Diaphragm-Type Reducing Valve

Product Drawing

film-type reducing valves
Diaphragm-type Reducing Valves

Structrure and Function

Y42XSD diaphragm reducing valve series production have reached the international advanced level by introducing new technology and manufacturing process and the structure improvement. The valve is mainly constituted by valve body ,bonnet,compression spring, stem, piston, cylinder sleeve, seat and sealing gasket etc. Its main characteristics: back valve pressure directly impact on the piston below and keep best balance with the pressure above the piston. Action is sensitive, fast, reliable performance and long service life. diaphragm reducing valve applies to working temperature 0 ~ 90 degrees of water, air and hot-cold water supply system and fire fighting water system of the non-corrosive fluids piping and high-rise building. It can replace conventional division pipe, simplified and save system equipment and cut down engineering cost. Changing the material, the temperature can achieve 250 ° c.

Dimensions & Constructral Diagram

film-type reducing valve Constructral Diagram
Diaphragm-type Reducing Valve Constructral Diagram

Main Technical Parameter

nominal pressure inlet pressure test pressure outlet pressure P2(MPa) static and dynamic pressure difference （MPa） outlet pressure deviation value
PN(MPa) P1(MPa) PS(MPa) DN≤ 50 DN≥65
1.0 ≤ 1.0 1.5 0.1∽0.8 0.1∽0.8 0.06 ±5%
1.6 ≤ 1.6 2.4 0.1∽1.0 0.2∽1.2 0.10 ±10%
2.5 ≤ 2.5 3.75 0.15∽1.6 0.25∽1.6 0.15
4.0 ≤ 4.0 6.0 0.2∽2.5 0.3∽2.5 0.25 ±15%
6.4 ≤ 6.4 9.6 0.3∽4.0 0.4∽4.0 0.40 ±20%
10.0 ≤ 10.0 15.0 0.45∽6.0 0.6∽6.2 0.65 ±30%

Material of Main Parts

Name of Part Material
body,bonnet,lower cover Grey Cast Iron, CarbonSteel
piston,cylinder sleeve, valve rod Stainless Steel
compressed spring Si-Mn Steel
sealing gasket NBR

Main External Dimensions

Nominal Diameter DN(mm) L(mm) H(mm) H1(mm)
PN10、16、25 PN40、64、100 PN10∽64、100 PN10∽64、100
20 160 180 170 75
25 180 200 185 80
32 200 220 195 85
40 220 240 230 100
50 250 270 270 115
65 280 300 310 135
80 310 330 358 145
100 350 380 400 165
125 400 450 430 190
150 450 500 470 210
200 550 550 530 245
250 600 650 616 274
300 750 800 702 314
350 800 850 790 355
400 900 900 883 395
500 1075 1075 995 430
600 1295 1295 1150 515