 the entry pressure is p1 the area of the film is s1 f1 = p1 x s1
Entry pressure under pressure reduction valve core is f2. Export pressure is p2
When balance is reached: f=f1+f2=p1xs1+p2xs2
When the pressure fluctuates at the entrance, assuming that the pressure of the entry force is larger than the p2+p and the other conditions remain unchanged, the spring force f< f1+f2, the pressure under the film drives the film upwards, the spring is increased by compression f, while the cut-off is smaller, the liquid resistance becomes greater, the pressure of the export becomes smaller and the f2 becomes smaller until a new equilibrium is achieved。
The main valves of the shanghai shinkong valves ltd. Are: the pressure-relief valves (gas-relief valves, truncable pressure-relief valves, how the water-relief valves work when the pressure-reducing valves export unmanned water or when the pressure-reducing valves are closed, the export pressure continues to increase, the f2 continues to grow, pressure under the film drives the film upwards until the pressure-reducing valve is closed, when the pressure of the pressure-reducing valves is greater than the set value, but due to inertia, the motion-up film does not stop at once, and will continue to move a little further up, which is equivalent to a larger volume of the export valves, a lower pressure on the internal liquid until exactly equals the set pressure on the export of the pressure-reducing valve。
When pressure-relief valves are detected to increase, the opening of pressure-relief valves is reduced; when pressure-relief valves are detected to be reduced, the opening of pressure-relief valves is increased to meet control requirements. The pressure reduction ratio of the vapour decompression valve must be somewhat higher than the system value; it should be able to respond to positive or inverse control signals even in large or small * flows. These valves should be targeted at a useful control range, i. E. 20 ~ 80 % of *the large flow. Normal is symmetrical or has equivalence properties. These types of valves have the required flow characteristics and range for proportional control. Different forms of pressure reduction valves have different specific working principles. However, the overall rationale is that the pressure-relief valve reduces the import pressure to a desired export pressure and stabilizes the export pressure by cutting it off. However, the general pressure relief valves require that the import/export pressure differential must be thorium 0. 2 mpa。
Internal lead process:
(b) leading the valve film to react to pressure change
(a) the lead valves output the enlarged signal to the piston of the mobile main valve
Major valve compensation for rapid recovery of pressure
The operation of internal lead-down valves:
Start
- relax setting springs
- high-pressure steam and valves shut down the guide valve and the main valve
Adjusting set pressure
- tighten the spring
- open the valve
- high pressure steam on top of the piston
- steam flows through the main valve to the exit
- vapour pressure reaches below the membrane through an internal sensory hole. Side
Access to set pressure:
- the pressure on the lower side of the membrane makes the membrane move up and off the main valve
- the pressure on both sides of the piston is slowly equal, and the main valve finds a position when the downstream pressure is equal to the set pressure. Points
- the main valve position has been established, adjusted to set pressure
Characteristics of internal lead-down valves:
Small sizes
Internal passages are exempt from external takeover
Low cost of purchasing and installing in lead valves
Large charge
Accuracy above direct mode with a precision of > 5%
Internal lead
Y43h vapour pressure reduction valves require technical parameters and performance indicators:
*: shell test does not include membranes, caps
Key spare parts:
Part name
Spare parts
Valves, valves, caps
Wcb
Valves. Valves
2cr13
Pills, pistons
Aluminium iron and copper
Menu
1cr18ni9
Pistol ring
Alloy cast iron/reposition polybenzene
The valve, the valve pole
2cr13
Main valve spring
50 crva
Lead valve main spring
50 crva
Regulate springs
60si2mn
Body size (pn1. 6-4. 0): in mm
Body size (pn 6. 4-16. 0): in mm
Flow factor (cv):
Map of the installation of the pressure-relief system
When installing
(1) do not remove pressure reduction valves at will, which may affect the normal operation of the pressure reduction valves。
(2) before the tube is fitted, the pipe is cleaned and the alien and rust layers are removed, which could otherwise cause machinery failure。
(3) installation of a filter prior to the import of the pressure reduction valve (filtration network 100 or equivalent). Otherwise, it will affect the performance of the valve, which will fail to achieve the right pressure control。
(4) installation of a safety valve after pressure reduction valve. Otherwise, security alarms could not be conducted due to accidental overpressure and damage to equipment would be caused。
(5) installation of a pressure table before and after the pressure reduction valve. Otherwise, normal stress setting and control will be affected。
