Control Needle Valve VRMM MicroMetering Series 60,000 psi (4140 bar)

 Principle of Operation

MicroMetering valves are designed for applications where more precise control of small flow is required than is possible with a standard regulating stem. Barrel and Thimble micrometer design permits settings to be repeated.
Metering is controlled by a finely tapered stem acting in a precisely mated replaceable seat. Very fine stem position is achieved utilizing a 40 TPI thread. The Barrel and Thimble are calibrated for proper metering at the factory. These valves are designed for metering only and cannot be used as a shutoff valve. Minimum flow is factory set and occurs at “0” position. DO NOT OPERATE THE VALVE BELOW THE ZERO POSITION OR DAMAGE WILL RESULT.
When shutoff action is required, a pressure-matching shutoff valve is recommended.

This is one of Autoclave's latest geniuses. this valve has been tested by ourselves to control a very small flow (chemical) and the control valve manages it wonderfully. We recommend this control valve for very small flow rates.

Ordering Guide

For complete information on available stem types, optional connections and additional valve options, see the Needle Valve Options section or contact your Sales Representative or contact us for further clarification. VRMM Series valves are furnished complete with connection components unless otherwise specified.

A - Valve Series
10VRMM: MicroMetering Valve (Compression Sleeve connection)
15PVRMM: MicroMetering Valve (NPT connection)
30VRMM: MicroMetering Valve, High-Pressure Cone & Thread
60VRMM: MicroMetering Valve, High-Pressure Cone & Thread

B - Outside Diameter Tube/Pipe Size
2:  1/8” (10VRMM only available)
4: 1/4” (15PVRMM & 30VRMM only available)
6: 3/8"

C - Stem/Seal Type
81: Rotating MicroMetering one piece stem with Replaceable Seat

D - Body Pattern
2: Two-Way Angle

E - Options Materials
CSS: N-Dura Coated Stem and Seat
B: Cryogenic Trim material change required when below 0°F
TG: PTFE Glass (25%) Packing to 600°F
GY: Graphite Yarn Packing for Temperatures to 800°F
For extreme temperatures and other options, see Valve Options.

 For more details see tha full PDF table here

Valve Packing Options

Standard Parker Autoclave Engineers 10VRMM, 15PVRMM and 30VRMM Series valves with PTFE packing may be operated to 450°F (232°C). 60VRMM series valves with nylon/leather/nylon packing may be operated from 40ºF (4ºC) to 230ºF (110ºC).

• *TG Standard valve with PTFE glass packing -100° to 600°F (-73° to 316°).
• GY Standard valve with graphite braided yarn packing to 32° to 800°F (0° to 427°).
• B Cryogenic trim materials and PTFE packing required when below 0°F (-18°C) to -100°F (-73°C).

Note: *60VRMM valves with -TG option supplied with PEEK/PTFE Glass/PEEK packing

Parker Autoclave Engineers does not recommend Low Pressure Speedbite sleeve connections below -100°F (-73°C) or above 650°F (343°C). NPT Pipe Connections can be used from -100° to over 400°F (-72 to 204°C) (dependent on sealant temperature range). See needle valve options for stem and seat coating for erosive service.

MicroMetering Valve Features

Barrel and Thimble design permits repeatable settings

•  Barrel divisions every 0.025"
•  25 Thimble divisions, each representing 0.001" stem travel. One revolution = 0.025” stem travel.
•  Operating Temperatures vary per model but can range from -100° to 800°F (-73° to 427°C)
• UNS S31600 cold worked type 316 stainless steel body. Stem and seat are cold-worked type 316 stainless steel.
•  Packing below stem threads is PTFE for the 10VRMM, 15PVRMM and 30VRMM valves and nylon-leather for the 60VRMM. For packing options, see Technical Information Section, or contact to us
• Speedbite “W” Series compression sleeve connections are used on the 10VRMM Series. Operating temperatures are limited from -100° to 650°F
• 1/4" NPT connections (ANPT Aerospace version) are used on 15PVRMM Series. Operating temperatures are limited from -100°F to 400°F
• Parker AE High Pressure Cone & Thread connections are used on both the 30VRMM and 60VRMM Series
• Electric Flow Control Actuators are available for all VRMM Style Valves. See Actuator Section of Catalog for suffix code options.