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Mech New 1.5 pressure reducing valve Supply piping system

Mech New 1.5 pressure reducing valve Supply piping system

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


SK760X Slow Shut 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

Operational principle

Mech New 1.5 pressure reducing valve Supply piping system-1

SK760X Slow Shut Control Valve is composed of needle valve, 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 needle 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 needle 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 needle 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 needle 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 New 1.5 pressure reducing valve Supply piping system-2
SK760X


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 New 1.5 pressure reducing valve Supply piping system-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 needle 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 needle 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.


The production of Mech is rigorous. Along with the materials that furnish the look and feel of a building, technologies applied are also highly demanded. Being a good and indispensable life helper, it is widely used by people in their daily life
We conduct process inspection in Mech manufacture. Common assessments, such as colorfastness to washing and rubbing, fiber strength, fiber structure, and chemical reagents are carried out by the QC team. The product is easy to use without much effort to grip
Mech is strictly inspected by our QC team. It is checked in terms of the circuit board, plugs, voltage, housing, etc. Being polished, the product has a smooth and bright finish
The quality control for Mech is required to carry out thoroughly. Before packaging, it will be checked to make sure no impurities are included, and it will be packaged with thick corrugated paper to protect the four corners. It is sold to the Walker, Sony, and TCM companies
Mech is innovatively designed. It is carried out by our designers who know how to minimize susceptibility and radiation of the electric appliances. Its durable and strong structure makes sure that it is not easy to break
Our has the characteristics of strong corrosion resistance, strong impact resistance, good wear resistance and compression resistance, durable and long service life.
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