(6) installation of a vapour-divide valve in front of the pressure reduction valve to prevent condensation of water. Failure to do so would result in the timely release of condensed water, affect the performance of the valve or have other adverse consequences。
(7) when a fast switch valve (e. G. An electromagnetic valve) is installed, the distance from the pressure reduction valve is at least 3 m. Otherwise, pressure-relief valves may not achieve normal pressure-relief functions or significantly reduce the useful life of pressure-relief valves due to too high pressure fluctuations。
(8) in a two-stage pressure-relief system, the distance between the two pressure-relief valves is three metres less, which otherwise may affect normal use and prevent normal pressure relief。
(9) the proper installation, depending on the flow of the fluid, may affect normal use。
(10) the placement or reversal of weights on pressure reduction valves and severe vibrations are not permitted, otherwise machine failure may occur。
(11) vertically install pressure relief valves; safety valves should be set at a level slightly higher than the pressure following the pressure reduction valve, typically 10% or 0. 07 mpa
(12) when the pressure reduction ratio is large, multi-level pressure reliefers shall be installed to ensure a flow rate of 30 m/s in the pipe. Sufficient space should be set aside above and below the pressure reduction valve in order to be easily dismantled and replaced
Operational instructions
Warning (1) direct contact with the valve with bare hands is not permitted, otherwise it may cause burns。
(1) prior to operation, the break valves before the pressure reduction valves are shut down and all foreign matter and rust are removed by side roads, which may otherwise cause pressure reduction valves to fail to function properly。
(2) the secondary pressure through the bypass line shall be below the defined pressure. Otherwise, the safety valve jumps because the secondary pressure through the bypass line is higher than the set pressure。
(3) when the pressure is adjusted, slowly and gently adjust the screws, and inappropriate adjustment operations may cause damage to the pressure-relief valve or other equipment, such as water or banging。
(4) condensed water in pipes shall be excluded and, when not used for a long period of time, the cut-off valve before and after the pressure reduction valve shall be closed. (steal rust in the pipes can cause trouble)
(5) when a hand handle model is indeed required, the handle shall first be pressed and then the wheel adjusted; it shall not be too large or too fast to damage the handle。
Pressure adjustment steps
The sequence can be completed by slowly moving the screws as follows. Improper adjustment operations may result in water-shocking or banging, etc., and may cause damage to pressure-relief valves or other equipment。
(1) to close the pressure-relief valve before and after the break valve, to open the bypass line and to maintain sufficient time to complete the clean-up of alien or rusty layers in the pipe using a negotiable medium, in cases where the safety valve cannot afford to jump. After the blow-out was completed, the bypass line was closed to cut off the valve。
(2) the slow opening of the cut-off valve installed before the pressure reduction valve and the adjustment of the opening of the cut-off valve after the pressure reduction valve to maintain a small flow of the pipe。
(3) unlock the nut, slowly turn the screws and observe the pressure gauges after the valve until the required implantation (the clockwise spin pressure rises and the counterclockwise pressure decreases). In the case of a handle model, the handle is in its own position, so when the pressure is adjusted in its normal condition, it should first press the handle, release it, and then slowly move the screws and adjust the screws, and observe the near pressure table of the valve until the required implantation (when the time needle turns the handle, the pressure rises; when the counter-clock needle turns the handle, the pressure drops)。
(4) disconnect the pressure-relief valves slowly and in accordance with the steps
(3) further adjust the post-valve pressure until the required implantation。
(5) when the adjustment is completed, screw the nut. For a handle model, the handle is pulled and the internal device is used to tighten; if the handle is not tight, the handle is left and right。
Install reference example:
The order requires:
I. Whether product name and model 2 cal. 3 are accompanied by an attachment so that we can use the temperature of the medium used for pressure 5 for type 4 correctly chosen。
2. If the model of the company has been selected by the design unit, order directly from our division's sales department by model。
When the occasion used is very important or complex, please provide as much design drawings and detailed parameters as possible, which will be cleared for you by our valve company experts. The product belongs to the pistol depression valve series, and thanks to you for visiting our shin hong valve if you have any questions. You can call us and we will do our best to serve you well. More information on other pressure relief valve products can be viewed by clicking on the pressure relief valve if necessary。
