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Mech remote adjustable water pressure relief valve for business pipe industry

Mech remote adjustable water pressure relief valve for business pipe industry

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SK745X Pump Control Valve is a diaphragm type of hydraulic control valve driven by the hydraulic pressure within the piping system, widely applied in the pump outlet for prevention of medium back-flow, pressure fluctuation and water hammer formation. Under normal working conditions, pressure before the valve is higher than pressure after, and the valve remains fully open. When pressure after valve exceeds pressure before valve, the valve is capable to be closed rapidly to prevent backflow of water and protect the pump and piping system. The design of the valve incorporates the function of slow-opening, quick closing, slow closing and water hammer absorption, no large pressure fluctuation within the system.

Features

Pressure from the header is directed to the bonnet of the Closing Speed Control, keeping the main valve closed if there is no flow through the two pilot valves. When one of the pilot valves opens and there is more flow out of the bonnet than is coming in, the main valve opens.

Operational principle

Mech remote adjustable water pressure relief valve for business pipe industry-1

SK745X Pump Control Valve is composed of mini strainer and ball valve, etc.

Before the pump starts, there is no pressure before the valve, and disc (5) is closed under the pressure from the spring. With the start of the pump, the pressure before the valve increases gradually. At the same time, the pressure water enters the lower cavity room (2) through the ball valve (1). The two combined force opens the disc of the basic valve rapidly to allow water supply. When the pump stops (as planned or out of accident), pressure before the valve suddenly declines. Pressure after valve exceeds that before the valve. As a result, the higher pressure flows back to the upper cavity room through the ball valve (4) and gets accumulated to drive the membrane down to close the valve disc (5). The pressure within the lower cavity room (2) discharges to the lower pressure area before the basic valve through ball valve (1), which slows down the closing process to prevent formation of water hammer.

The opening and closing speed of the valve can be controlled by adjustment of the ball valve(1) & (4). For this valve, there is also another option with dual disc design, especially good for working in complicated piping system and working conditions where there is tremendous pressure and water back-flow.


Property and advantages

• Driven by pressure of pipe system, work automatically with energy of pipe system to achieve energy conservation and environment protection.

• Controlled by the pilot valve, lower energy consumption, achieve accurate pressure reducing results, have function of stabilizing pressure after the valve.

• Dual cavity design, with functions of fully opening and fully closing. Slow shut causes no pressure fluctuation, and the diaphragm with support is well protected.

• Have internal orifice, connect bottom cavity and outlet of the basic valve, make sure stability of reaction to keep stability of pressure after the valve, avoid any vibration and noise.

• Channel with straight-flow, slight friction loss, no eddy flow and turbulent flow, cut down the damage of cavitation.

• Long pitch orientation design for stem move, stable and no gap resistance.

• Balanced automatically, big gap design on connection of disc and stem, disc is free on the vertical flat against stem, it can balance the tolerance from machining and sealing surface. Good connection without leakage. Achieve functions of both reducing dynamic pressure and reducing static pressure.

• Ductile iron castings with nodularity higher than 90%, foundry in house with advanced melting technology and strict quality control system, testing reports and testing bars can be supplied with order. Records and testing bars maintained for one year in the factory.

• Good corrosion resistance, with stainless steel, copper alloy, rubber made from DuPont and other rust- resisting material, fusion bonded epoxy coating both for interior and exterior surface of the basic valve. All the characteristics in accordance with ANSI/AWWA C550 and other international specifications like WRAS, NSF61.



Mech remote adjustable water pressure relief valve for business pipe industry-2
SK745X


Notes for installation and debugging

• All the Pressure Reducing Valves have been finished initial debugging tests before delivery. Further dubugging test is also suggested during using according to different working conditions. After the pipe system becomes stable, please loose the adjusting screw on the top of pilot valve to the top- most position.

• After the pipe system becomes stable, please loose the adjusting screw on the top of pilot valve to the top- most position.

• Tighten adjusting screw of pilot valve in clockwise slowly. When outlet pressure increase to the set pressure please fasten the locknut under the adjusting screw.

• If go beyond the set pressure during adjusting, please repeat the above steps. Remember, pressure can be only adjusting from low level to high level and pay attention to make the adjusting slowly.



Typical installation illustration


Mech remote adjustable water pressure relief valve for business pipe industry-3


Technical Parameter



Pressure

 Symbol

 Unit

Norminal Pressure



 

 

 

PN10

PN16

PN25

Min Closing Pressure

Pg

MPa

≤0.05



Slow-shut Time

t

s

2~60



Note: Slow-shut time can be adjusted as per request


Common problems and proposed solutions



Common Problems

Proposed Solutions

 

Strong vibration and noise when start- up the pump.

1.Check if there's gas in the upper cavity room. Loose the hex brass nut on the top of bonnet to discharge gas.

2.Adjust the ball valve (1) at inlet to proper opening speed.

3.Recalculate the flow and choose new valve with proper size or add throttling set.

 

Strong vibration and noise when stop the pump.

a.Adjust ball valve (4) to proper closing speed.

b.Consider to choose design of dual discs.

 

Valve does not work and cause pump's reversing.

 

a.Check if there's sundries on the sealing surface of main disc or second disc.

b.Check if damage on sealing surface of main disc or second disc.

c.Check if stem corroded or blocked.

d.Check if damage on diaphragm.
If any damaged parts found, please change new one.


Mech is tested during the production process and guaranteed that the quality meets the food grade requirements. The testing process is carried out by third-party inspection institutions who have strict requirements and standards on food dehydrator industry. It doesn't mold or deteriorate in the presence of bacteria, mold or other elements
Mech is reasonably and hygienically designed. To ensure a clean food dehydration process, the parts are properly cleaned before assembly, while the crevices or dead areas are designed with dismantled function for thoroughly cleaning. Its thickness can be customized according to needs
Mech undergoes a thorough test on its quality safety. The quality control team carries out the salt spray and high-temperature withstanding test on the food tray to check its corrosion resistant capacity and temperature resistance. The product has a good barrier effect on moisture, bacteria, and dust
The manufacture of Mech meets a very high hygienic standard. The product has no such nature that the food is in danger after dehydration because it is tested for many times to guarantee the food fits for human consumption. The product is both reusable and recyclable
The materials used in Mech is up to the food grade requirement. The materials are sourced from suppliers who all hold food safety certifications in dehydrating equipment industry. The product is liquid repellent to withstand the humid environment
The product is safe enough. The ammonia refrigerants used have a proven safety record in part because leaks are not likely to escape detection. The product is widely used in the agricultural, medical and furniture field
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