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Neck Flange Check Valve

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Neck Flange Check Valve NRVD Type

Neck Flange Check Valve NRVD Type is mainly used in the pipeline which only allows the medium to flow in one direction and prevents the reverse flow. Under the action of the fluid pressure flowing in one direction, the valve disc opens; when the fluid flows in the opposite direction, the fluid pressure acts on the valve seat to seal, thus cutting off the flow.

Applicable Medium: R12, R22, R502, R134a, R404A, R507, R717 and other refrigerants. 


Product Information

Neck Flange Straight Check Valve

Technical Parameter

Nominal Diameter: DN25-DN150;

Nominal Pressure: 2.5MPa; 

Applicable Medium: R12, R22, R502, R134a, R404A, r507, R717 and other refrigerants. 

Applicable Temperature: - 50 ℃ ~ + 150 ℃; 

Opening Pressure Difference: 0.04bar

Neck Flange Check Valve

Type

Nominal Diameter

(DN)

Size(mm)

φA

φB

φC

φD

φE

L1

L2


A

B






NRVD

25

25

33.7

32

68

115

85

65

145

32

32

42.4

38

78

140

100

65

149

40

40

48.3

45

88

150

110

70

160

50

50

60.3

57

98

165

125

80

176

65

65

76.1

76

120

185

145

90

192

80

80

88.9

89

138

200

160

100

216

100

100

114.5

108

160

235

190

114

244

125

125

139.7

133

188

270

220

124

260

150

150

168.3

159

218

300

250

144

294