Block-and-Bleed Valves | McMaster-Carr

	Pipe Size Pipe Size

1/4

1/2

3/4

	Body Material Body Material

Stainless Steel

Steel

	For Use With For Use With

	Maximum Pressure Maximum Pressure

	Gender Gender

Female

Male

	Valve Type Valve Type

Needle

Ball

	Handle Type Handle Type

Standard

Dual Standard

	Handle Style Handle Style


T-Handle	Lever

	Valve Function Valve Function

Flow Adjustment

On/Off

	Seal Material Seal Material

Rubber

Plastic

	Flow Coefficient (Cv) Flow Coefficient (Cv)

	Needle Material Needle Material

316 Stainless Steel

17-4 PH Stainless Steel

	Seat Material Seat Material

PEEK Plastic

Acetal Plastic

	Seat Type Seat Type

Metal-to-Metal

Bubble-Tight Soft

	Type Type

Connector

Adapter

	Overall Length Overall Length

	Overall Height Overall Height

3 5/8"

3 13/16"

5 7/8"

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

RoHS Compliant with
Exemptions

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

	Maximum Temperature Maximum Temperature

445° F

450° F

	End-to-End Length End-to-End Length

2 1/2"

3 1/2"

5 3/8"

	Gauge Port Pipe Size Gauge Port Pipe Size

27 Products

About Precision Flow-Adjustment Valves

About On/Off Valves

Female × Female

Female × Male

Valve Type: Needle
For Use With: See table
Seal Material: Fluoroelastomer Rubber

Also known as block and bleed valves, these have a vent port that allows you to remove instrumentation equipment attached to the valve without depressurizing your line. Turn the handle to shut off flow and remove the vent port plug to drain liquid trapped in the valve. Valves adjust flow in small increments for metering, sampling, and other applications requiring fine flow control.

316 stainless steel valves are more corrosion resistant than steel valves.

Metal-to-metal seats resist temperature fluctuations.

Bubble-tight soft seats provide a tighter seal than metal-to-metal seats when the valve is completely closed.

Flow coefficient (Cv) is the amount of water (in gallons per minute) at 60° F that will flow through a fully open valve with a difference of 1 psi between the inlet and the outlet.

For technical drawings and 3-D models, click on a part number.

316 Stainless Steel Body—Metal-to-Metal Seat
Pipe Size	Flow Coefficient (Cv)	Max. Pressure	End-to-End Lg.	For Use With		Each
NPT Female × NPT Female
1/4	0.44	10000 psi @ 200° F	2 1/2"	Water, Oil, Air, Argon, Helium, Krypton, Neon, Xenon	0000000	0000000
1/2	0.44	10000 psi @ 200° F	2 1/2"	Water, Oil, Air, Argon, Helium, Krypton, Neon, Xenon	0000000	000000
NPT Female × NPT Male
1/4	0.44	10000 psi @ 200° F	3 1/2"	Water, Oil, Air, Argon, Helium, Krypton, Neon, Xenon	0000000	000000
1/2	0.44	10000 psi @ 200° F	3 1/2"	Water, Oil, Air, Argon, Helium, Krypton, Neon, Xenon	0000000	000000
316 Stainless Steel Body—Bubble-Tight Soft Seat
NPT Female × NPT Female
1/4	0.76	6000 psi @ 200° F	2 1/2"	Water, Air, Argon, Helium, Krypton, Neon, Xenon	0000000	000000
1/2	0.76	6000 psi @ 200° F	2 1/2"	Water, Air, Argon, Helium, Krypton, Neon, Xenon	0000000	000000
NPT Female × NPT Male
1/4	0.76	6000 psi @ 200° F	3 1/2"	Water, Air, Argon, Helium, Krypton, Neon, Xenon	0000000	000000
1/2	0.76	6000 psi @ 200° F	3 1/2"	Water, Air, Argon, Helium, Krypton, Neon, Xenon	0000000	000000
Carbon Steel Body—Metal-to-Metal Seat
NPT Female × NPT Female
1/4	0.44	10000 psi @ 200° F	2 1/2"	Oil, Air, Argon, Helium, Krypton, Neon, Xenon	0000000	00000
1/2	0.44	10000 psi @ 200° F	2 1/2"	Oil, Air, Argon, Helium, Krypton, Neon, Xenon	0000000	00000
NPT Female × NPT Male
1/4	0.44	10000 psi @ 200° F	3 1/2"	Oil, Air, Argon, Helium, Krypton, Neon, Xenon	0000000	00000
1/2	0.44	10000 psi @ 200° F	3 1/2"	Oil, Air, Argon, Helium, Krypton, Neon, Xenon	0000000	00000
Carbon Steel Body—Bubble-Tight Soft Seat
NPT Female × NPT Female
1/4	0.76	6000 psi @ 200° F	2 1/2"	Air, Argon, Helium, Krypton, Neon, Xenon	0000000	00000
1/2	0.76	6000 psi @ 200° F	2 1/2"	Air, Argon, Helium, Krypton, Neon, Xenon	0000000	00000
NPT Female × NPT Male
1/4	0.76	6000 psi @ 200° F	3 1/2"	Air, Argon, Helium, Krypton, Neon, Xenon	0000000	00000
1/2	0.76	6000 psi @ 200° F	3 1/2"	Air, Argon, Helium, Krypton, Neon, Xenon	0000000	00000

Threaded Precision Flow-Adjustment Valves with Gauge Ports

Valve Type: Needle
For Use With: See table
Seal Material: Fluoroelastomer Rubber

With a gauge port on each side of these valves, you can install two pieces of instrumentation equipment to simultaneously monitor multiple media properties without interrupting flow. Turn the handle to adjust flow in small increments for metering, sampling, and other applications requiring fine flow control. Valves have a 316 stainless steel body for excellent corrosion resistance.

