High-quality 1 2 pressure reducing valve antic manufacturers piping system

Statement

SK720X Pressure Reducing Valve is a diaphragm type of hydraulic control valve driven by the hydraulic pressure within the piping system. The function of the valve is to reduce the high pressure to the pre-set low pressure, and despite the ﬂuctuation of medium ﬂow or pressure before the valve the pressure after the valve will always remain stable and maintain the set pressure range.

Features

◔Operational principle

High-quality 1 2 pressure reducing valve antic manufacturers piping system-1

SK720X Pressure Reducing Valve is controlled by pressure reducing pilot valve and equipped with pressure reducing pilot valve, needle valve, mini strainer and ball valve, etc.
Under normal conditions, water ﬂow comes continuously from the inlet opening to the upper cavity room.

of the basic valve through the needle valve (1); When the pressure before the pilot valve (3) is lower than its pre-set value, the pilot valve will remain at full open position and the upper cavity room of the basic valve is not able to get accumulating pressure. Under this condition, the disc of the basic valve will be open at the water pressure from the inlet opening to allow water ﬂow. The pressure reducing pilot valve closes gradually when the pressure after pilot valve exceeds its pre-set value. Pressure gets accumulated within the upper cavity room and membrane drives the disc down to close the valve till the pressure after the pilot valve gradually reduces to its pre-set value. The pilot valve opens again when the pressure after the valve becomes lower than the pre-set value, and the basic valve will then open with the release of the accumulated pressure in the upper cavity room.

The throttle oriﬁce (5) that connects the lower cavity to the outlet serves to keep the reaction of the valve gentle and stable. The ball valve (4) controls the outlet water ﬂow rate from the upper cavity room and thus to stabilize the action of the basic valve. The ball valve can be adjusted with different working conditions. In case of emergency, the ball valve can also be closed manually for cutting off of the basic valve.

◔ 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.

High-quality 1 2 pressure reducing valve antic manufacturers piping system-2

SK720X

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.

MATERIAL SPECIFICATION

Pressure	Symbol	Unit	Nominal Pressure
			PN10	PN16	PN25
Max. Inlet pressure	P1max	MPa	1.0	1.6	2.5
Min. Inlet pressure	P1min		P2max + 0.2
Max. Outlet pressure	P2max		0.8	1.0	1.6
Min. Outlet pressure	P2min		0.05
Characteristics of ﬂow deviation	ΔP2Q		≤10%
Pressure characteristic deviation	ΔP2p		≤5%
Min. pressure deviation	ΔPmin		0.2

Typical installation illustration

High-quality 1 2 pressure reducing valve antic manufacturers piping system-3

Common problems and proposed solutions

Common Problems	Proposed Solutions
Outlet pressure is similar with inlet pressure, no pressure reduction.	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 any damage or fatigue on spring of basic valve or pilot valve. d.Check if any damage or fatigue on diaphragm of basic valve or pilot valve. e.Check if any corrosion or blocking on stem of basic valve or pilot valve.
Strong vibration and noise.	1.Close the needle valve before the basic valve and open 1/4 turns slowly. Open the big hex screw on the top of bonnet, release air. Adjust the needle valve on inlet conduit slowly until no vibraion. 2.Calculate the ﬂow again and collect proper size of valve or add throttling set.
Pressure after the valve is not stable.	a.Check if pressure is ﬂuctuating strongly at inlet. Try to keep it within small range. b.Check if required ﬂow is too different than actual ﬂow, recalculate ﬂow and choose new valve with proper size.

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During the production of Mech , it is strictly tested, including lifetime test, heat and power breakdown test, and mechanical damage test.

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The production of Mech includes overall three parts: the production of filament, the bulb, and the base, which is highly automated.

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The production of Mech is strictly controlled with necessary electrostatic protection, from the production environment and equipment to operation staff.

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Mech is manufactured utilizing a complete slate of necessary equipment including state-of-the-art photometric equipment and CNC machine.

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The inspections of Mech are rigorously carried out by our professional QC team. These inspections include optical resolution, defect detection, structural integrity, etc.

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The product does not accumulate too much heat. It has a radiator that can absorb the heat produced and then effectively dissipate the heat into the surrounding environment.

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