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Fakai Valve Factory Site: Yongxing Industrial Zone, Longwan District, Wenzhou City Tel: 0577-88767789
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DH44Y Swing Check Valve

DH44Y Swing Check Valve Structure
DH44Y Swing Check Valve Structure

Scope of application

The disc of DH44Y rotary check cryogenic check valve is disc-shaped, and rotates around the rotating shaft of the valve seat channel. Because the channel inside the valve is streamlined, the flow resistance is smaller than that of butterfly check valve, which is suitable for Large-caliber occasions where the flow does not change often, but it is not suitable for pulsating flow, and its sealing performance is not as good as that of the lifting check valve. The low temperature check valve is suitable for pipelines with various working conditions, such as petroleum, chemical and thermal power stations, with a nominal pressure of PN1.6 ~ 6.4MPa and an operating temperature of -29 ~ 550 ℃. Applicable medium: water, oil, steam, etc.

working principle

During the use of this low temperature check valve, the medium flows in the direction of the arrow shown in the figure

  1. When the medium flows in the specified direction, the valve disc is opened by the force of the medium; when the medium is countercurrent, the valve disc is tightly sealed with the sealing surface of the valve seat due to the valve ’s own weight and the valve ’s reverse force. Close to achieve the purpose of preventing the medium from flowing backward.
  2. The sealing surfaces of the valve body and valve disc are made of stainless steel.
  3. The structure length is in accordance with GB12221-1989, and the flange connection size is in accordance with JB / T79-1994.

Implementation standards

project Design and manufacturing Structure length Flange standard Inspection and test
standard API 600 ANSI B16.10 ANSI B16.5 API 598

Parts material

Part Name Body, bonnet, disc, rocker Pin, nut Double nut Sealing surface filler
material A352-LCB, A352-LC3, A351-CF8 A182-F304 Cr-Mo steel Cobalt-based Teflon

Performance specifications

model Nominal pressure PN (Lb) Test pressure at room temperature Low temperature seal test pressure (MPa) Working temperature and applicable medium
case seal
DH44Y-150 (Lb) 150 3.0 0.6 0.6 -46 ℃
Ammonia, liquid nitrogen, propane
-101 ℃
Ethylene, carbon dioxide
-196 ℃
Methane, LNG
DH44Y-300 (Lb) 300 7.5 0.6 0.6
DH44Y-600 (Lb) 600 15.0 0.6 0.6

Dimensions

Nominal diameter NPS in 2 3 4 6 8 10 12 14
mm 40 50 65 80 100 150 200 250 300 350
DH44Y-150Lb
L 165 203 216 241 292 356 495 622 698 787
H 154 175 177 191 222 325 383 448 540 560
Kg 14 18 twenty two 30 46 82 116 158 238
DH44Y-300Lb
L 241 267 292 318 356 445 533 622 711
H 172 198 204 222 277 346 412 465 562
Kg 18 26 34 45 64 105 167 272 375