Product Details

  • Allows vacuum pressure to be maintained at user-configured point.
  • Adjustable relief valve is proportional by turning a knurled adjustment screw (not a “Pop” type safety valve).
  • NOTE: Vacuum pump must remain in operation to maintain desired vacuum level.
  • User must calibrate valve by experimenting with chamber under vacuum to determine appropriate valve setting.
  • Not factory set unless specifically requested in sales order.
  • Activation: Pressure Driven.
  • Vacuum Pressure Release Range: 0-27” Hg.
  • Accuracy: Not Rated.
  • Adjustment Method: External Adjustment Screw.
  • Material: Brass.
  • Fitting size: .25” NPT male bottom inlet and vented top outlet.
  • Temperature Range: -15° to 250° F.


Electrical Specifications: None

Weight, Product: 1 Lbs

Weight, Shipping: 2 lb

Package Type: Box

On a tight schedule? Choose FasTrak 24/7 Priority Service to help meet your critical schedule for Terra-manufactured products, either before or after your order is placed.*

  • FasTrak 24/7 provides a 24/7 commitment to meet the shipping date YOU specify, regardless of quoted lead times.
  • FasTrak 24/7 assigns a dedicated production team plus a dedicated senior expeditor working three shifts to meet your delivery specification.
  • FasTrak 24/7 guarantees* to meet the agreed-to specified ship date.

Call for pricing. FasTrak service fees cover costs of additional services only, without additional profit.

 * Terra's FasTrak services limited guarantee: to ship on the ESD or date specified OR to refund up to 100% of FasTrak charges. This guarantee covers no direct, special, consequential or other damages and is strictly limited to up to 100% of the amount paid for FasTrak service. When a specified ship date is missed due to factors outside Terra's control (vendor performance, deliveries by shipping companies, etc.) and random factors such as accidents, the credit of up to 100% of the FasTrak 24/7 may not apply. FasTrak service requested after order placement will be quoted and accepted based on available time remaining before required ship date.