Two-Step Valve

Kitz SCT's Two-Step Valve combines all the components of a traditional by-pass system into one. The KDT series pneumatic diaphragm design provides 2 flow abilities, allowing for manual pre-set slow flow control as well as full flow.

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FEATURES

An epoch-making combination valve that enables manual flow control and fully on/fully off two-stage control by means of an air actuator.
The control of the fluid by means of a diaphragm rather than a needle realizes a particle free valve and speedy gas supply.
Significant cost savings and space savings are possible by eliminating bypass pipings and control instrumentation required for conventional systems.
The optimal Cv value for the usage objectives can be set arbitrarily.

WETTED AREA MATERIAL

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

PRECAUTIONS

In cases where the pressure inside the valve is lower than atmospheric pressure, micro-adjustments of the Cv value may be difficult. Set the Cv value under the same conditions as those of actual usage.
Flow rates outside the adjustment range will not be reproducible.
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

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Product Details

Specifications
Size		KD4T (1/4")	KD8T (1/2")
Cv		Adjustment range: 0.02-0.12, when fully open: 0.27	Adjustment range: 0.05-0.26, when fully open: 0.7
Maximum Operating Pressure		142psig(0.98MPa (G))
Wetted Area Volume		0.083in³ (1.36cm³)	0.447in³ (7.3cm³)
		Straight flow, CVC male, OPEN state
Fluid Temperature	PCTFE	-10ºC~80ºC (when open)
	PFA	-10°C~120°C (150°C actual results 500,000 cycles )
	PI	-10ºC~150ºC
Atmospheric Temperature		-10ºC~60ºC
Leak Rates	Across the Seat He Leak Test Rates	≤ 1×10^-9 sccs (≤ 1×10^-10Pa·m³/sec)
	Inboard He Leak Test Rates	≤ 1×10^-9 sccs (≤ 1×10^-10Pa·m³/sec)
Actuation Pressure		0.4~0.7MPa (G)
Cycle Life*		2 million cycles
*Test Condition / Seat material : PCTFE Gas : N2 Pressure : 0.98MPa
Product Grade
Grade	STD	EP	SEP
Body Material	SUS316L		SUS316LE (Double melt material)
Surface Roughness	≤ Rz 3.2 µm	≤ Rz 0.7 µm
	≤ Ra 0.5 μm / 20 μin	≤ Ra 0.13 μm / 5 μin
Polish	Mechanical Polished	Electro Polished
Cleaning	Degreasing + Precision cleaning
Packaging	Single bagged package	Double bagged package

PRODUCT CODE KEY

Model	Size	Operation	Valve Shape		Connection	Seat Material		Grade + Body Material
KD	4	T	S	-	V	C	-	EP-316L
KD - type diaphragm valve	4: 1/4" 8: 1/2"	T: Two-step	S: Straight A: Angle (Option) B: Branch (Option)		V: CVC male VF: CVC female	C: PCTFE A: PFA P: PI		STD-316L: Mechanical Polished + SUS316L EP-316L: Electro Polished + SUS316L SEP-316LE: Electro Polished + SUS316LE