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Mech Top pressure relief valve design factory pipe industry

Mech Top pressure relief valve design factory pipe industry

Connection Ends
Flange to BS EN 1092-2:1997
Temperature Range
0℃- 80℃
Coating
Fusion Bonded Epoxy Coating in accordance with ANSI/AWWA C550
Working Pressure
PN10/PN16
Price
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Statement


SK780X Pressure Differential By-pass Balancing Valve is a diaphragm type of hydraulic control valve driven by the hydraulic pressure within the piping system, widely applied in HVAC system for guarantee of flow stability in the air conditioning, refrigeration and heating system and pump working. The valve prevents the effect on the other pipe branches when there is fluctuation on one branch by balancing of pressure in the radiant and distribution water manifold, thus to protect the efficient and safe working of the refrigeration set or heating set.

Features

Operational principle

Mech Top pressure relief valve design factory pipe industry-1

SK780X Pressure Differential By-pass Balancing Valve is composed of pressure balancing pilot valve, needle valve (or ball valve), mini strainer and ball valve, etc.

SK780X Pressure Differential By-pass Balancing Valve is installed between radiant and distribution water manifold (water supply and water return). Water flow enters continuously from water supply duct to the valve inlet and then to the upper cavity room (2) through needle valve (1) (or ball valve). Pilot valve (3) is connected to the water supply duct and return duct by guide tube (4) and (5) to sensing of the pressure difference and adjustment of the opening position of the pilot valve accordingly. When the pressure difference is large, pilot valve opens broadly, the pressure inside upper cavity room (2) declines and the basic valve opens broadly. As result the water flow between the supply and return duct increase and the entire system gets balanced. When the pressure difference is small, pilot valve (3) turns to close at the pressure of the spring, the pressure inside upper cavity room (2) increase and the basic valve turns to close. As result the water flow between the supply and return duct decreases and the entire system also gets balanced.


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 Top pressure relief valve design factory pipe industry-2
SK780X


Notes for installation and debugging

• The valve has been finished initial debugging tests before delivery. Further debugging test is also suggested during using according to different set-conditions.

• Over review pressure meter of water knockout drum and water collector, adjust pilot valve (3) according to set-difference of pressure. Clockwise is for increasing the pressure difference and anti-clockwise is for reducing pressure difference when set adjusting screw on the top of pilot valve. When adjusting is done, fasten the lock nut. Then you'll got set-difference for the pressure no matter how the pressure of pipe system changes.

• Adjust needle valve (ball valve) can achieve different movement speed for the basic valve. Normally, it has been adjusted well before delivery. No further adjusting suggested if no special notice.



Typical installation illustration


Mech Top pressure relief valve design factory pipe industry-3



Common problems and proposed solutions



Common Problems

Proposed Solutions

 

Pressure difference is smaller than set-value and does not reach the set-difference.

a.Check if any sundries on the sealing surface of basic valve or pilot valve.

b.Check if any damage on the sealing surface of basic valve or pilot valve.
c.Check if needle valve (ball valve) (1) was closed or almost closed. If yes, please open it.

Pressure difference is bigger than set-value and does not reach the set-difference.

a.Check if ball valve (6) at outlet was closed. If yes, please open it.

b.Check if there's any block for pilot valve.


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. The product has the advantage of excellent moisture resistance
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. Made of polypropylene filament fibers, the product features good heat preservation
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 can be used as insulation and moisturizing covering materials, sunshade materials, packaging materials, etc
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 light in weight, so it is easy to be carried anywhere
The product is safe enough. The ammonia refrigerants used have a proven safety record in part because leaks are not likely to escape detection. It doesn't mold or deteriorate in the presence of bacteria, mold or other elements
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