NRHD Diaphragm Valves

The NRHD series, or High Flow NRD valves, uses the new high output style actuator to achieve Cv 1.0 at pressure.

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FEATURES

Slim and compact design
Lineup of high flow types
Adoption of springless diaphragm structure

WETTED AREA MATERIAL

SUS316L, SUS316LE (Double melt material)
PCTFE, PI
Cobalt alloy

PRECAUTIONS

The valves are designed to be used under atmospheric pressure. Usage such as under vacuum vessels are not guaranteed.
For high temperature applications, please select appropriate material for air-fittings and tubes to assure proper performance.

Product Selection

JUMP TO: Specifications Product Grade Product Code Key Product Selection

Product Details

Specifications
Series		NRHD4	NRHD8
Maximum Operating Pressure (Positive Pressure / Back Pressure)		20.6MPa(G)
*Cv 1**		0.25	1.0
*Wetted Area Volume (CVC Male Connection) 2**		1.31cm³	7.70cm³
Fluid Temperature	PCTFE	－10 ～ 42℃
	PI	－10 ～ 150℃ *3
Atmospheric Temperature	PCTFE	－10 ～ 40℃
	PI	－10 ～ 60℃
Leak Rates	Across the Seat He Leak Test Rate	≦ 1Ｘ10^‐10Pa・m³/sec
	Inboard Leak Test Rate	≦ 1Ｘ10^‐10Pa・ｍ³/sec
Operation Pressure (Pneumatic Valve Only)		0.4～0.6MPa(G)	0.5 ～ 0.7MPa(G)
Cycle Life (N2 Charged, Own Test)	Manual Valve	30,000 cycle	5,000 cycle
	Pneumatic Valve	100,000 cycle	40,000 cycle
1 The minimum Cv value measured based on SEMASPEC-90120394B-STD (room temperature) is described. 2 For the NRMD8 series, the internal volume of a CVC female connection is applied. *3 Where sleeve joints of 3/8” or more and pipe fittings are used, the upper limit of the fluid temperature range is 96ºC.
Product Grade
Grade	STD	EP	SEP
Body Material	SUS316L		SUS316LE (Double melt material)
Surface Roughness	≦ Rz 3.2μm	≦ Rz 0.7μm
Polish	Mechanical Polished	Electro Polished
Cleaning	Degreasing + Precision cleaning
Packaging	Single Package	Double Package

PRODUCT CODE KEY

Model + Size

Operation

Valve Shape

Pressure

Connection

Fitting Size

Seat Material

Flow

Handle Color Optional

Flow

Grade + Body Material

NRHD8

EP-316L

NRHD4: 1/4" Cv 0.25 High Flow Type
NRHD8: 1/2" Cv 1.0 High Flow Type

C: N.C.
M: 270° Manual Valve

S: Straight
A: Angle
L: L-Shape
B: Branch

I: 20.6MPa

V: CVC male
VF: CVC female
W: Butt weld
S: Compression
*1

Not shown: 1/4" (Standard)
6: 3/8"
8: 1/2"

C: PCTFE
P: PI

Not shown: Standard
A: A flow
B: B flow
C: C flow

Not shown: Blue (standard)
RD: Red
GR: Green
SL: Silver
BK: Black
WH: White
YE: Yellow

A: A flow
B: B flow
C: C flow

STD-316L: Mechanical Polished + SUS316L
EP-316L: Electro Polished + SUS316L
SEP-316LE: Electro Polished + SUS316LE

*1 In cases where there are different types of fittings, please note them in the order of Port A, B, and C of the internal flow in the diagram to the right.
Example: In the case where A port = CVC 1/2" male, B port = CVC 1/4" male, C port = CVC 1/2" female, the model will be "NRHD4CBI-V8VVF8C-A-EP-316L".