Metal-to-metal seats resist temperature fluctuations.

Bubble-tight soft seats provide a tighter seal than metal-to-metal seats when the valve is completely closed.

Flow coefficient (Cv) is the amount of water (in gallons per minute) at 60° F that will flow through a fully open valve with a difference of 1 psi between the inlet and the outlet.

For technical drawings and 3-D models, click on a part number.

	Gauge Ports
Pipe Size	No. of	Pipe Size	Gender	Thread Type	Flow Coefficient (Cv)	Max. Pressure	End-to-End Lg.	For Use With		Each
Steel Body—Metal-to-Metal Seat
NPT Male × NPT Female
1/2 × 1/2	2	1/2	Female	NPT	0.44	10000 psi @ 200° F	5 3/8"	Oil, Air, Argon, Helium, Krypton, Neon, Xenon	0000000	0000000
3/4 × 1/2	2	1/2	Female	NPT	0.44	10000 psi @ 200° F	5 3/8"	Oil, Air, Argon, Helium, Krypton, Neon, Xenon	0000000	000000
Steel Body—Bubble-Tight Soft Seat
NPT Male × NPT Female
1/2 × 1/2	2	1/2	Female	NPT	0.64	6000 psi @ 200° F	5 3/8"	Air, Argon, Helium, Krypton, Neon, Xenon	0000000	000000
3/4 × 1/2	2	1/2	Female	NPT	0.64	6000 psi @ 200° F	5 3/8"	Air, Argon, Helium, Krypton, Neon, Xenon	0000000	000000
316 Stainless Steel Body—Metal-to-Metal Seat
NPT Male × NPT Female
1/2 × 1/2	2	1/2	Female	NPT	0.44	10000 psi @ 200° F	5 3/8"	Water, Oil, Air, Argon, Helium, Krypton, Neon, Xenon	0000000	000000
3/4 × 1/2	2	1/2	Female	NPT	0.44	10000 psi @ 200° F	5 3/8"	Water, Oil, Air, Argon, Helium, Krypton, Neon, Xenon	0000000	000000
316 Stainless Steel Body—Bubble-Tight Soft Seat
NPT Male × NPT Female
1/2 × 1/2	2	1/2	Female	NPT	0.64	6000 psi @ 200° F	5 3/8"	Water, Air, Argon, Helium, Krypton, Neon, Xenon	0000000	000000
3/4 × 1/2	2	1/2	Female	NPT	0.64	6000 psi @ 200° F	5 3/8"	Water, Air, Argon, Helium, Krypton, Neon, Xenon	0000000	000000

High-Pressure Threaded Precision Flow-Adjustment Valves with Vent Ports

Valve Type: Needle
For Use With: Water, Oil, Air, Argon, Helium, Krypton, Neon, Xenon

Also known as block and bleed valves, these have two vent ports to isolate pressure gauges, switches, and other components in high-pressure systems for maintenance, calibration, and sampling without interrupting the process. Turn the handle to adjust flow in small increments for metering, sampling, and other applications requiring fine flow control. All valves have metal-to-metal seats that resist temperature fluctuations. Body is 316 stainless steel for excellent corrosion resistance. Valves have a nut that can be tightened to compress the packing if it leaks.

Flow coefficient (Cv) is the amount of water (in gallons per minute) at 60° F that will flow through a fully open valve with a difference of 1 psi between the inlet and the outlet.

For technical drawings and 3-D models, click on a part number.

316 Stainless Steel Body
Pipe Size	Flow Coefficient (Cv)	Max. Pressure	Temperature Range, °F	End-to-End Lg.		Each
NPT Female × NPT Female
1/4	0.3	10000 psi @ 265° F	0° to 445°	2 1/2"	0000000	0000000
1/2	0.75	10000 psi @ 265° F	0° to 445°	2 1/2"	0000000	000000

Threaded Isolation On/Off Valves for Chemicals

Valve Type: Ball
For Use With: Acetone, Air, Ammonia, Argon, Carbon Dioxide, Deionized Water, Diesel Fuel, Ethanol, Fuel Oil, Gasoline, Helium, Isopropyl Alcohol, Kerosene, Krypton, Methanol, Neon, Xenon, Xylene
Ball Material: 316 Stainless Steel
Seal Material: PTFE Plastic
Seat Material: PEEK Plastic
Specifications Met: ASME B16.34

Attach gauges or sensors to these valves so you can remove them for maintenance and calibration without depressurizing your line. Also known as block and bleed valves, turn the handles to block both upstream and downstream flow, drain the liquid trapped in the valve through the bleed port, and then remove your instrument from the gauge port. Often used in chemical-processing lines, these valves have a PTFE seal and a corrosion-resistant 316 stainless steel body. All are standard port, so they slightly restrict flow.

Flow coefficient (Cv) is the amount of water (in gallons per minute) at 60° F that will flow through a fully open valve with a difference of 1 psi between the inlet and the outlet.

For technical drawings and 3-D models, click on a part number.

	Gauge Port
Pipe Size	Pipe Size	Gender	Thread Type	Flow Coefficient (Cv)	Max. Pressure	Temperature Range, °F		Each
316 Stainless Steel Body
NPT Female × NPT Female
1/2	1/4	Female	NPT	6.4	10000 psi @ 170° F	-65° to 450°	0000000	0000000